Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. // Versatile string -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2015 Free Software Foundation, Inc.
  4. //
  5. // This file is part of the GNU ISO C++ Library.  This library is free
  6. // software; you can redistribute it and/or modify it under the
  7. // terms of the GNU General Public License as published by the
  8. // Free Software Foundation; either version 3, or (at your option)
  9. // any later version.
  10.  
  11. // This library is distributed in the hope that it will be useful,
  12. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14. // GNU General Public License for more details.
  15.  
  16. // Under Section 7 of GPL version 3, you are granted additional
  17. // permissions described in the GCC Runtime Library Exception, version
  18. // 3.1, as published by the Free Software Foundation.
  19.  
  20. // You should have received a copy of the GNU General Public License and
  21. // a copy of the GCC Runtime Library Exception along with this program;
  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23. // <http://www.gnu.org/licenses/>.
  24.  
  25. /** @file ext/vstring.h
  26.  *  This file is a GNU extension to the Standard C++ Library.
  27.  */
  28.  
  29. #ifndef _VSTRING_H
  30. #define _VSTRING_H 1
  31.  
  32. #pragma GCC system_header
  33.  
  34. #if __cplusplus >= 201103L
  35. #include <initializer_list>
  36. #endif
  37.  
  38. #include <ext/vstring_util.h>
  39. #include <ext/rc_string_base.h>
  40. #include <ext/sso_string_base.h>
  41.  
  42. namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  43. {
  44. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  45.  
  46.   /**
  47.    *  @class __versa_string vstring.h
  48.    *  @brief  Template class __versa_string.
  49.    *  @ingroup extensions
  50.    *
  51.    *  Data structure managing sequences of characters and
  52.    *  character-like objects.
  53.    */
  54.   template<typename _CharT, typename _Traits, typename _Alloc,
  55.            template <typename, typename, typename> class _Base>
  56.     class __versa_string
  57.     : private _Base<_CharT, _Traits, _Alloc>
  58.     {
  59.       typedef _Base<_CharT, _Traits, _Alloc>                __vstring_base;    
  60.       typedef typename __vstring_base::_CharT_alloc_type    _CharT_alloc_type;
  61.  
  62.       // Types:
  63.     public:
  64.       typedef _Traits                                       traits_type;
  65.       typedef typename _Traits::char_type                   value_type;
  66.       typedef _Alloc                                        allocator_type;
  67.       typedef typename _CharT_alloc_type::size_type         size_type;
  68.       typedef typename _CharT_alloc_type::difference_type   difference_type;
  69.       typedef value_type&                                   reference;
  70.       typedef const value_type&                             const_reference;
  71.       typedef typename _CharT_alloc_type::pointer           pointer;
  72.       typedef typename _CharT_alloc_type::const_pointer     const_pointer;
  73.       typedef __gnu_cxx::__normal_iterator<pointer, __versa_string>  iterator;
  74.       typedef __gnu_cxx::__normal_iterator<const_pointer, __versa_string>
  75.                                                             const_iterator;
  76.       typedef std::reverse_iterator<const_iterator>     const_reverse_iterator;
  77.       typedef std::reverse_iterator<iterator>               reverse_iterator;
  78.  
  79.       // Data Member (public):
  80.       ///  Value returned by various member functions when they fail.
  81.       static const size_type    npos = static_cast<size_type>(-1);
  82.  
  83.     private:
  84.       size_type
  85.       _M_check(size_type __pos, const char* __s) const
  86.       {
  87.         if (__pos > this->size())
  88.           std::__throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
  89.                                             "this->size() (which is %zu)"),
  90.                                         __s, __pos, this->size());
  91.         return __pos;
  92.       }
  93.  
  94.       void
  95.       _M_check_length(size_type __n1, size_type __n2, const char* __s) const
  96.       {
  97.         if (this->max_size() - (this->size() - __n1) < __n2)
  98.           std::__throw_length_error(__N(__s));
  99.       }
  100.  
  101.       // NB: _M_limit doesn't check for a bad __pos value.
  102.       size_type
  103.       _M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT
  104.       {
  105.         const bool __testoff =  __off < this->size() - __pos;
  106.         return __testoff ? __off : this->size() - __pos;
  107.       }
  108.  
  109.       // True if _Rep and source do not overlap.
  110.       bool
  111.       _M_disjunct(const _CharT* __s) const _GLIBCXX_NOEXCEPT
  112.       {
  113.         return (std::less<const _CharT*>()(__s, this->_M_data())
  114.                 || std::less<const _CharT*>()(this->_M_data()
  115.                                               + this->size(), __s));
  116.       }
  117.  
  118.       // For the internal use we have functions similar to `begin'/`end'
  119.       // but they do not call _M_leak.
  120.       iterator
  121.       _M_ibegin() const _GLIBCXX_NOEXCEPT
  122.       { return iterator(this->_M_data()); }
  123.  
  124.       iterator
  125.       _M_iend() const _GLIBCXX_NOEXCEPT
  126.       { return iterator(this->_M_data() + this->_M_length()); }
  127.  
  128.     public:
  129.       // Construct/copy/destroy:
  130.       // NB: We overload ctors in some cases instead of using default
  131.       // arguments, per 17.4.4.4 para. 2 item 2.
  132.  
  133.       /**
  134.        *  @brief  Construct an empty string using allocator @a a.
  135.        */
  136.       explicit
  137.       __versa_string(const _Alloc& __a = _Alloc()) _GLIBCXX_NOEXCEPT
  138.       : __vstring_base(__a) { }
  139.  
  140.       // NB: per LWG issue 42, semantics different from IS:
  141.       /**
  142.        *  @brief  Construct string with copy of value of @a __str.
  143.        *  @param  __str  Source string.
  144.        */
  145.       __versa_string(const __versa_string& __str)
  146.       : __vstring_base(__str) { }
  147.  
  148. #if __cplusplus >= 201103L
  149.       /**
  150.        *  @brief  String move constructor.
  151.        *  @param  __str  Source string.
  152.        *
  153.        *  The newly-constructed %string contains the exact contents of
  154.        *  @a __str.  The contents of @a __str are a valid, but unspecified
  155.        *  string.
  156.        */
  157.       __versa_string(__versa_string&& __str) noexcept
  158.       : __vstring_base(std::move(__str)) { }
  159.  
  160.       /**
  161.        *  @brief  Construct string from an initializer list.
  162.        *  @param  __l  std::initializer_list of characters.
  163.        *  @param  __a  Allocator to use (default is default allocator).
  164.        */
  165.       __versa_string(std::initializer_list<_CharT> __l,
  166.                      const _Alloc& __a = _Alloc())
  167.       : __vstring_base(__l.begin(), __l.end(), __a) { }
  168. #endif
  169.  
  170.       /**
  171.        *  @brief  Construct string as copy of a substring.
  172.        *  @param  __str  Source string.
  173.        *  @param  __pos  Index of first character to copy from.
  174.        *  @param  __n  Number of characters to copy (default remainder).
  175.        */
  176.       __versa_string(const __versa_string& __str, size_type __pos,
  177.                      size_type __n = npos)
  178.       : __vstring_base(__str._M_data()
  179.                        + __str._M_check(__pos,
  180.                                         "__versa_string::__versa_string"),
  181.                        __str._M_data() + __str._M_limit(__pos, __n)
  182.                        + __pos, _Alloc()) { }
  183.  
  184.       /**
  185.        *  @brief  Construct string as copy of a substring.
  186.        *  @param  __str  Source string.
  187.        *  @param  __pos  Index of first character to copy from.
  188.        *  @param  __n  Number of characters to copy.
  189.        *  @param  __a  Allocator to use.
  190.        */
  191.       __versa_string(const __versa_string& __str, size_type __pos,
  192.                      size_type __n, const _Alloc& __a)
  193.       : __vstring_base(__str._M_data()
  194.                        + __str._M_check(__pos,
  195.                                         "__versa_string::__versa_string"),
  196.                        __str._M_data() + __str._M_limit(__pos, __n)
  197.                        + __pos, __a) { }
  198.  
  199.       /**
  200.        *  @brief  Construct string initialized by a character array.
  201.        *  @param  __s  Source character array.
  202.        *  @param  __n  Number of characters to copy.
  203.        *  @param  __a  Allocator to use (default is default allocator).
  204.        *
  205.        *  NB: @a __s must have at least @a __n characters, '\\0' has no special
  206.        *  meaning.
  207.        */
  208.       __versa_string(const _CharT* __s, size_type __n,
  209.                      const _Alloc& __a = _Alloc())
  210.       : __vstring_base(__s, __s + __n, __a) { }
  211.  
  212.       /**
  213.        *  @brief  Construct string as copy of a C string.
  214.        *  @param  __s  Source C string.
  215.        *  @param  __a  Allocator to use (default is default allocator).
  216.        */
  217.       __versa_string(const _CharT* __s, const _Alloc& __a = _Alloc())
  218.       : __vstring_base(__s, __s ? __s + traits_type::length(__s) :
  219.                        __s + npos, __a) { }
  220.  
  221.       /**
  222.        *  @brief  Construct string as multiple characters.
  223.        *  @param  __n  Number of characters.
  224.        *  @param  __c  Character to use.
  225.        *  @param  __a  Allocator to use (default is default allocator).
  226.        */
  227.       __versa_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
  228.       : __vstring_base(__n, __c, __a) { }
  229.  
  230.       /**
  231.        *  @brief  Construct string as copy of a range.
  232.        *  @param  __beg  Start of range.
  233.        *  @param  __end  End of range.
  234.        *  @param  __a  Allocator to use (default is default allocator).
  235.        */
  236. #if __cplusplus >= 201103L
  237.       template<class _InputIterator,
  238.                typename = std::_RequireInputIter<_InputIterator>>
  239. #else
  240.       template<class _InputIterator>
  241. #endif
  242.         __versa_string(_InputIterator __beg, _InputIterator __end,
  243.                        const _Alloc& __a = _Alloc())
  244.         : __vstring_base(__beg, __end, __a) { }
  245.  
  246.       /**
  247.        *  @brief  Destroy the string instance.
  248.        */
  249.       ~__versa_string() _GLIBCXX_NOEXCEPT { }  
  250.  
  251.       /**
  252.        *  @brief  Assign the value of @a str to this string.
  253.        *  @param  __str  Source string.
  254.        */
  255.       __versa_string&
  256.       operator=(const __versa_string& __str)
  257.       { return this->assign(__str); }
  258.  
  259. #if __cplusplus >= 201103L
  260.       /**
  261.        *  @brief  String move assignment operator.
  262.        *  @param  __str  Source string.
  263.        *
  264.        *  The contents of @a __str are moved into this string (without
  265.        *  copying).  @a __str is a valid, but unspecified string.
  266.        */
  267.       __versa_string&
  268.       operator=(__versa_string&& __str) noexcept
  269.       {
  270.         // NB: DR 1204.
  271.         this->swap(__str);
  272.         return *this;
  273.       }
  274.  
  275.       /**
  276.        *  @brief  Set value to string constructed from initializer list.
  277.        *  @param  __l  std::initializer_list.
  278.        */
  279.       __versa_string&
  280.       operator=(std::initializer_list<_CharT> __l)
  281.       {
  282.         this->assign(__l.begin(), __l.end());
  283.         return *this;
  284.       }
  285. #endif
  286.  
  287.       /**
  288.        *  @brief  Copy contents of @a __s into this string.
  289.        *  @param  __s  Source null-terminated string.
  290.        */
  291.       __versa_string&
  292.       operator=(const _CharT* __s)
  293.       { return this->assign(__s); }
  294.  
  295.       /**
  296.        *  @brief  Set value to string of length 1.
  297.        *  @param  __c  Source character.
  298.        *
  299.        *  Assigning to a character makes this string length 1 and
  300.        *  (*this)[0] == @a __c.
  301.        */
  302.       __versa_string&
  303.       operator=(_CharT __c)
  304.       {
  305.         this->assign(1, __c);
  306.         return *this;
  307.       }
  308.  
  309.       // Iterators:
  310.       /**
  311.        *  Returns a read/write iterator that points to the first character in
  312.        *  the %string.  Unshares the string.
  313.        */
  314.       iterator
  315.       begin() _GLIBCXX_NOEXCEPT
  316.       {
  317.         this->_M_leak();
  318.         return iterator(this->_M_data());
  319.       }
  320.  
  321.       /**
  322.        *  Returns a read-only (constant) iterator that points to the first
  323.        *  character in the %string.
  324.        */
  325.       const_iterator
  326.       begin() const _GLIBCXX_NOEXCEPT
  327.       { return const_iterator(this->_M_data()); }
  328.  
  329.       /**
  330.        *  Returns a read/write iterator that points one past the last
  331.        *  character in the %string.  Unshares the string.
  332.        */
  333.       iterator
  334.       end() _GLIBCXX_NOEXCEPT
  335.       {
  336.         this->_M_leak();
  337.         return iterator(this->_M_data() + this->size());
  338.       }
  339.  
  340.       /**
  341.        *  Returns a read-only (constant) iterator that points one past the
  342.        *  last character in the %string.
  343.        */
  344.       const_iterator
  345.       end() const _GLIBCXX_NOEXCEPT
  346.       { return const_iterator(this->_M_data() + this->size()); }
  347.  
  348.       /**
  349.        *  Returns a read/write reverse iterator that points to the last
  350.        *  character in the %string.  Iteration is done in reverse element
  351.        *  order.  Unshares the string.
  352.        */
  353.       reverse_iterator
  354.       rbegin() _GLIBCXX_NOEXCEPT
  355.       { return reverse_iterator(this->end()); }
  356.  
  357.       /**
  358.        *  Returns a read-only (constant) reverse iterator that points
  359.        *  to the last character in the %string.  Iteration is done in
  360.        *  reverse element order.
  361.        */
  362.       const_reverse_iterator
  363.       rbegin() const _GLIBCXX_NOEXCEPT
  364.       { return const_reverse_iterator(this->end()); }
  365.  
  366.       /**
  367.        *  Returns a read/write reverse iterator that points to one before the
  368.        *  first character in the %string.  Iteration is done in reverse
  369.        *  element order.  Unshares the string.
  370.        */
  371.       reverse_iterator
  372.       rend() _GLIBCXX_NOEXCEPT
  373.       { return reverse_iterator(this->begin()); }
  374.  
  375.       /**
  376.        *  Returns a read-only (constant) reverse iterator that points
  377.        *  to one before the first character in the %string.  Iteration
  378.        *  is done in reverse element order.
  379.        */
  380.       const_reverse_iterator
  381.       rend() const _GLIBCXX_NOEXCEPT
  382.       { return const_reverse_iterator(this->begin()); }
  383.  
  384. #if __cplusplus >= 201103L
  385.       /**
  386.        *  Returns a read-only (constant) iterator that points to the first
  387.        *  character in the %string.
  388.        */
  389.       const_iterator
  390.       cbegin() const noexcept
  391.       { return const_iterator(this->_M_data()); }
  392.  
  393.       /**
  394.        *  Returns a read-only (constant) iterator that points one past the
  395.        *  last character in the %string.
  396.        */
  397.       const_iterator
  398.       cend() const noexcept
  399.       { return const_iterator(this->_M_data() + this->size()); }
  400.  
  401.       /**
  402.        *  Returns a read-only (constant) reverse iterator that points
  403.        *  to the last character in the %string.  Iteration is done in
  404.        *  reverse element order.
  405.        */
  406.       const_reverse_iterator
  407.       crbegin() const noexcept
  408.       { return const_reverse_iterator(this->end()); }
  409.  
  410.       /**
  411.        *  Returns a read-only (constant) reverse iterator that points
  412.        *  to one before the first character in the %string.  Iteration
  413.        *  is done in reverse element order.
  414.        */
  415.       const_reverse_iterator
  416.       crend() const noexcept
  417.       { return const_reverse_iterator(this->begin()); }
  418. #endif
  419.  
  420.     public:
  421.       // Capacity:
  422.       ///  Returns the number of characters in the string, not including any
  423.       ///  null-termination.
  424.       size_type
  425.       size() const _GLIBCXX_NOEXCEPT
  426.       { return this->_M_length(); }
  427.  
  428.       ///  Returns the number of characters in the string, not including any
  429.       ///  null-termination.
  430.       size_type
  431.       length() const _GLIBCXX_NOEXCEPT
  432.       { return this->_M_length(); }
  433.  
  434.       /// Returns the size() of the largest possible %string.
  435.       size_type
  436.       max_size() const _GLIBCXX_NOEXCEPT
  437.       { return this->_M_max_size(); }
  438.  
  439.       /**
  440.        *  @brief  Resizes the %string to the specified number of characters.
  441.        *  @param  __n  Number of characters the %string should contain.
  442.        *  @param  __c  Character to fill any new elements.
  443.        *
  444.        *  This function will %resize the %string to the specified
  445.        *  number of characters.  If the number is smaller than the
  446.        *  %string's current size the %string is truncated, otherwise
  447.        *  the %string is extended and new elements are set to @a __c.
  448.        */
  449.       void
  450.       resize(size_type __n, _CharT __c);
  451.  
  452.       /**
  453.        *  @brief  Resizes the %string to the specified number of characters.
  454.        *  @param  __n  Number of characters the %string should contain.
  455.        *
  456.        *  This function will resize the %string to the specified
  457.        *  length.  If the new size is smaller than the %string's
  458.        *  current size the %string is truncated, otherwise the %string
  459.        *  is extended and new characters are default-constructed.  For
  460.        *  basic types such as char, this means setting them to 0.
  461.        */
  462.       void
  463.       resize(size_type __n)
  464.       { this->resize(__n, _CharT()); }
  465.  
  466. #if __cplusplus >= 201103L
  467.       /// A non-binding request to reduce capacity() to size().
  468.       void
  469.       shrink_to_fit() noexcept
  470.       {
  471.         if (capacity() > size())
  472.           {
  473.             __try
  474.               { this->reserve(0); }
  475.             __catch(...)
  476.               { }
  477.           }
  478.       }
  479. #endif
  480.  
  481.       /**
  482.        *  Returns the total number of characters that the %string can
  483.        *  hold before needing to allocate more memory.
  484.        */
  485.       size_type
  486.       capacity() const _GLIBCXX_NOEXCEPT
  487.       { return this->_M_capacity(); }
  488.  
  489.       /**
  490.        *  @brief  Attempt to preallocate enough memory for specified number of
  491.        *          characters.
  492.        *  @param  __res_arg  Number of characters required.
  493.        *  @throw  std::length_error  If @a __res_arg exceeds @c max_size().
  494.        *
  495.        *  This function attempts to reserve enough memory for the
  496.        *  %string to hold the specified number of characters.  If the
  497.        *  number requested is more than max_size(), length_error is
  498.        *  thrown.
  499.        *
  500.        *  The advantage of this function is that if optimal code is a
  501.        *  necessity and the user can determine the string length that
  502.        *  will be required, the user can reserve the memory in
  503.        *  %advance, and thus prevent a possible reallocation of memory
  504.        *  and copying of %string data.
  505.        */
  506.       void
  507.       reserve(size_type __res_arg = 0)
  508.       { this->_M_reserve(__res_arg); }
  509.  
  510.       /**
  511.        *  Erases the string, making it empty.
  512.        */
  513.       void
  514.       clear() _GLIBCXX_NOEXCEPT
  515.       { this->_M_clear(); }
  516.  
  517.       /**
  518.        *  Returns true if the %string is empty.  Equivalent to
  519.        *  <code>*this == ""</code>.
  520.        */
  521.       bool
  522.       empty() const _GLIBCXX_NOEXCEPT
  523.       { return this->size() == 0; }
  524.  
  525.       // Element access:
  526.       /**
  527.        *  @brief  Subscript access to the data contained in the %string.
  528.        *  @param  __pos  The index of the character to access.
  529.        *  @return  Read-only (constant) reference to the character.
  530.        *
  531.        *  This operator allows for easy, array-style, data access.
  532.        *  Note that data access with this operator is unchecked and
  533.        *  out_of_range lookups are not defined. (For checked lookups
  534.        *  see at().)
  535.        */
  536.       const_reference
  537.       operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT
  538.       {
  539.         _GLIBCXX_DEBUG_ASSERT(__pos <= this->size());
  540.         return this->_M_data()[__pos];
  541.       }
  542.  
  543.       /**
  544.        *  @brief  Subscript access to the data contained in the %string.
  545.        *  @param  __pos  The index of the character to access.
  546.        *  @return  Read/write reference to the character.
  547.        *
  548.        *  This operator allows for easy, array-style, data access.
  549.        *  Note that data access with this operator is unchecked and
  550.        *  out_of_range lookups are not defined. (For checked lookups
  551.        *  see at().)  Unshares the string.
  552.        */
  553.       reference
  554.       operator[](size_type __pos) _GLIBCXX_NOEXCEPT
  555.       {
  556.         // Allow pos == size() both in C++98 mode, as v3 extension,
  557.         // and in C++11 mode.
  558.         _GLIBCXX_DEBUG_ASSERT(__pos <= this->size());
  559.         // In pedantic mode be strict in C++98 mode.
  560.         _GLIBCXX_DEBUG_PEDASSERT(__cplusplus >= 201103L
  561.                                  || __pos < this->size());
  562.         this->_M_leak();
  563.         return this->_M_data()[__pos];
  564.       }
  565.  
  566.       /**
  567.        *  @brief  Provides access to the data contained in the %string.
  568.        *  @param __n The index of the character to access.
  569.        *  @return  Read-only (const) reference to the character.
  570.        *  @throw  std::out_of_range  If @a __n is an invalid index.
  571.        *
  572.        *  This function provides for safer data access.  The parameter
  573.        *  is first checked that it is in the range of the string.  The
  574.        *  function throws out_of_range if the check fails.
  575.        */
  576.       const_reference
  577.       at(size_type __n) const
  578.       {
  579.         if (__n >= this->size())
  580.           std::__throw_out_of_range_fmt(__N("__versa_string::at: __n "
  581.                                             "(which is %zu) >= this->size() "
  582.                                             "(which is %zu)"),
  583.                                         __n, this->size());
  584.         return this->_M_data()[__n];
  585.       }
  586.  
  587.       /**
  588.        *  @brief  Provides access to the data contained in the %string.
  589.        *  @param __n The index of the character to access.
  590.        *  @return  Read/write reference to the character.
  591.        *  @throw  std::out_of_range  If @a __n is an invalid index.
  592.        *
  593.        *  This function provides for safer data access.  The parameter
  594.        *  is first checked that it is in the range of the string.  The
  595.        *  function throws out_of_range if the check fails.  Success
  596.        *  results in unsharing the string.
  597.        */
  598.       reference
  599.       at(size_type __n)
  600.       {
  601.         if (__n >= this->size())
  602.           std::__throw_out_of_range_fmt(__N("__versa_string::at: __n "
  603.                                             "(which is %zu) >= this->size() "
  604.                                             "(which is %zu)"),
  605.                                         __n, this->size());
  606.         this->_M_leak();
  607.         return this->_M_data()[__n];
  608.       }
  609.  
  610. #if __cplusplus >= 201103L
  611.       /**
  612.        *  Returns a read/write reference to the data at the first
  613.        *  element of the %string.
  614.        */
  615.       reference
  616.       front() _GLIBCXX_NOEXCEPT
  617.       { return operator[](0); }
  618.  
  619.       /**
  620.        *  Returns a read-only (constant) reference to the data at the first
  621.        *  element of the %string.
  622.        */
  623.       const_reference
  624.       front() const _GLIBCXX_NOEXCEPT
  625.       { return operator[](0); }
  626.  
  627.       /**
  628.        *  Returns a read/write reference to the data at the last
  629.        *  element of the %string.
  630.        */
  631.       reference
  632.       back() _GLIBCXX_NOEXCEPT
  633.       { return operator[](this->size() - 1); }
  634.  
  635.       /**
  636.        *  Returns a read-only (constant) reference to the data at the
  637.        *  last element of the %string.
  638.        */
  639.       const_reference
  640.       back() const _GLIBCXX_NOEXCEPT
  641.       { return operator[](this->size() - 1); }
  642. #endif
  643.  
  644.       // Modifiers:
  645.       /**
  646.        *  @brief  Append a string to this string.
  647.        *  @param __str  The string to append.
  648.        *  @return  Reference to this string.
  649.        */
  650.       __versa_string&
  651.       operator+=(const __versa_string& __str)
  652.       { return this->append(__str); }
  653.  
  654.       /**
  655.        *  @brief  Append a C string.
  656.        *  @param __s  The C string to append.
  657.        *  @return  Reference to this string.
  658.        */
  659.       __versa_string&
  660.       operator+=(const _CharT* __s)
  661.       { return this->append(__s); }
  662.  
  663.       /**
  664.        *  @brief  Append a character.
  665.        *  @param __c  The character to append.
  666.        *  @return  Reference to this string.
  667.        */
  668.       __versa_string&
  669.       operator+=(_CharT __c)
  670.       {
  671.         this->push_back(__c);
  672.         return *this;
  673.       }
  674.  
  675. #if __cplusplus >= 201103L
  676.       /**
  677.        *  @brief  Append an initializer_list of characters.
  678.        *  @param __l  The initializer_list of characters to be appended.
  679.        *  @return  Reference to this string.
  680.        */
  681.       __versa_string&
  682.       operator+=(std::initializer_list<_CharT> __l)
  683.       { return this->append(__l.begin(), __l.end()); }
  684. #endif // C++11
  685.  
  686.       /**
  687.        *  @brief  Append a string to this string.
  688.        *  @param __str  The string to append.
  689.        *  @return  Reference to this string.
  690.        */
  691.       __versa_string&
  692.       append(const __versa_string& __str)
  693.       { return _M_append(__str._M_data(), __str.size()); }
  694.  
  695.       /**
  696.        *  @brief  Append a substring.
  697.        *  @param __str  The string to append.
  698.        *  @param __pos  Index of the first character of str to append.
  699.        *  @param __n  The number of characters to append.
  700.        *  @return  Reference to this string.
  701.        *  @throw  std::out_of_range if @a pos is not a valid index.
  702.        *
  703.        *  This function appends @a __n characters from @a __str
  704.        *  starting at @a __pos to this string.  If @a __n is is larger
  705.        *  than the number of available characters in @a __str, the
  706.        *  remainder of @a __str is appended.
  707.        */
  708.       __versa_string&
  709.       append(const __versa_string& __str, size_type __pos, size_type __n)
  710.       { return _M_append(__str._M_data()
  711.                          + __str._M_check(__pos, "__versa_string::append"),
  712.                          __str._M_limit(__pos, __n)); }
  713.  
  714.       /**
  715.        *  @brief  Append a C substring.
  716.        *  @param __s  The C string to append.
  717.        *  @param __n  The number of characters to append.
  718.        *  @return  Reference to this string.
  719.        */
  720.       __versa_string&
  721.       append(const _CharT* __s, size_type __n)
  722.       {
  723.         __glibcxx_requires_string_len(__s, __n);
  724.         _M_check_length(size_type(0), __n, "__versa_string::append");
  725.         return _M_append(__s, __n);
  726.       }
  727.  
  728.       /**
  729.        *  @brief  Append a C string.
  730.        *  @param __s  The C string to append.
  731.        *  @return  Reference to this string.
  732.        */
  733.       __versa_string&
  734.       append(const _CharT* __s)
  735.       {
  736.         __glibcxx_requires_string(__s);
  737.         const size_type __n = traits_type::length(__s);
  738.         _M_check_length(size_type(0), __n, "__versa_string::append");
  739.         return _M_append(__s, __n);
  740.       }
  741.  
  742.       /**
  743.        *  @brief  Append multiple characters.
  744.        *  @param __n  The number of characters to append.
  745.        *  @param __c  The character to use.
  746.        *  @return  Reference to this string.
  747.        *
  748.        *  Appends n copies of c to this string.
  749.        */
  750.       __versa_string&
  751.       append(size_type __n, _CharT __c)
  752.       { return _M_replace_aux(this->size(), size_type(0), __n, __c); }
  753.  
  754. #if __cplusplus >= 201103L
  755.       /**
  756.        *  @brief  Append an initializer_list of characters.
  757.        *  @param __l  The initializer_list of characters to append.
  758.        *  @return  Reference to this string.
  759.        */
  760.       __versa_string&
  761.       append(std::initializer_list<_CharT> __l)
  762.       { return this->append(__l.begin(), __l.end()); }
  763. #endif // C++11
  764.  
  765.       /**
  766.        *  @brief  Append a range of characters.
  767.        *  @param __first  Iterator referencing the first character to append.
  768.        *  @param __last  Iterator marking the end of the range.
  769.        *  @return  Reference to this string.
  770.        *
  771.        *  Appends characters in the range [first,last) to this string.
  772.        */
  773. #if __cplusplus >= 201103L
  774.       template<class _InputIterator,
  775.                typename = std::_RequireInputIter<_InputIterator>>
  776. #else
  777.       template<class _InputIterator>
  778. #endif
  779.         __versa_string&
  780.         append(_InputIterator __first, _InputIterator __last)
  781.         { return this->replace(_M_iend(), _M_iend(), __first, __last); }
  782.  
  783.       /**
  784.        *  @brief  Append a single character.
  785.        *  @param __c  Character to append.
  786.        */
  787.       void
  788.       push_back(_CharT __c)
  789.       {
  790.         const size_type __size = this->size();
  791.         if (__size + 1 > this->capacity() || this->_M_is_shared())
  792.           this->_M_mutate(__size, size_type(0), 0, size_type(1));
  793.         traits_type::assign(this->_M_data()[__size], __c);
  794.         this->_M_set_length(__size + 1);
  795.       }
  796.  
  797.       /**
  798.        *  @brief  Set value to contents of another string.
  799.        *  @param  __str  Source string to use.
  800.        *  @return  Reference to this string.
  801.        */
  802.       __versa_string&
  803.       assign(const __versa_string& __str)
  804.       {
  805.         this->_M_assign(__str);
  806.         return *this;
  807.       }
  808.  
  809. #if __cplusplus >= 201103L
  810.       /**
  811.        *  @brief  Set value to contents of another string.
  812.        *  @param  __str  Source string to use.
  813.        *  @return  Reference to this string.
  814.        *
  815.        *  This function sets this string to the exact contents of @a __str.
  816.        *  @a __str is a valid, but unspecified string.
  817.        */
  818.       __versa_string&
  819.       assign(__versa_string&& __str) noexcept
  820.       {
  821.         this->swap(__str);
  822.         return *this;
  823.       }
  824. #endif // C++11
  825.  
  826.       /**
  827.        *  @brief  Set value to a substring of a string.
  828.        *  @param __str  The string to use.
  829.        *  @param __pos  Index of the first character of str.
  830.        *  @param __n  Number of characters to use.
  831.        *  @return  Reference to this string.
  832.        *  @throw  std::out_of_range if @a __pos is not a valid index.
  833.        *
  834.        *  This function sets this string to the substring of @a __str
  835.        *  consisting of @a __n characters at @a __pos.  If @a __n is
  836.        *  is larger than the number of available characters in @a
  837.        *  __str, the remainder of @a __str is used.
  838.        */
  839.       __versa_string&
  840.       assign(const __versa_string& __str, size_type __pos, size_type __n)
  841.       { return _M_replace(size_type(0), this->size(), __str._M_data()
  842.                           + __str._M_check(__pos, "__versa_string::assign"),
  843.                           __str._M_limit(__pos, __n)); }
  844.  
  845.       /**
  846.        *  @brief  Set value to a C substring.
  847.        *  @param __s  The C string to use.
  848.        *  @param __n  Number of characters to use.
  849.        *  @return  Reference to this string.
  850.        *
  851.        *  This function sets the value of this string to the first @a
  852.        *  __n characters of @a __s.  If @a __n is is larger than the
  853.        *  number of available characters in @a __s, the remainder of
  854.        *  @a __s is used.
  855.        */
  856.       __versa_string&
  857.       assign(const _CharT* __s, size_type __n)
  858.       {
  859.         __glibcxx_requires_string_len(__s, __n);
  860.         return _M_replace(size_type(0), this->size(), __s, __n);
  861.       }
  862.  
  863.       /**
  864.        *  @brief  Set value to contents of a C string.
  865.        *  @param __s  The C string to use.
  866.        *  @return  Reference to this string.
  867.        *
  868.        *  This function sets the value of this string to the value of
  869.        *  @a __s.  The data is copied, so there is no dependence on @a
  870.        *  __s once the function returns.
  871.        */
  872.       __versa_string&
  873.       assign(const _CharT* __s)
  874.       {
  875.         __glibcxx_requires_string(__s);
  876.         return _M_replace(size_type(0), this->size(), __s,
  877.                           traits_type::length(__s));
  878.       }
  879.  
  880.       /**
  881.        *  @brief  Set value to multiple characters.
  882.        *  @param __n  Length of the resulting string.
  883.        *  @param __c  The character to use.
  884.        *  @return  Reference to this string.
  885.        *
  886.        *  This function sets the value of this string to @a __n copies of
  887.        *  character @a __c.
  888.        */
  889.       __versa_string&
  890.       assign(size_type __n, _CharT __c)
  891.       { return _M_replace_aux(size_type(0), this->size(), __n, __c); }
  892.  
  893.       /**
  894.        *  @brief  Set value to a range of characters.
  895.        *  @param __first  Iterator referencing the first character to append.
  896.        *  @param __last  Iterator marking the end of the range.
  897.        *  @return  Reference to this string.
  898.        *
  899.        *  Sets value of string to characters in the range
  900.        *  [first,last).
  901.       */
  902. #if __cplusplus >= 201103L
  903.       template<class _InputIterator,
  904.                typename = std::_RequireInputIter<_InputIterator>>
  905. #else
  906.       template<class _InputIterator>
  907. #endif
  908.         __versa_string&
  909.         assign(_InputIterator __first, _InputIterator __last)
  910.         { return this->replace(_M_ibegin(), _M_iend(), __first, __last); }
  911.  
  912. #if __cplusplus >= 201103L
  913.       /**
  914.        *  @brief  Set value to an initializer_list of characters.
  915.        *  @param __l  The initializer_list of characters to assign.
  916.        *  @return  Reference to this string.
  917.        */
  918.       __versa_string&
  919.       assign(std::initializer_list<_CharT> __l)
  920.       { return this->assign(__l.begin(), __l.end()); }
  921. #endif // C++11
  922.  
  923. #if __cplusplus >= 201103L
  924.       /**
  925.        *  @brief  Insert multiple characters.
  926.        *  @param __p  Const_iterator referencing location in string to
  927.        *              insert at.
  928.        *  @param __n  Number of characters to insert
  929.        *  @param __c  The character to insert.
  930.        *  @return  Iterator referencing the first inserted char.
  931.        *  @throw  std::length_error  If new length exceeds @c max_size().
  932.        *
  933.        *  Inserts @a __n copies of character @a __c starting at the
  934.        *  position referenced by iterator @a __p.  If adding
  935.        *  characters causes the length to exceed max_size(),
  936.        *  length_error is thrown.  The value of the string doesn't
  937.        *  change if an error is thrown.
  938.       */
  939.       iterator
  940.       insert(const_iterator __p, size_type __n, _CharT __c)
  941.       {
  942.         _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend());
  943.         const size_type __pos = __p - _M_ibegin();
  944.         this->replace(__p, __p, __n, __c);
  945.         return iterator(this->_M_data() + __pos);
  946.       }
  947. #else
  948.       /**
  949.        *  @brief  Insert multiple characters.
  950.        *  @param __p  Iterator referencing location in string to insert at.
  951.        *  @param __n  Number of characters to insert
  952.        *  @param __c  The character to insert.
  953.        *  @throw  std::length_error  If new length exceeds @c max_size().
  954.        *
  955.        *  Inserts @a __n copies of character @a __c starting at the
  956.        *  position referenced by iterator @a __p.  If adding
  957.        *  characters causes the length to exceed max_size(),
  958.        *  length_error is thrown.  The value of the string doesn't
  959.        *  change if an error is thrown.
  960.       */
  961.       void
  962.       insert(iterator __p, size_type __n, _CharT __c)
  963.       { this->replace(__p, __p, __n, __c);  }
  964. #endif
  965.  
  966. #if __cplusplus >= 201103L
  967.       /**
  968.        *  @brief  Insert a range of characters.
  969.        *  @param __p  Const_iterator referencing location in string to
  970.        *              insert at.
  971.        *  @param __beg  Start of range.
  972.        *  @param __end  End of range.
  973.        *  @return  Iterator referencing the first inserted char.
  974.        *  @throw  std::length_error  If new length exceeds @c max_size().
  975.        *
  976.        *  Inserts characters in range [beg,end).  If adding characters
  977.        *  causes the length to exceed max_size(), length_error is
  978.        *  thrown.  The value of the string doesn't change if an error
  979.        *  is thrown.
  980.       */
  981.       template<class _InputIterator,
  982.                typename = std::_RequireInputIter<_InputIterator>>
  983.         iterator
  984.         insert(const_iterator __p, _InputIterator __beg, _InputIterator __end)
  985.         {
  986.           _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend());
  987.           const size_type __pos = __p - _M_ibegin();
  988.           this->replace(__p, __p, __beg, __end);
  989.           return iterator(this->_M_data() + __pos);
  990.         }
  991. #else
  992.       /**
  993.        *  @brief  Insert a range of characters.
  994.        *  @param __p  Iterator referencing location in string to insert at.
  995.        *  @param __beg  Start of range.
  996.        *  @param __end  End of range.
  997.        *  @throw  std::length_error  If new length exceeds @c max_size().
  998.        *
  999.        *  Inserts characters in range [beg,end).  If adding characters
  1000.        *  causes the length to exceed max_size(), length_error is
  1001.        *  thrown.  The value of the string doesn't change if an error
  1002.        *  is thrown.
  1003.       */
  1004.       template<class _InputIterator>
  1005.         void
  1006.         insert(iterator __p, _InputIterator __beg, _InputIterator __end)
  1007.         { this->replace(__p, __p, __beg, __end); }
  1008. #endif
  1009.  
  1010. #if __cplusplus >= 201103L
  1011.       /**
  1012.        *  @brief  Insert an initializer_list of characters.
  1013.        *  @param __p  Const_iterator referencing location in string to
  1014.        *              insert at.
  1015.        *  @param __l  The initializer_list of characters to insert.
  1016.        *  @return  Iterator referencing the first inserted char.
  1017.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1018.        */
  1019.       iterator
  1020.       insert(const_iterator __p, std::initializer_list<_CharT> __l)
  1021.       { return this->insert(__p, __l.begin(), __l.end()); }
  1022. #endif // C++11
  1023.  
  1024.       /**
  1025.        *  @brief  Insert value of a string.
  1026.        *  @param __pos1  Iterator referencing location in string to insert at.
  1027.        *  @param __str  The string to insert.
  1028.        *  @return  Reference to this string.
  1029.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1030.        *
  1031.        *  Inserts value of @a __str starting at @a __pos1.  If adding
  1032.        *  characters causes the length to exceed max_size(),
  1033.        *  length_error is thrown.  The value of the string doesn't
  1034.        *  change if an error is thrown.
  1035.       */
  1036.       __versa_string&
  1037.       insert(size_type __pos1, const __versa_string& __str)
  1038.       { return this->replace(__pos1, size_type(0),
  1039.                              __str._M_data(), __str.size()); }
  1040.  
  1041.       /**
  1042.        *  @brief  Insert a substring.
  1043.        *  @param __pos1  Iterator referencing location in string to insert at.
  1044.        *  @param __str  The string to insert.
  1045.        *  @param __pos2  Start of characters in str to insert.
  1046.        *  @param __n  Number of characters to insert.
  1047.        *  @return  Reference to this string.
  1048.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1049.        *  @throw  std::out_of_range  If @a __pos1 > size() or
  1050.        *  @a __pos2 > @a __str.size().
  1051.        *
  1052.        *  Starting at @a __pos1, insert @a __n character of @a __str
  1053.        *  beginning with @a __pos2.  If adding characters causes the
  1054.        *  length to exceed max_size(), length_error is thrown.  If @a
  1055.        *  __pos1 is beyond the end of this string or @a __pos2 is
  1056.        *  beyond the end of @a __str, out_of_range is thrown.  The
  1057.        *  value of the string doesn't change if an error is thrown.
  1058.       */
  1059.       __versa_string&
  1060.       insert(size_type __pos1, const __versa_string& __str,
  1061.              size_type __pos2, size_type __n)
  1062.       { return this->replace(__pos1, size_type(0), __str._M_data()
  1063.                              + __str._M_check(__pos2, "__versa_string::insert"),
  1064.                              __str._M_limit(__pos2, __n)); }
  1065.  
  1066.       /**
  1067.        *  @brief  Insert a C substring.
  1068.        *  @param __pos  Iterator referencing location in string to insert at.
  1069.        *  @param __s  The C string to insert.
  1070.        *  @param __n  The number of characters to insert.
  1071.        *  @return  Reference to this string.
  1072.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1073.        *  @throw  std::out_of_range  If @a __pos is beyond the end of this
  1074.        *  string.
  1075.        *
  1076.        *  Inserts the first @a __n characters of @a __s starting at @a
  1077.        *  __pos.  If adding characters causes the length to exceed
  1078.        *  max_size(), length_error is thrown.  If @a __pos is beyond
  1079.        *  end(), out_of_range is thrown.  The value of the string
  1080.        *  doesn't change if an error is thrown.
  1081.       */
  1082.       __versa_string&
  1083.       insert(size_type __pos, const _CharT* __s, size_type __n)
  1084.       { return this->replace(__pos, size_type(0), __s, __n); }
  1085.  
  1086.       /**
  1087.        *  @brief  Insert a C string.
  1088.        *  @param __pos  Iterator referencing location in string to insert at.
  1089.        *  @param __s  The C string to insert.
  1090.        *  @return  Reference to this string.
  1091.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1092.        *  @throw  std::out_of_range  If @a __pos is beyond the end of this
  1093.        *  string.
  1094.        *
  1095.        *  Inserts the first @a __n characters of @a __s starting at @a
  1096.        *  __pos.  If adding characters causes the length to exceed
  1097.        *  max_size(), length_error is thrown.  If @a __pos is beyond
  1098.        *  end(), out_of_range is thrown.  The value of the string
  1099.        *  doesn't change if an error is thrown.
  1100.       */
  1101.       __versa_string&
  1102.       insert(size_type __pos, const _CharT* __s)
  1103.       {
  1104.         __glibcxx_requires_string(__s);
  1105.         return this->replace(__pos, size_type(0), __s,
  1106.                              traits_type::length(__s));
  1107.       }
  1108.  
  1109.       /**
  1110.        *  @brief  Insert multiple characters.
  1111.        *  @param __pos  Index in string to insert at.
  1112.        *  @param __n  Number of characters to insert
  1113.        *  @param __c  The character to insert.
  1114.        *  @return  Reference to this string.
  1115.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1116.        *  @throw  std::out_of_range  If @a __pos is beyond the end of this
  1117.        *  string.
  1118.        *
  1119.        *  Inserts @a __n copies of character @a __c starting at index
  1120.        *  @a __pos.  If adding characters causes the length to exceed
  1121.        *  max_size(), length_error is thrown.  If @a __pos > length(),
  1122.        *  out_of_range is thrown.  The value of the string doesn't
  1123.        *  change if an error is thrown.
  1124.       */
  1125.       __versa_string&
  1126.       insert(size_type __pos, size_type __n, _CharT __c)
  1127.       { return _M_replace_aux(_M_check(__pos, "__versa_string::insert"),
  1128.                               size_type(0), __n, __c); }
  1129.  
  1130.       /**
  1131.        *  @brief  Insert one character.
  1132.        *  @param __p  Iterator referencing position in string to insert at.
  1133.        *  @param __c  The character to insert.
  1134.        *  @return  Iterator referencing newly inserted char.
  1135.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1136.        *
  1137.        *  Inserts character @a __c at position referenced by @a __p.
  1138.        *  If adding character causes the length to exceed max_size(),
  1139.        *  length_error is thrown.  If @a __p is beyond end of string,
  1140.        *  out_of_range is thrown.  The value of the string doesn't
  1141.        *  change if an error is thrown.
  1142.       */
  1143.       iterator
  1144. #if __cplusplus >= 201103L
  1145.       insert(const_iterator __p, _CharT __c)
  1146. #else
  1147.       insert(iterator __p, _CharT __c) 
  1148. #endif
  1149.       {
  1150.         _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend());
  1151.         const size_type __pos = __p - _M_ibegin();
  1152.         _M_replace_aux(__pos, size_type(0), size_type(1), __c);
  1153.         this->_M_set_leaked();
  1154.         return iterator(this->_M_data() + __pos);
  1155.       }
  1156.  
  1157.       /**
  1158.        *  @brief  Remove characters.
  1159.        *  @param __pos  Index of first character to remove (default 0).
  1160.        *  @param __n  Number of characters to remove (default remainder).
  1161.        *  @return  Reference to this string.
  1162.        *  @throw  std::out_of_range  If @a __pos is beyond the end of this
  1163.        *  string.
  1164.        *
  1165.        *  Removes @a __n characters from this string starting at @a
  1166.        *  __pos.  The length of the string is reduced by @a __n.  If
  1167.        *  there are < @a __n characters to remove, the remainder of
  1168.        *  the string is truncated.  If @a __p is beyond end of string,
  1169.        *  out_of_range is thrown.  The value of the string doesn't
  1170.        *  change if an error is thrown.
  1171.       */
  1172.       __versa_string&
  1173.       erase(size_type __pos = 0, size_type __n = npos)
  1174.       {
  1175.         this->_M_erase(_M_check(__pos, "__versa_string::erase"),
  1176.                        _M_limit(__pos, __n));
  1177.         return *this;
  1178.       }
  1179.  
  1180.       /**
  1181.        *  @brief  Remove one character.
  1182.        *  @param __position  Iterator referencing the character to remove.
  1183.        *  @return  iterator referencing same location after removal.
  1184.        *
  1185.        *  Removes the character at @a __position from this string. The
  1186.        *  value of the string doesn't change if an error is thrown.
  1187.       */
  1188.       iterator
  1189. #if __cplusplus >= 201103L
  1190.       erase(const_iterator __position)
  1191. #else
  1192.       erase(iterator __position)       
  1193. #endif
  1194.       {
  1195.         _GLIBCXX_DEBUG_PEDASSERT(__position >= _M_ibegin()
  1196.                                  && __position < _M_iend());
  1197.         const size_type __pos = __position - _M_ibegin();
  1198.         this->_M_erase(__pos, size_type(1));
  1199.         this->_M_set_leaked();
  1200.         return iterator(this->_M_data() + __pos);
  1201.       }
  1202.  
  1203.       /**
  1204.        *  @brief  Remove a range of characters.
  1205.        *  @param __first  Iterator referencing the first character to remove.
  1206.        *  @param __last  Iterator referencing the end of the range.
  1207.        *  @return  Iterator referencing location of first after removal.
  1208.        *
  1209.        *  Removes the characters in the range [first,last) from this
  1210.        *  string.  The value of the string doesn't change if an error
  1211.        *  is thrown.
  1212.       */
  1213.       iterator
  1214. #if __cplusplus >= 201103L
  1215.       erase(const_iterator __first, const_iterator __last)
  1216. #else
  1217.       erase(iterator __first, iterator __last)
  1218. #endif
  1219.       {
  1220.         _GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
  1221.                                  && __last <= _M_iend());
  1222.         const size_type __pos = __first - _M_ibegin();
  1223.         this->_M_erase(__pos, __last - __first);
  1224.         this->_M_set_leaked();
  1225.         return iterator(this->_M_data() + __pos);
  1226.       }
  1227.  
  1228. #if __cplusplus >= 201103L
  1229.       /**
  1230.        *  @brief  Remove the last character.
  1231.        *
  1232.        *  The string must be non-empty.
  1233.        */
  1234.       void
  1235.       pop_back()
  1236.       { this->_M_erase(size()-1, 1); }
  1237. #endif // C++11
  1238.  
  1239.       /**
  1240.        *  @brief  Replace characters with value from another string.
  1241.        *  @param __pos  Index of first character to replace.
  1242.        *  @param __n  Number of characters to be replaced.
  1243.        *  @param __str  String to insert.
  1244.        *  @return  Reference to this string.
  1245.        *  @throw  std::out_of_range  If @a __pos is beyond the end of this
  1246.        *  string.
  1247.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1248.        *
  1249.        *  Removes the characters in the range [pos,pos+n) from this
  1250.        *  string.  In place, the value of @a __str is inserted.  If @a
  1251.        *  __pos is beyond end of string, out_of_range is thrown.  If
  1252.        *  the length of the result exceeds max_size(), length_error is
  1253.        *  thrown.  The value of the string doesn't change if an error
  1254.        *  is thrown.
  1255.       */
  1256.       __versa_string&
  1257.       replace(size_type __pos, size_type __n, const __versa_string& __str)
  1258.       { return this->replace(__pos, __n, __str._M_data(), __str.size()); }
  1259.  
  1260.       /**
  1261.        *  @brief  Replace characters with value from another string.
  1262.        *  @param __pos1  Index of first character to replace.
  1263.        *  @param __n1  Number of characters to be replaced.
  1264.        *  @param __str  String to insert.
  1265.        *  @param __pos2  Index of first character of str to use.
  1266.        *  @param __n2  Number of characters from str to use.
  1267.        *  @return  Reference to this string.
  1268.        *  @throw  std::out_of_range  If @a __pos1 > size() or @a __pos2 >
  1269.        *  str.size().
  1270.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1271.        *
  1272.        *  Removes the characters in the range [pos1,pos1 + n) from
  1273.        *  this string.  In place, the value of @a __str is inserted.
  1274.        *  If @a __pos is beyond end of string, out_of_range is thrown.
  1275.        *  If the length of the result exceeds max_size(), length_error
  1276.        *  is thrown.  The value of the string doesn't change if an
  1277.        *  error is thrown.
  1278.       */
  1279.       __versa_string&
  1280.       replace(size_type __pos1, size_type __n1, const __versa_string& __str,
  1281.               size_type __pos2, size_type __n2)
  1282.       {
  1283.         return this->replace(__pos1, __n1, __str._M_data()
  1284.                              + __str._M_check(__pos2,
  1285.                                               "__versa_string::replace"),
  1286.                              __str._M_limit(__pos2, __n2));
  1287.       }
  1288.  
  1289.       /**
  1290.        *  @brief  Replace characters with value of a C substring.
  1291.        *  @param __pos  Index of first character to replace.
  1292.        *  @param __n1  Number of characters to be replaced.
  1293.        *  @param __s  C string to insert.
  1294.        *  @param __n2  Number of characters from @a __s to use.
  1295.        *  @return  Reference to this string.
  1296.        *  @throw  std::out_of_range  If @a __pos1 > size().
  1297.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1298.        *
  1299.        *  Removes the characters in the range [pos,pos + n1) from this
  1300.        *  string.  In place, the first @a __n2 characters of @a __s
  1301.        *  are inserted, or all of @a __s if @a __n2 is too large.  If
  1302.        *  @a __pos is beyond end of string, out_of_range is thrown.
  1303.        *  If the length of result exceeds max_size(), length_error is
  1304.        *  thrown.  The value of the string doesn't change if an error
  1305.        *  is thrown.
  1306.       */
  1307.       __versa_string&
  1308.       replace(size_type __pos, size_type __n1, const _CharT* __s,
  1309.               size_type __n2)
  1310.       {
  1311.         __glibcxx_requires_string_len(__s, __n2);
  1312.         return _M_replace(_M_check(__pos, "__versa_string::replace"),
  1313.                           _M_limit(__pos, __n1), __s, __n2);
  1314.       }
  1315.  
  1316.       /**
  1317.        *  @brief  Replace characters with value of a C string.
  1318.        *  @param __pos  Index of first character to replace.
  1319.        *  @param __n1  Number of characters to be replaced.
  1320.        *  @param __s  C string to insert.
  1321.        *  @return  Reference to this string.
  1322.        *  @throw  std::out_of_range  If @a __pos > size().
  1323.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1324.        *
  1325.        *  Removes the characters in the range [pos,pos + n1) from this
  1326.        *  string.  In place, the characters of @a __s are inserted.  If
  1327.        *  @a pos is beyond end of string, out_of_range is thrown.  If
  1328.        *  the length of result exceeds max_size(), length_error is thrown.  
  1329.        *  The value of the string doesn't change if an error is thrown.
  1330.       */
  1331.       __versa_string&
  1332.       replace(size_type __pos, size_type __n1, const _CharT* __s)
  1333.       {
  1334.         __glibcxx_requires_string(__s);
  1335.         return this->replace(__pos, __n1, __s, traits_type::length(__s));
  1336.       }
  1337.  
  1338.       /**
  1339.        *  @brief  Replace characters with multiple characters.
  1340.        *  @param __pos  Index of first character to replace.
  1341.        *  @param __n1  Number of characters to be replaced.
  1342.        *  @param __n2  Number of characters to insert.
  1343.        *  @param __c  Character to insert.
  1344.        *  @return  Reference to this string.
  1345.        *  @throw  std::out_of_range  If @a __pos > size().
  1346.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1347.        *
  1348.        *  Removes the characters in the range [pos,pos + n1) from this
  1349.        *  string.  In place, @a __n2 copies of @a __c are inserted.
  1350.        *  If @a __pos is beyond end of string, out_of_range is thrown.
  1351.        *  If the length of result exceeds max_size(), length_error is
  1352.        *  thrown.  The value of the string doesn't change if an error
  1353.        *  is thrown.
  1354.       */
  1355.       __versa_string&
  1356.       replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
  1357.       { return _M_replace_aux(_M_check(__pos, "__versa_string::replace"),
  1358.                               _M_limit(__pos, __n1), __n2, __c); }
  1359.  
  1360.       /**
  1361.        *  @brief  Replace range of characters with string.
  1362.        *  @param __i1  Iterator referencing start of range to replace.
  1363.        *  @param __i2  Iterator referencing end of range to replace.
  1364.        *  @param __str  String value to insert.
  1365.        *  @return  Reference to this string.
  1366.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1367.        *
  1368.        *  Removes the characters in the range [i1,i2).  In place, the
  1369.        *  value of @a __str is inserted.  If the length of result
  1370.        *  exceeds max_size(), length_error is thrown.  The value of
  1371.        *  the string doesn't change if an error is thrown.
  1372.       */
  1373.       __versa_string&
  1374. #if __cplusplus >= 201103L
  1375.       replace(const_iterator __i1, const_iterator __i2,
  1376.               const __versa_string& __str)
  1377. #else
  1378.       replace(iterator __i1, iterator __i2, const __versa_string& __str)
  1379. #endif
  1380.       { return this->replace(__i1, __i2, __str._M_data(), __str.size()); }
  1381.  
  1382.       /**
  1383.        *  @brief  Replace range of characters with C substring.
  1384.        *  @param __i1  Iterator referencing start of range to replace.
  1385.        *  @param __i2  Iterator referencing end of range to replace.
  1386.        *  @param __s  C string value to insert.
  1387.        *  @param __n  Number of characters from s to insert.
  1388.        *  @return  Reference to this string.
  1389.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1390.        *
  1391.        *  Removes the characters in the range [i1,i2).  In place, the
  1392.        *  first @a n characters of @a __s are inserted.  If the length
  1393.        *  of result exceeds max_size(), length_error is thrown.  The
  1394.        *  value of the string doesn't change if an error is thrown.
  1395.       */
  1396.       __versa_string&
  1397. #if __cplusplus >= 201103L
  1398.       replace(const_iterator __i1, const_iterator __i2,
  1399.               const _CharT* __s, size_type __n)
  1400. #else
  1401.       replace(iterator __i1, iterator __i2, const _CharT* __s, size_type __n)
  1402. #endif
  1403.       {
  1404.         _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1405.                                  && __i2 <= _M_iend());
  1406.         return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __s, __n);
  1407.       }
  1408.  
  1409.       /**
  1410.        *  @brief  Replace range of characters with C string.
  1411.        *  @param __i1  Iterator referencing start of range to replace.
  1412.        *  @param __i2  Iterator referencing end of range to replace.
  1413.        *  @param __s  C string value to insert.
  1414.        *  @return  Reference to this string.
  1415.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1416.        *
  1417.        *  Removes the characters in the range [i1,i2).  In place, the
  1418.        *  characters of @a __s are inserted.  If the length of result
  1419.        *  exceeds max_size(), length_error is thrown.  The value of
  1420.        *  the string doesn't change if an error is thrown.
  1421.       */
  1422.       __versa_string&
  1423. #if __cplusplus >= 201103L
  1424.       replace(const_iterator __i1, const_iterator __i2, const _CharT* __s)
  1425. #else
  1426.       replace(iterator __i1, iterator __i2, const _CharT* __s) 
  1427. #endif
  1428.       {
  1429.         __glibcxx_requires_string(__s);
  1430.         return this->replace(__i1, __i2, __s, traits_type::length(__s));
  1431.       }
  1432.  
  1433.       /**
  1434.        *  @brief  Replace range of characters with multiple characters
  1435.        *  @param __i1  Iterator referencing start of range to replace.
  1436.        *  @param __i2  Iterator referencing end of range to replace.
  1437.        *  @param __n  Number of characters to insert.
  1438.        *  @param __c  Character to insert.
  1439.        *  @return  Reference to this string.
  1440.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1441.        *
  1442.        *  Removes the characters in the range [i1,i2).  In place, @a
  1443.        *  __n copies of @a __c are inserted.  If the length of result
  1444.        *  exceeds max_size(), length_error is thrown.  The value of
  1445.        *  the string doesn't change if an error is thrown.
  1446.       */
  1447.       __versa_string&
  1448. #if __cplusplus >= 201103L
  1449.       replace(const_iterator __i1, const_iterator __i2, size_type __n,
  1450.               _CharT __c)
  1451. #else
  1452.       replace(iterator __i1, iterator __i2, size_type __n, _CharT __c)
  1453. #endif
  1454.       {
  1455.         _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1456.                                  && __i2 <= _M_iend());
  1457.         return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __c);
  1458.       }
  1459.  
  1460.       /**
  1461.        *  @brief  Replace range of characters with range.
  1462.        *  @param __i1  Iterator referencing start of range to replace.
  1463.        *  @param __i2  Iterator referencing end of range to replace.
  1464.        *  @param __k1  Iterator referencing start of range to insert.
  1465.        *  @param __k2  Iterator referencing end of range to insert.
  1466.        *  @return  Reference to this string.
  1467.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1468.        *
  1469.        *  Removes the characters in the range [i1,i2).  In place,
  1470.        *  characters in the range [k1,k2) are inserted.  If the length
  1471.        *  of result exceeds max_size(), length_error is thrown.  The
  1472.        *  value of the string doesn't change if an error is thrown.
  1473.       */
  1474. #if __cplusplus >= 201103L
  1475.       template<class _InputIterator,
  1476.                typename = std::_RequireInputIter<_InputIterator>>
  1477.         __versa_string&
  1478.         replace(const_iterator __i1, const_iterator __i2,
  1479.                 _InputIterator __k1, _InputIterator __k2)
  1480.         {
  1481.           _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1482.                                    && __i2 <= _M_iend());
  1483.           __glibcxx_requires_valid_range(__k1, __k2);
  1484.           return this->_M_replace_dispatch(__i1, __i2, __k1, __k2,
  1485.                                            std::__false_type());
  1486.         }
  1487. #else
  1488.       template<class _InputIterator>
  1489.         __versa_string&
  1490.         replace(iterator __i1, iterator __i2,
  1491.                 _InputIterator __k1, _InputIterator __k2)
  1492.         {
  1493.           _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1494.                                    && __i2 <= _M_iend());
  1495.           __glibcxx_requires_valid_range(__k1, __k2);
  1496.           typedef typename std::__is_integer<_InputIterator>::__type _Integral;
  1497.           return this->_M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral());
  1498.         }
  1499. #endif
  1500.  
  1501.       // Specializations for the common case of pointer and iterator:
  1502.       // useful to avoid the overhead of temporary buffering in _M_replace.
  1503.       __versa_string&
  1504. #if __cplusplus >= 201103L
  1505.       replace(const_iterator __i1, const_iterator __i2,
  1506.               _CharT* __k1, _CharT* __k2)
  1507. #else
  1508.       replace(iterator __i1, iterator __i2,
  1509.               _CharT* __k1, _CharT* __k2)
  1510. #endif
  1511.       {
  1512.         _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1513.                                  && __i2 <= _M_iend());
  1514.         __glibcxx_requires_valid_range(__k1, __k2);
  1515.         return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
  1516.                              __k1, __k2 - __k1);
  1517.       }
  1518.  
  1519.       __versa_string&
  1520. #if __cplusplus >= 201103L
  1521.       replace(const_iterator __i1, const_iterator __i2,
  1522.               const _CharT* __k1, const _CharT* __k2)
  1523. #else
  1524.       replace(iterator __i1, iterator __i2,
  1525.               const _CharT* __k1, const _CharT* __k2)
  1526. #endif
  1527.       {
  1528.         _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1529.                                  && __i2 <= _M_iend());
  1530.         __glibcxx_requires_valid_range(__k1, __k2);
  1531.         return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
  1532.                              __k1, __k2 - __k1);
  1533.       }
  1534.  
  1535.       __versa_string&
  1536. #if __cplusplus >= 201103L
  1537.       replace(const_iterator __i1, const_iterator __i2,
  1538.               iterator __k1, iterator __k2)
  1539. #else
  1540.       replace(iterator __i1, iterator __i2,
  1541.               iterator __k1, iterator __k2)
  1542. #endif
  1543.       {
  1544.         _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1545.                                  && __i2 <= _M_iend());
  1546.         __glibcxx_requires_valid_range(__k1, __k2);
  1547.         return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
  1548.                              __k1.base(), __k2 - __k1);
  1549.       }
  1550.  
  1551.       __versa_string&
  1552. #if __cplusplus >= 201103L
  1553.       replace(const_iterator __i1, const_iterator __i2,
  1554.               const_iterator __k1, const_iterator __k2)
  1555. #else
  1556.       replace(iterator __i1, iterator __i2,
  1557.               const_iterator __k1, const_iterator __k2)
  1558. #endif
  1559.       {
  1560.         _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
  1561.                                  && __i2 <= _M_iend());
  1562.         __glibcxx_requires_valid_range(__k1, __k2);
  1563.         return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
  1564.                              __k1.base(), __k2 - __k1);
  1565.       }
  1566.      
  1567. #if __cplusplus >= 201103L
  1568.       /**
  1569.        *  @brief  Replace range of characters with initializer_list.
  1570.        *  @param __i1  Iterator referencing start of range to replace.
  1571.        *  @param __i2  Iterator referencing end of range to replace.
  1572.        *  @param __l  The initializer_list of characters to insert.
  1573.        *  @return  Reference to this string.
  1574.        *  @throw  std::length_error  If new length exceeds @c max_size().
  1575.        *
  1576.        *  Removes the characters in the range [i1,i2).  In place,
  1577.        *  characters in the range [k1,k2) are inserted.  If the length
  1578.        *  of result exceeds max_size(), length_error is thrown.  The
  1579.        *  value of the string doesn't change if an error is thrown.
  1580.       */
  1581.       __versa_string&
  1582.       replace(const_iterator __i1, const_iterator __i2,
  1583.               std::initializer_list<_CharT> __l)
  1584.       { return this->replace(__i1, __i2, __l.begin(), __l.end()); }
  1585. #endif // C++11
  1586.  
  1587.     private:
  1588.       template<class _Integer>
  1589.         __versa_string&
  1590.         _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
  1591.                             _Integer __n, _Integer __val, std::__true_type)
  1592.         { return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __val); }
  1593.  
  1594.       template<class _InputIterator>
  1595.         __versa_string&
  1596.         _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
  1597.                             _InputIterator __k1, _InputIterator __k2,
  1598.                             std::__false_type);
  1599.  
  1600.       __versa_string&
  1601.       _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
  1602.                      _CharT __c);
  1603.  
  1604.       __versa_string&
  1605.       _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
  1606.                  const size_type __len2);
  1607.  
  1608.       __versa_string&
  1609.       _M_append(const _CharT* __s, size_type __n);
  1610.  
  1611.     public:
  1612.  
  1613.       /**
  1614.        *  @brief  Copy substring into C string.
  1615.        *  @param __s  C string to copy value into.
  1616.        *  @param __n  Number of characters to copy.
  1617.        *  @param __pos  Index of first character to copy.
  1618.        *  @return  Number of characters actually copied
  1619.        *  @throw  std::out_of_range  If pos > size().
  1620.        *
  1621.        *  Copies up to @a __n characters starting at @a __pos into the
  1622.        *  C string @a s.  If @a __pos is greater than size(),
  1623.        *  out_of_range is thrown.
  1624.       */
  1625.       size_type
  1626.       copy(_CharT* __s, size_type __n, size_type __pos = 0) const;
  1627.  
  1628.       /**
  1629.        *  @brief  Swap contents with another string.
  1630.        *  @param __s  String to swap with.
  1631.        *
  1632.        *  Exchanges the contents of this string with that of @a __s in
  1633.        *  constant time.
  1634.       */
  1635.       void
  1636.       swap(__versa_string& __s) _GLIBCXX_NOEXCEPT
  1637.       { this->_M_swap(__s); }
  1638.  
  1639.       // String operations:
  1640.       /**
  1641.        *  @brief  Return const pointer to null-terminated contents.
  1642.        *
  1643.        *  This is a handle to internal data.  Do not modify or dire things may
  1644.        *  happen.
  1645.       */
  1646.       const _CharT*
  1647.       c_str() const _GLIBCXX_NOEXCEPT
  1648.       { return this->_M_data(); }
  1649.  
  1650.       /**
  1651.        *  @brief  Return const pointer to contents.
  1652.        *
  1653.        *  This is a handle to internal data.  Do not modify or dire things may
  1654.        *  happen.
  1655.       */
  1656.       const _CharT*
  1657.       data() const _GLIBCXX_NOEXCEPT
  1658.       { return this->_M_data(); }
  1659.  
  1660.       /**
  1661.        *  @brief  Return copy of allocator used to construct this string.
  1662.       */
  1663.       allocator_type
  1664.       get_allocator() const _GLIBCXX_NOEXCEPT
  1665.       { return allocator_type(this->_M_get_allocator()); }
  1666.  
  1667.       /**
  1668.        *  @brief  Find position of a C substring.
  1669.        *  @param __s  C string to locate.
  1670.        *  @param __pos  Index of character to search from.
  1671.        *  @param __n  Number of characters from @a __s to search for.
  1672.        *  @return  Index of start of first occurrence.
  1673.        *
  1674.        *  Starting from @a __pos, searches forward for the first @a
  1675.        *  __n characters in @a __s within this string.  If found,
  1676.        *  returns the index where it begins.  If not found, returns
  1677.        *  npos.
  1678.       */
  1679.       size_type
  1680.       find(const _CharT* __s, size_type __pos, size_type __n) const;
  1681.  
  1682.       /**
  1683.        *  @brief  Find position of a string.
  1684.        *  @param __str  String to locate.
  1685.        *  @param __pos  Index of character to search from (default 0).
  1686.        *  @return  Index of start of first occurrence.
  1687.        *
  1688.        *  Starting from @a __pos, searches forward for value of @a
  1689.        *  __str within this string.  If found, returns the index where
  1690.        *  it begins.  If not found, returns npos.
  1691.       */
  1692.       size_type
  1693.       find(const __versa_string& __str, size_type __pos = 0) const
  1694.         _GLIBCXX_NOEXCEPT
  1695.       { return this->find(__str.data(), __pos, __str.size()); }
  1696.  
  1697.       /**
  1698.        *  @brief  Find position of a C string.
  1699.        *  @param __s  C string to locate.
  1700.        *  @param __pos  Index of character to search from (default 0).
  1701.        *  @return  Index of start of first occurrence.
  1702.        *
  1703.        *  Starting from @a __pos, searches forward for the value of @a
  1704.        *  __s within this string.  If found, returns the index where
  1705.        *  it begins.  If not found, returns npos.
  1706.       */
  1707.       size_type
  1708.       find(const _CharT* __s, size_type __pos = 0) const
  1709.       {
  1710.         __glibcxx_requires_string(__s);
  1711.         return this->find(__s, __pos, traits_type::length(__s));
  1712.       }
  1713.  
  1714.       /**
  1715.        *  @brief  Find position of a character.
  1716.        *  @param __c  Character to locate.
  1717.        *  @param __pos  Index of character to search from (default 0).
  1718.        *  @return  Index of first occurrence.
  1719.        *
  1720.        *  Starting from @a __pos, searches forward for @a __c within
  1721.        *  this string.  If found, returns the index where it was
  1722.        *  found.  If not found, returns npos.
  1723.       */
  1724.       size_type
  1725.       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
  1726.  
  1727.       /**
  1728.        *  @brief  Find last position of a string.
  1729.        *  @param __str  String to locate.
  1730.        *  @param __pos  Index of character to search back from (default end).
  1731.        *  @return  Index of start of last occurrence.
  1732.        *
  1733.        *  Starting from @a __pos, searches backward for value of @a
  1734.        *  __str within this string.  If found, returns the index where
  1735.        *  it begins.  If not found, returns npos.
  1736.       */
  1737.       size_type
  1738.       rfind(const __versa_string& __str, size_type __pos = npos) const
  1739.         _GLIBCXX_NOEXCEPT
  1740.       { return this->rfind(__str.data(), __pos, __str.size()); }
  1741.  
  1742.       /**
  1743.        *  @brief  Find last position of a C substring.
  1744.        *  @param __s  C string to locate.
  1745.        *  @param __pos  Index of character to search back from.
  1746.        *  @param __n  Number of characters from s to search for.
  1747.        *  @return  Index of start of last occurrence.
  1748.        *
  1749.        *  Starting from @a __pos, searches backward for the first @a
  1750.        *  __n characters in @a __s within this string.  If found,
  1751.        *  returns the index where it begins.  If not found, returns
  1752.        *  npos.
  1753.       */
  1754.       size_type
  1755.       rfind(const _CharT* __s, size_type __pos, size_type __n) const;
  1756.  
  1757.       /**
  1758.        *  @brief  Find last position of a C string.
  1759.        *  @param __s  C string to locate.
  1760.        *  @param __pos  Index of character to start search at (default end).
  1761.        *  @return  Index of start of  last occurrence.
  1762.        *
  1763.        *  Starting from @a __pos, searches backward for the value of
  1764.        *  @a __s within this string.  If found, returns the index
  1765.        *  where it begins.  If not found, returns npos.
  1766.       */
  1767.       size_type
  1768.       rfind(const _CharT* __s, size_type __pos = npos) const
  1769.       {
  1770.         __glibcxx_requires_string(__s);
  1771.         return this->rfind(__s, __pos, traits_type::length(__s));
  1772.       }
  1773.  
  1774.       /**
  1775.        *  @brief  Find last position of a character.
  1776.        *  @param __c  Character to locate.
  1777.        *  @param __pos  Index of character to search back from (default end).
  1778.        *  @return  Index of last occurrence.
  1779.        *
  1780.        *  Starting from @a __pos, searches backward for @a __c within
  1781.        *  this string.  If found, returns the index where it was
  1782.        *  found.  If not found, returns npos.
  1783.       */
  1784.       size_type
  1785.       rfind(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT;
  1786.  
  1787.       /**
  1788.        *  @brief  Find position of a character of string.
  1789.        *  @param __str  String containing characters to locate.
  1790.        *  @param __pos  Index of character to search from (default 0).
  1791.        *  @return  Index of first occurrence.
  1792.        *
  1793.        *  Starting from @a __pos, searches forward for one of the characters of
  1794.        *  @a __str within this string.  If found, returns the index where it was
  1795.        *  found.  If not found, returns npos.
  1796.       */
  1797.       size_type
  1798.       find_first_of(const __versa_string& __str, size_type __pos = 0) const
  1799.         _GLIBCXX_NOEXCEPT
  1800.       { return this->find_first_of(__str.data(), __pos, __str.size()); }
  1801.  
  1802.       /**
  1803.        *  @brief  Find position of a character of C substring.
  1804.        *  @param __s  String containing characters to locate.
  1805.        *  @param __pos  Index of character to search from.
  1806.        *  @param __n  Number of characters from s to search for.
  1807.        *  @return  Index of first occurrence.
  1808.        *
  1809.        *  Starting from @a __pos, searches forward for one of the
  1810.        *  first @a __n characters of @a __s within this string.  If
  1811.        *  found, returns the index where it was found.  If not found,
  1812.        *  returns npos.
  1813.       */
  1814.       size_type
  1815.       find_first_of(const _CharT* __s, size_type __pos, size_type __n) const;
  1816.  
  1817.       /**
  1818.        *  @brief  Find position of a character of C string.
  1819.        *  @param __s  String containing characters to locate.
  1820.        *  @param __pos  Index of character to search from (default 0).
  1821.        *  @return  Index of first occurrence.
  1822.        *
  1823.        *  Starting from @a __pos, searches forward for one of the
  1824.        *  characters of @a __s within this string.  If found, returns
  1825.        *  the index where it was found.  If not found, returns npos.
  1826.       */
  1827.       size_type
  1828.       find_first_of(const _CharT* __s, size_type __pos = 0) const
  1829.       {
  1830.         __glibcxx_requires_string(__s);
  1831.         return this->find_first_of(__s, __pos, traits_type::length(__s));
  1832.       }
  1833.  
  1834.       /**
  1835.        *  @brief  Find position of a character.
  1836.        *  @param __c  Character to locate.
  1837.        *  @param __pos  Index of character to search from (default 0).
  1838.        *  @return  Index of first occurrence.
  1839.        *
  1840.        *  Starting from @a __pos, searches forward for the character
  1841.        *  @a __c within this string.  If found, returns the index
  1842.        *  where it was found.  If not found, returns npos.
  1843.        *
  1844.        *  Note: equivalent to find(c, pos).
  1845.       */
  1846.       size_type
  1847.       find_first_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
  1848.       { return this->find(__c, __pos); }
  1849.  
  1850.       /**
  1851.        *  @brief  Find last position of a character of string.
  1852.        *  @param __str  String containing characters to locate.
  1853.        *  @param __pos  Index of character to search back from (default end).
  1854.        *  @return  Index of last occurrence.
  1855.        *
  1856.        *  Starting from @a __pos, searches backward for one of the
  1857.        *  characters of @a __str within this string.  If found,
  1858.        *  returns the index where it was found.  If not found, returns
  1859.        *  npos.
  1860.       */
  1861.       size_type
  1862.       find_last_of(const __versa_string& __str, size_type __pos = npos) const
  1863.         _GLIBCXX_NOEXCEPT
  1864.       { return this->find_last_of(__str.data(), __pos, __str.size()); }
  1865.  
  1866.       /**
  1867.        *  @brief  Find last position of a character of C substring.
  1868.        *  @param __s  C string containing characters to locate.
  1869.        *  @param __pos  Index of character to search back from.
  1870.        *  @param __n  Number of characters from s to search for.
  1871.        *  @return  Index of last occurrence.
  1872.        *
  1873.        *  Starting from @a __pos, searches backward for one of the
  1874.        *  first @a __n characters of @a __s within this string.  If
  1875.        *  found, returns the index where it was found.  If not found,
  1876.        *  returns npos.
  1877.       */
  1878.       size_type
  1879.       find_last_of(const _CharT* __s, size_type __pos, size_type __n) const;
  1880.  
  1881.       /**
  1882.        *  @brief  Find last position of a character of C string.
  1883.        *  @param __s  C string containing characters to locate.
  1884.        *  @param __pos  Index of character to search back from (default end).
  1885.        *  @return  Index of last occurrence.
  1886.        *
  1887.        *  Starting from @a __pos, searches backward for one of the
  1888.        *  characters of @a __s within this string.  If found, returns
  1889.        *  the index where it was found.  If not found, returns npos.
  1890.       */
  1891.       size_type
  1892.       find_last_of(const _CharT* __s, size_type __pos = npos) const
  1893.       {
  1894.         __glibcxx_requires_string(__s);
  1895.         return this->find_last_of(__s, __pos, traits_type::length(__s));
  1896.       }
  1897.  
  1898.       /**
  1899.        *  @brief  Find last position of a character.
  1900.        *  @param __c  Character to locate.
  1901.        *  @param __pos  Index of character to search back from (default end).
  1902.        *  @return  Index of last occurrence.
  1903.        *
  1904.        *  Starting from @a __pos, searches backward for @a __c within
  1905.        *  this string.  If found, returns the index where it was
  1906.        *  found.  If not found, returns npos.
  1907.        *
  1908.        *  Note: equivalent to rfind(c, pos).
  1909.       */
  1910.       size_type
  1911.       find_last_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT
  1912.       { return this->rfind(__c, __pos); }
  1913.  
  1914.       /**
  1915.        *  @brief  Find position of a character not in string.
  1916.        *  @param __str  String containing characters to avoid.
  1917.        *  @param __pos  Index of character to search from (default 0).
  1918.        *  @return  Index of first occurrence.
  1919.        *
  1920.        *  Starting from @a __pos, searches forward for a character not
  1921.        *  contained in @a __str within this string.  If found, returns
  1922.        *  the index where it was found.  If not found, returns npos.
  1923.       */
  1924.       size_type
  1925.       find_first_not_of(const __versa_string& __str, size_type __pos = 0) const
  1926.         _GLIBCXX_NOEXCEPT
  1927.       { return this->find_first_not_of(__str.data(), __pos, __str.size()); }
  1928.  
  1929.       /**
  1930.        *  @brief  Find position of a character not in C substring.
  1931.        *  @param __s  C string containing characters to avoid.
  1932.        *  @param __pos  Index of character to search from.
  1933.        *  @param __n  Number of characters from s to consider.
  1934.        *  @return  Index of first occurrence.
  1935.        *
  1936.        *  Starting from @a __pos, searches forward for a character not
  1937.        *  contained in the first @a __n characters of @a __s within
  1938.        *  this string.  If found, returns the index where it was
  1939.        *  found.  If not found, returns npos.
  1940.       */
  1941.       size_type
  1942.       find_first_not_of(const _CharT* __s, size_type __pos,
  1943.                         size_type __n) const;
  1944.  
  1945.       /**
  1946.        *  @brief  Find position of a character not in C string.
  1947.        *  @param __s  C string containing characters to avoid.
  1948.        *  @param __pos  Index of character to search from (default 0).
  1949.        *  @return  Index of first occurrence.
  1950.        *
  1951.        *  Starting from @a __pos, searches forward for a character not
  1952.        *  contained in @a __s within this string.  If found, returns
  1953.        *  the index where it was found.  If not found, returns npos.
  1954.       */
  1955.       size_type
  1956.       find_first_not_of(const _CharT* __s, size_type __pos = 0) const
  1957.       {
  1958.         __glibcxx_requires_string(__s);
  1959.         return this->find_first_not_of(__s, __pos, traits_type::length(__s));
  1960.       }
  1961.  
  1962.       /**
  1963.        *  @brief  Find position of a different character.
  1964.        *  @param __c  Character to avoid.
  1965.        *  @param __pos  Index of character to search from (default 0).
  1966.        *  @return  Index of first occurrence.
  1967.        *
  1968.        *  Starting from @a __pos, searches forward for a character
  1969.        *  other than @a __c within this string.  If found, returns the
  1970.        *  index where it was found.  If not found, returns npos.
  1971.       */
  1972.       size_type
  1973.       find_first_not_of(_CharT __c, size_type __pos = 0) const
  1974.         _GLIBCXX_NOEXCEPT;
  1975.  
  1976.       /**
  1977.        *  @brief  Find last position of a character not in string.
  1978.        *  @param __str  String containing characters to avoid.
  1979.        *  @param __pos  Index of character to search back from (default end).
  1980.        *  @return  Index of last occurrence.
  1981.        *
  1982.        *  Starting from @a __pos, searches backward for a character
  1983.        *  not contained in @a __str within this string.  If found,
  1984.        *  returns the index where it was found.  If not found, returns
  1985.        *  npos.
  1986.       */
  1987.       size_type
  1988.       find_last_not_of(const __versa_string& __str,
  1989.                        size_type __pos = npos) const _GLIBCXX_NOEXCEPT
  1990.       { return this->find_last_not_of(__str.data(), __pos, __str.size()); }
  1991.  
  1992.       /**
  1993.        *  @brief  Find last position of a character not in C substring.
  1994.        *  @param __s  C string containing characters to avoid.
  1995.        *  @param __pos  Index of character to search back from.
  1996.        *  @param __n  Number of characters from s to consider.
  1997.        *  @return  Index of last occurrence.
  1998.        *
  1999.        *  Starting from @a __pos, searches backward for a character
  2000.        *  not contained in the first @a __n characters of @a __s
  2001.        *  within this string.  If found, returns the index where it
  2002.        *  was found.  If not found, returns npos.
  2003.       */
  2004.       size_type
  2005.       find_last_not_of(const _CharT* __s, size_type __pos,
  2006.                        size_type __n) const;
  2007.       /**
  2008.        *  @brief  Find last position of a character not in C string.
  2009.        *  @param __s  C string containing characters to avoid.
  2010.        *  @param __pos  Index of character to search back from (default end).
  2011.        *  @return  Index of last occurrence.
  2012.        *
  2013.        *  Starting from @a __pos, searches backward for a character
  2014.        *  not contained in @a __s within this string.  If found,
  2015.        *  returns the index where it was found.  If not found, returns
  2016.        *  npos.
  2017.       */
  2018.       size_type
  2019.       find_last_not_of(const _CharT* __s, size_type __pos = npos) const
  2020.       {
  2021.         __glibcxx_requires_string(__s);
  2022.         return this->find_last_not_of(__s, __pos, traits_type::length(__s));
  2023.       }
  2024.  
  2025.       /**
  2026.        *  @brief  Find last position of a different character.
  2027.        *  @param __c  Character to avoid.
  2028.        *  @param __pos  Index of character to search back from (default end).
  2029.        *  @return  Index of last occurrence.
  2030.        *
  2031.        *  Starting from @a __pos, searches backward for a character
  2032.        *  other than @a __c within this string.  If found, returns the
  2033.        *  index where it was found.  If not found, returns npos.
  2034.       */
  2035.       size_type
  2036.       find_last_not_of(_CharT __c, size_type __pos = npos) const
  2037.         _GLIBCXX_NOEXCEPT;
  2038.  
  2039.       /**
  2040.        *  @brief  Get a substring.
  2041.        *  @param __pos  Index of first character (default 0).
  2042.        *  @param __n  Number of characters in substring (default remainder).
  2043.        *  @return  The new string.
  2044.        *  @throw  std::out_of_range  If pos > size().
  2045.        *
  2046.        *  Construct and return a new string using the @a __n
  2047.        *  characters starting at @a __pos.  If the string is too
  2048.        *  short, use the remainder of the characters.  If @a __pos is
  2049.        *  beyond the end of the string, out_of_range is thrown.
  2050.       */
  2051.       __versa_string
  2052.       substr(size_type __pos = 0, size_type __n = npos) const
  2053.       {
  2054.         return __versa_string(*this, _M_check(__pos, "__versa_string::substr"),
  2055.                               __n);
  2056.       }
  2057.  
  2058.       /**
  2059.        *  @brief  Compare to a string.
  2060.        *  @param __str  String to compare against.
  2061.        *  @return  Integer < 0, 0, or > 0.
  2062.        *
  2063.        *  Returns an integer < 0 if this string is ordered before @a
  2064.        *  __str, 0 if their values are equivalent, or > 0 if this
  2065.        *  string is ordered after @a __str.  Determines the effective
  2066.        *  length rlen of the strings to compare as the smallest of
  2067.        *  size() and str.size().  The function then compares the two
  2068.        *  strings by calling traits::compare(data(), str.data(),rlen).
  2069.        *  If the result of the comparison is nonzero returns it,
  2070.        *  otherwise the shorter one is ordered first.
  2071.       */
  2072.       int
  2073.       compare(const __versa_string& __str) const
  2074.       {
  2075.         if (this->_M_compare(__str))
  2076.           return 0;
  2077.  
  2078.         const size_type __size = this->size();
  2079.         const size_type __osize = __str.size();
  2080.         const size_type __len = std::min(__size, __osize);
  2081.  
  2082.         int __r = traits_type::compare(this->_M_data(), __str.data(), __len);
  2083.         if (!__r)
  2084.           __r = this->_S_compare(__size, __osize);
  2085.         return __r;
  2086.       }
  2087.  
  2088.       /**
  2089.        *  @brief  Compare substring to a string.
  2090.        *  @param __pos  Index of first character of substring.
  2091.        *  @param __n  Number of characters in substring.
  2092.        *  @param __str  String to compare against.
  2093.        *  @return  Integer < 0, 0, or > 0.
  2094.        *
  2095.        *  Form the substring of this string from the @a __n characters
  2096.        *  starting at @a __pos.  Returns an integer < 0 if the
  2097.        *  substring is ordered before @a __str, 0 if their values are
  2098.        *  equivalent, or > 0 if the substring is ordered after @a
  2099.        *  __str.  Determines the effective length rlen of the strings
  2100.        *  to compare as the smallest of the length of the substring
  2101.        *  and @a __str.size().  The function then compares the two
  2102.        *  strings by calling
  2103.        *  traits::compare(substring.data(),str.data(),rlen).  If the
  2104.        *  result of the comparison is nonzero returns it, otherwise
  2105.        *  the shorter one is ordered first.
  2106.       */
  2107.       int
  2108.       compare(size_type __pos, size_type __n,
  2109.               const __versa_string& __str) const;
  2110.  
  2111.       /**
  2112.        *  @brief  Compare substring to a substring.
  2113.        *  @param __pos1  Index of first character of substring.
  2114.        *  @param __n1  Number of characters in substring.
  2115.        *  @param __str  String to compare against.
  2116.        *  @param __pos2  Index of first character of substring of str.
  2117.        *  @param __n2  Number of characters in substring of str.
  2118.        *  @return  Integer < 0, 0, or > 0.
  2119.        *
  2120.        *  Form the substring of this string from the @a __n1
  2121.        *  characters starting at @a __pos1.  Form the substring of @a
  2122.        *  __str from the @a __n2 characters starting at @a __pos2.
  2123.        *  Returns an integer < 0 if this substring is ordered before
  2124.        *  the substring of @a __str, 0 if their values are equivalent,
  2125.        *  or > 0 if this substring is ordered after the substring of
  2126.        *  @a __str.  Determines the effective length rlen of the
  2127.        *  strings to compare as the smallest of the lengths of the
  2128.        *  substrings.  The function then compares the two strings by
  2129.        *  calling
  2130.        *  traits::compare(substring.data(),str.substr(pos2,n2).data(),rlen).
  2131.        *  If the result of the comparison is nonzero returns it,
  2132.        *  otherwise the shorter one is ordered first.
  2133.       */
  2134.       int
  2135.       compare(size_type __pos1, size_type __n1, const __versa_string& __str,
  2136.               size_type __pos2, size_type __n2) const;
  2137.  
  2138.       /**
  2139.        *  @brief  Compare to a C string.
  2140.        *  @param __s  C string to compare against.
  2141.        *  @return  Integer < 0, 0, or > 0.
  2142.        *
  2143.        *  Returns an integer < 0 if this string is ordered before @a
  2144.        *  __s, 0 if their values are equivalent, or > 0 if this string
  2145.        *  is ordered after @a __s.  Determines the effective length
  2146.        *  rlen of the strings to compare as the smallest of size() and
  2147.        *  the length of a string constructed from @a __s.  The
  2148.        *  function then compares the two strings by calling
  2149.        *  traits::compare(data(),s,rlen).  If the result of the
  2150.        *  comparison is nonzero returns it, otherwise the shorter one
  2151.        *  is ordered first.
  2152.       */
  2153.       int
  2154.       compare(const _CharT* __s) const;
  2155.  
  2156.       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  2157.       // 5 String::compare specification questionable
  2158.       /**
  2159.        *  @brief  Compare substring to a C string.
  2160.        *  @param __pos  Index of first character of substring.
  2161.        *  @param __n1  Number of characters in substring.
  2162.        *  @param __s  C string to compare against.
  2163.        *  @return  Integer < 0, 0, or > 0.
  2164.        *
  2165.        *  Form the substring of this string from the @a __n1
  2166.        *  characters starting at @a __pos.  Returns an integer < 0 if
  2167.        *  the substring is ordered before @a __s, 0 if their values
  2168.        *  are equivalent, or > 0 if the substring is ordered after @a
  2169.        *  __s.  Determines the effective length rlen of the strings to
  2170.        *  compare as the smallest of the length of the substring and
  2171.        *  the length of a string constructed from @a __s.  The
  2172.        *  function then compares the two string by calling
  2173.        *  traits::compare(substring.data(),s,rlen).  If the result of
  2174.        *  the comparison is nonzero returns it, otherwise the shorter
  2175.        *  one is ordered first.
  2176.       */
  2177.       int
  2178.       compare(size_type __pos, size_type __n1, const _CharT* __s) const;
  2179.  
  2180.       /**
  2181.        *  @brief  Compare substring against a character array.
  2182.        *  @param __pos  Index of first character of substring.
  2183.        *  @param __n1  Number of characters in substring.
  2184.        *  @param __s  character array to compare against.
  2185.        *  @param __n2  Number of characters of s.
  2186.        *  @return  Integer < 0, 0, or > 0.
  2187.        *
  2188.        *  Form the substring of this string from the @a __n1
  2189.        *  characters starting at @a __pos.  Form a string from the
  2190.        *  first @a __n2 characters of @a __s.  Returns an integer < 0
  2191.        *  if this substring is ordered before the string from @a __s,
  2192.        *  0 if their values are equivalent, or > 0 if this substring
  2193.        *  is ordered after the string from @a __s.  Determines the
  2194.        *  effective length rlen of the strings to compare as the
  2195.        *  smallest of the length of the substring and @a __n2.  The
  2196.        *  function then compares the two strings by calling
  2197.        *  traits::compare(substring.data(),__s,rlen).  If the result of
  2198.        *  the comparison is nonzero returns it, otherwise the shorter
  2199.        *  one is ordered first.
  2200.        *
  2201.        *  NB: __s must have at least n2 characters, <em>\\0</em> has no special
  2202.        *  meaning.
  2203.       */
  2204.       int
  2205.       compare(size_type __pos, size_type __n1, const _CharT* __s,
  2206.               size_type __n2) const;
  2207.     };
  2208.  
  2209.   // operator+
  2210.   /**
  2211.    *  @brief  Concatenate two strings.
  2212.    *  @param __lhs  First string.
  2213.    *  @param __rhs  Last string.
  2214.    *  @return  New string with value of @a __lhs followed by @a __rhs.
  2215.    */
  2216.   template<typename _CharT, typename _Traits, typename _Alloc,
  2217.            template <typename, typename, typename> class _Base>
  2218.     __versa_string<_CharT, _Traits, _Alloc, _Base>
  2219.     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2220.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs);
  2221.  
  2222.   /**
  2223.    *  @brief  Concatenate C string and string.
  2224.    *  @param __lhs  First string.
  2225.    *  @param __rhs  Last string.
  2226.    *  @return  New string with value of @a __lhs followed by @a __rhs.
  2227.    */
  2228.   template<typename _CharT, typename _Traits, typename _Alloc,
  2229.            template <typename, typename, typename> class _Base>
  2230.     __versa_string<_CharT, _Traits, _Alloc, _Base>
  2231.     operator+(const _CharT* __lhs,
  2232.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs);
  2233.  
  2234.   /**
  2235.    *  @brief  Concatenate character and string.
  2236.    *  @param __lhs  First string.
  2237.    *  @param __rhs  Last string.
  2238.    *  @return  New string with @a __lhs followed by @a __rhs.
  2239.    */
  2240.   template<typename _CharT, typename _Traits, typename _Alloc,
  2241.            template <typename, typename, typename> class _Base>
  2242.     __versa_string<_CharT, _Traits, _Alloc, _Base>
  2243.     operator+(_CharT __lhs,
  2244.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs);
  2245.  
  2246.   /**
  2247.    *  @brief  Concatenate string and C string.
  2248.    *  @param __lhs  First string.
  2249.    *  @param __rhs  Last string.
  2250.    *  @return  New string with @a __lhs followed by @a __rhs.
  2251.    */
  2252.   template<typename _CharT, typename _Traits, typename _Alloc,
  2253.            template <typename, typename, typename> class _Base>
  2254.     __versa_string<_CharT, _Traits, _Alloc, _Base>
  2255.     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2256.               const _CharT* __rhs);
  2257.  
  2258.   /**
  2259.    *  @brief  Concatenate string and character.
  2260.    *  @param __lhs  First string.
  2261.    *  @param __rhs  Last string.
  2262.    *  @return  New string with @a __lhs followed by @a __rhs.
  2263.    */
  2264.   template<typename _CharT, typename _Traits, typename _Alloc,
  2265.            template <typename, typename, typename> class _Base>
  2266.     __versa_string<_CharT, _Traits, _Alloc, _Base>
  2267.     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2268.               _CharT __rhs);
  2269.  
  2270. #if __cplusplus >= 201103L
  2271.   template<typename _CharT, typename _Traits, typename _Alloc,
  2272.            template <typename, typename, typename> class _Base>
  2273.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2274.     operator+(__versa_string<_CharT, _Traits, _Alloc, _Base>&& __lhs,
  2275.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2276.     { return std::move(__lhs.append(__rhs)); }
  2277.  
  2278.   template<typename _CharT, typename _Traits, typename _Alloc,
  2279.            template <typename, typename, typename> class _Base>
  2280.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2281.     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2282.               __versa_string<_CharT, _Traits, _Alloc, _Base>&& __rhs)
  2283.     { return std::move(__rhs.insert(0, __lhs)); }
  2284.  
  2285.   template<typename _CharT, typename _Traits, typename _Alloc,
  2286.            template <typename, typename, typename> class _Base>
  2287.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2288.     operator+(__versa_string<_CharT, _Traits, _Alloc, _Base>&& __lhs,
  2289.               __versa_string<_CharT, _Traits, _Alloc, _Base>&& __rhs)
  2290.     {
  2291.       const auto __size = __lhs.size() + __rhs.size();
  2292.       const bool __cond = (__size > __lhs.capacity()
  2293.                            && __size <= __rhs.capacity());
  2294.       return __cond ? std::move(__rhs.insert(0, __lhs))
  2295.                     : std::move(__lhs.append(__rhs));
  2296.     }
  2297.  
  2298.   template<typename _CharT, typename _Traits, typename _Alloc,
  2299.            template <typename, typename, typename> class _Base>
  2300.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2301.     operator+(const _CharT* __lhs,
  2302.               __versa_string<_CharT, _Traits, _Alloc, _Base>&& __rhs)
  2303.     { return std::move(__rhs.insert(0, __lhs)); }
  2304.  
  2305.   template<typename _CharT, typename _Traits, typename _Alloc,
  2306.            template <typename, typename, typename> class _Base>
  2307.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2308.     operator+(_CharT __lhs,
  2309.               __versa_string<_CharT, _Traits, _Alloc, _Base>&& __rhs)
  2310.     { return std::move(__rhs.insert(0, 1, __lhs)); }
  2311.  
  2312.   template<typename _CharT, typename _Traits, typename _Alloc,
  2313.            template <typename, typename, typename> class _Base>
  2314.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2315.     operator+(__versa_string<_CharT, _Traits, _Alloc, _Base>&& __lhs,
  2316.               const _CharT* __rhs)
  2317.     { return std::move(__lhs.append(__rhs)); }
  2318.  
  2319.   template<typename _CharT, typename _Traits, typename _Alloc,
  2320.            template <typename, typename, typename> class _Base>
  2321.     inline __versa_string<_CharT, _Traits, _Alloc, _Base>
  2322.     operator+(__versa_string<_CharT, _Traits, _Alloc, _Base>&& __lhs,
  2323.               _CharT __rhs)
  2324.     { return std::move(__lhs.append(1, __rhs)); }
  2325. #endif
  2326.  
  2327.   // operator ==
  2328.   /**
  2329.    *  @brief  Test equivalence of two strings.
  2330.    *  @param __lhs  First string.
  2331.    *  @param __rhs  Second string.
  2332.    *  @return  True if @a __lhs.compare(@a __rhs) == 0.  False otherwise.
  2333.    */
  2334.   template<typename _CharT, typename _Traits, typename _Alloc,
  2335.            template <typename, typename, typename> class _Base>
  2336.     inline bool
  2337.     operator==(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2338.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2339.     { return __lhs.compare(__rhs) == 0; }
  2340.  
  2341.   template<typename _CharT,
  2342.            template <typename, typename, typename> class _Base>
  2343.     inline typename __enable_if<std::__is_char<_CharT>::__value, bool>::__type
  2344.     operator==(const __versa_string<_CharT, std::char_traits<_CharT>,
  2345.                std::allocator<_CharT>, _Base>& __lhs,
  2346.                const __versa_string<_CharT, std::char_traits<_CharT>,
  2347.                std::allocator<_CharT>, _Base>& __rhs)
  2348.     { return (__lhs.size() == __rhs.size()
  2349.               && !std::char_traits<_CharT>::compare(__lhs.data(), __rhs.data(),
  2350.                                                     __lhs.size())); }
  2351.  
  2352.   /**
  2353.    *  @brief  Test equivalence of C string and string.
  2354.    *  @param __lhs  C string.
  2355.    *  @param __rhs  String.
  2356.    *  @return  True if @a __rhs.compare(@a __lhs) == 0.  False otherwise.
  2357.    */
  2358.   template<typename _CharT, typename _Traits, typename _Alloc,
  2359.            template <typename, typename, typename> class _Base>
  2360.     inline bool
  2361.     operator==(const _CharT* __lhs,
  2362.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2363.     { return __rhs.compare(__lhs) == 0; }
  2364.  
  2365.   /**
  2366.    *  @brief  Test equivalence of string and C string.
  2367.    *  @param __lhs  String.
  2368.    *  @param __rhs  C string.
  2369.    *  @return  True if @a __lhs.compare(@a __rhs) == 0.  False otherwise.
  2370.    */
  2371.   template<typename _CharT, typename _Traits, typename _Alloc,
  2372.            template <typename, typename, typename> class _Base>
  2373.     inline bool
  2374.     operator==(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2375.                const _CharT* __rhs)
  2376.     { return __lhs.compare(__rhs) == 0; }
  2377.  
  2378.   // operator !=
  2379.   /**
  2380.    *  @brief  Test difference of two strings.
  2381.    *  @param __lhs  First string.
  2382.    *  @param __rhs  Second string.
  2383.    *  @return  True if @a __lhs.compare(@a __rhs) != 0.  False otherwise.
  2384.    */
  2385.   template<typename _CharT, typename _Traits, typename _Alloc,
  2386.            template <typename, typename, typename> class _Base>
  2387.     inline bool
  2388.     operator!=(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2389.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2390.     { return !(__lhs == __rhs); }
  2391.  
  2392.   /**
  2393.    *  @brief  Test difference of C string and string.
  2394.    *  @param __lhs  C string.
  2395.    *  @param __rhs  String.
  2396.    *  @return  True if @a __rhs.compare(@a __lhs) != 0.  False otherwise.
  2397.    */
  2398.   template<typename _CharT, typename _Traits, typename _Alloc,
  2399.            template <typename, typename, typename> class _Base>
  2400.     inline bool
  2401.     operator!=(const _CharT* __lhs,
  2402.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2403.     { return !(__lhs == __rhs); }
  2404.  
  2405.   /**
  2406.    *  @brief  Test difference of string and C string.
  2407.    *  @param __lhs  String.
  2408.    *  @param __rhs  C string.
  2409.    *  @return  True if @a __lhs.compare(@a __rhs) != 0.  False otherwise.
  2410.    */
  2411.   template<typename _CharT, typename _Traits, typename _Alloc,
  2412.            template <typename, typename, typename> class _Base>
  2413.     inline bool
  2414.     operator!=(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2415.                const _CharT* __rhs)
  2416.     { return !(__lhs == __rhs); }
  2417.  
  2418.   // operator <
  2419.   /**
  2420.    *  @brief  Test if string precedes string.
  2421.    *  @param __lhs  First string.
  2422.    *  @param __rhs  Second string.
  2423.    *  @return  True if @a __lhs precedes @a __rhs.  False otherwise.
  2424.    */
  2425.   template<typename _CharT, typename _Traits, typename _Alloc,
  2426.            template <typename, typename, typename> class _Base>
  2427.     inline bool
  2428.     operator<(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2429.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2430.     { return __lhs.compare(__rhs) < 0; }
  2431.  
  2432.   /**
  2433.    *  @brief  Test if string precedes C string.
  2434.    *  @param __lhs  String.
  2435.    *  @param __rhs  C string.
  2436.    *  @return  True if @a __lhs precedes @a __rhs.  False otherwise.
  2437.    */
  2438.   template<typename _CharT, typename _Traits, typename _Alloc,
  2439.            template <typename, typename, typename> class _Base>
  2440.     inline bool
  2441.     operator<(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2442.               const _CharT* __rhs)
  2443.     { return __lhs.compare(__rhs) < 0; }
  2444.  
  2445.   /**
  2446.    *  @brief  Test if C string precedes string.
  2447.    *  @param __lhs  C string.
  2448.    *  @param __rhs  String.
  2449.    *  @return  True if @a __lhs precedes @a __rhs.  False otherwise.
  2450.    */
  2451.   template<typename _CharT, typename _Traits, typename _Alloc,
  2452.            template <typename, typename, typename> class _Base>
  2453.     inline bool
  2454.     operator<(const _CharT* __lhs,
  2455.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2456.     { return __rhs.compare(__lhs) > 0; }
  2457.  
  2458.   // operator >
  2459.   /**
  2460.    *  @brief  Test if string follows string.
  2461.    *  @param __lhs  First string.
  2462.    *  @param __rhs  Second string.
  2463.    *  @return  True if @a __lhs follows @a __rhs.  False otherwise.
  2464.    */
  2465.   template<typename _CharT, typename _Traits, typename _Alloc,
  2466.            template <typename, typename, typename> class _Base>
  2467.     inline bool
  2468.     operator>(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2469.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2470.     { return __lhs.compare(__rhs) > 0; }
  2471.  
  2472.   /**
  2473.    *  @brief  Test if string follows C string.
  2474.    *  @param __lhs  String.
  2475.    *  @param __rhs  C string.
  2476.    *  @return  True if @a __lhs follows @a __rhs.  False otherwise.
  2477.    */
  2478.   template<typename _CharT, typename _Traits, typename _Alloc,
  2479.            template <typename, typename, typename> class _Base>
  2480.     inline bool
  2481.     operator>(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2482.               const _CharT* __rhs)
  2483.     { return __lhs.compare(__rhs) > 0; }
  2484.  
  2485.   /**
  2486.    *  @brief  Test if C string follows string.
  2487.    *  @param __lhs  C string.
  2488.    *  @param __rhs  String.
  2489.    *  @return  True if @a __lhs follows @a __rhs.  False otherwise.
  2490.    */
  2491.   template<typename _CharT, typename _Traits, typename _Alloc,
  2492.            template <typename, typename, typename> class _Base>
  2493.     inline bool
  2494.     operator>(const _CharT* __lhs,
  2495.               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2496.     { return __rhs.compare(__lhs) < 0; }
  2497.  
  2498.   // operator <=
  2499.   /**
  2500.    *  @brief  Test if string doesn't follow string.
  2501.    *  @param __lhs  First string.
  2502.    *  @param __rhs  Second string.
  2503.    *  @return  True if @a __lhs doesn't follow @a __rhs.  False otherwise.
  2504.    */
  2505.   template<typename _CharT, typename _Traits, typename _Alloc,
  2506.            template <typename, typename, typename> class _Base>
  2507.     inline bool
  2508.     operator<=(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2509.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2510.     { return __lhs.compare(__rhs) <= 0; }
  2511.  
  2512.   /**
  2513.    *  @brief  Test if string doesn't follow C string.
  2514.    *  @param __lhs  String.
  2515.    *  @param __rhs  C string.
  2516.    *  @return  True if @a __lhs doesn't follow @a __rhs.  False otherwise.
  2517.    */
  2518.   template<typename _CharT, typename _Traits, typename _Alloc,
  2519.            template <typename, typename, typename> class _Base>
  2520.     inline bool
  2521.     operator<=(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2522.                const _CharT* __rhs)
  2523.     { return __lhs.compare(__rhs) <= 0; }
  2524.  
  2525.   /**
  2526.    *  @brief  Test if C string doesn't follow string.
  2527.    *  @param __lhs  C string.
  2528.    *  @param __rhs  String.
  2529.    *  @return  True if @a __lhs doesn't follow @a __rhs.  False otherwise.
  2530.    */
  2531.   template<typename _CharT, typename _Traits, typename _Alloc,
  2532.            template <typename, typename, typename> class _Base>
  2533.     inline bool
  2534.     operator<=(const _CharT* __lhs,
  2535.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2536.     { return __rhs.compare(__lhs) >= 0; }
  2537.  
  2538.   // operator >=
  2539.   /**
  2540.    *  @brief  Test if string doesn't precede string.
  2541.    *  @param __lhs  First string.
  2542.    *  @param __rhs  Second string.
  2543.    *  @return  True if @a __lhs doesn't precede @a __rhs.  False otherwise.
  2544.    */
  2545.   template<typename _CharT, typename _Traits, typename _Alloc,
  2546.            template <typename, typename, typename> class _Base>
  2547.     inline bool
  2548.     operator>=(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2549.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2550.     { return __lhs.compare(__rhs) >= 0; }
  2551.  
  2552.   /**
  2553.    *  @brief  Test if string doesn't precede C string.
  2554.    *  @param __lhs  String.
  2555.    *  @param __rhs  C string.
  2556.    *  @return  True if @a __lhs doesn't precede @a __rhs.  False otherwise.
  2557.    */
  2558.   template<typename _CharT, typename _Traits, typename _Alloc,
  2559.            template <typename, typename, typename> class _Base>
  2560.     inline bool
  2561.     operator>=(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2562.                const _CharT* __rhs)
  2563.     { return __lhs.compare(__rhs) >= 0; }
  2564.  
  2565.   /**
  2566.    *  @brief  Test if C string doesn't precede string.
  2567.    *  @param __lhs  C string.
  2568.    *  @param __rhs  String.
  2569.    *  @return  True if @a __lhs doesn't precede @a __rhs.  False otherwise.
  2570.    */
  2571.   template<typename _CharT, typename _Traits, typename _Alloc,
  2572.            template <typename, typename, typename> class _Base>
  2573.     inline bool
  2574.     operator>=(const _CharT* __lhs,
  2575.                const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2576.     { return __rhs.compare(__lhs) <= 0; }
  2577.  
  2578.   /**
  2579.    *  @brief  Swap contents of two strings.
  2580.    *  @param __lhs  First string.
  2581.    *  @param __rhs  Second string.
  2582.    *
  2583.    *  Exchanges the contents of @a __lhs and @a __rhs in constant time.
  2584.    */
  2585.   template<typename _CharT, typename _Traits, typename _Alloc,
  2586.            template <typename, typename, typename> class _Base>
  2587.     inline void
  2588.     swap(__versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
  2589.          __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
  2590.     { __lhs.swap(__rhs); }
  2591.  
  2592. _GLIBCXX_END_NAMESPACE_VERSION
  2593. } // namespace
  2594.  
  2595. namespace std _GLIBCXX_VISIBILITY(default)
  2596. {
  2597. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  2598.  
  2599.   /**
  2600.    *  @brief  Read stream into a string.
  2601.    *  @param __is  Input stream.
  2602.    *  @param __str  Buffer to store into.
  2603.    *  @return  Reference to the input stream.
  2604.    *
  2605.    *  Stores characters from @a __is into @a __str until whitespace is
  2606.    *  found, the end of the stream is encountered, or str.max_size()
  2607.    *  is reached.  If is.width() is non-zero, that is the limit on the
  2608.    *  number of characters stored into @a __str.  Any previous
  2609.    *  contents of @a __str are erased.
  2610.    */
  2611.   template<typename _CharT, typename _Traits, typename _Alloc,
  2612.            template <typename, typename, typename> class _Base>
  2613.     basic_istream<_CharT, _Traits>&
  2614.     operator>>(basic_istream<_CharT, _Traits>& __is,
  2615.                __gnu_cxx::__versa_string<_CharT, _Traits,
  2616.                                          _Alloc, _Base>& __str);
  2617.  
  2618.   /**
  2619.    *  @brief  Write string to a stream.
  2620.    *  @param __os  Output stream.
  2621.    *  @param __str  String to write out.
  2622.    *  @return  Reference to the output stream.
  2623.    *
  2624.    *  Output characters of @a __str into os following the same rules as for
  2625.    *  writing a C string.
  2626.    */
  2627.   template<typename _CharT, typename _Traits, typename _Alloc,
  2628.            template <typename, typename, typename> class _Base>
  2629.     inline basic_ostream<_CharT, _Traits>&
  2630.     operator<<(basic_ostream<_CharT, _Traits>& __os,
  2631.                const __gnu_cxx::__versa_string<_CharT, _Traits, _Alloc,
  2632.                _Base>& __str)
  2633.     {
  2634.       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  2635.       // 586. string inserter not a formatted function
  2636.       return __ostream_insert(__os, __str.data(), __str.size());
  2637.     }
  2638.  
  2639.   /**
  2640.    *  @brief  Read a line from stream into a string.
  2641.    *  @param __is  Input stream.
  2642.    *  @param __str  Buffer to store into.
  2643.    *  @param __delim  Character marking end of line.
  2644.    *  @return  Reference to the input stream.
  2645.    *
  2646.    *  Stores characters from @a __is into @a __str until @a __delim is
  2647.    *  found, the end of the stream is encountered, or str.max_size()
  2648.    *  is reached.  If is.width() is non-zero, that is the limit on the
  2649.    *  number of characters stored into @a __str.  Any previous
  2650.    *  contents of @a __str are erased.  If @a delim was encountered,
  2651.    *  it is extracted but not stored into @a __str.
  2652.    */
  2653.   template<typename _CharT, typename _Traits, typename _Alloc,
  2654.            template <typename, typename, typename> class _Base>
  2655.     basic_istream<_CharT, _Traits>&
  2656.     getline(basic_istream<_CharT, _Traits>& __is,
  2657.             __gnu_cxx::__versa_string<_CharT, _Traits, _Alloc, _Base>& __str,
  2658.             _CharT __delim);
  2659.  
  2660.   /**
  2661.    *  @brief  Read a line from stream into a string.
  2662.    *  @param __is  Input stream.
  2663.    *  @param __str  Buffer to store into.
  2664.    *  @return  Reference to the input stream.
  2665.    *
  2666.    *  Stores characters from is into @a __str until &apos;\n&apos; is
  2667.    *  found, the end of the stream is encountered, or str.max_size()
  2668.    *  is reached.  If is.width() is non-zero, that is the limit on the
  2669.    *  number of characters stored into @a __str.  Any previous
  2670.    *  contents of @a __str are erased.  If end of line was
  2671.    *  encountered, it is extracted but not stored into @a __str.
  2672.    */
  2673.   template<typename _CharT, typename _Traits, typename _Alloc,
  2674.            template <typename, typename, typename> class _Base>
  2675.     inline basic_istream<_CharT, _Traits>&
  2676.     getline(basic_istream<_CharT, _Traits>& __is,
  2677.             __gnu_cxx::__versa_string<_CharT, _Traits, _Alloc, _Base>& __str)
  2678.     { return getline(__is, __str, __is.widen('\n')); }      
  2679.  
  2680. _GLIBCXX_END_NAMESPACE_VERSION
  2681. } // namespace
  2682.  
  2683. #if ((__cplusplus >= 201103L) && defined(_GLIBCXX_USE_C99))
  2684.  
  2685. #include <ext/string_conversions.h>
  2686.  
  2687. namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  2688. {
  2689. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  2690.  
  2691.   // 21.4 Numeric Conversions [string.conversions].
  2692.   inline int
  2693.   stoi(const __vstring& __str, std::size_t* __idx = 0, int __base = 10)
  2694.   { return __gnu_cxx::__stoa<long, int>(&std::strtol, "stoi", __str.c_str(),
  2695.                                         __idx, __base); }
  2696.  
  2697.   inline long
  2698.   stol(const __vstring& __str, std::size_t* __idx = 0, int __base = 10)
  2699.   { return __gnu_cxx::__stoa(&std::strtol, "stol", __str.c_str(),
  2700.                              __idx, __base); }
  2701.  
  2702.   inline unsigned long
  2703.   stoul(const __vstring& __str, std::size_t* __idx = 0, int __base = 10)
  2704.   { return __gnu_cxx::__stoa(&std::strtoul, "stoul", __str.c_str(),
  2705.                              __idx, __base); }
  2706.  
  2707.   inline long long
  2708.   stoll(const __vstring& __str, std::size_t* __idx = 0, int __base = 10)
  2709.   { return __gnu_cxx::__stoa(&std::strtoll, "stoll", __str.c_str(),
  2710.                              __idx, __base); }
  2711.  
  2712.   inline unsigned long long
  2713.   stoull(const __vstring& __str, std::size_t* __idx, int __base = 10)
  2714.   { return __gnu_cxx::__stoa(&std::strtoull, "stoull", __str.c_str(),
  2715.                              __idx, __base); }
  2716.  
  2717.   // NB: strtof vs strtod.
  2718.   inline float
  2719.   stof(const __vstring& __str, std::size_t* __idx = 0)
  2720.   { return __gnu_cxx::__stoa(&std::strtof, "stof", __str.c_str(), __idx); }
  2721.  
  2722.   inline double
  2723.   stod(const __vstring& __str, std::size_t* __idx = 0)
  2724.   { return __gnu_cxx::__stoa(&std::strtod, "stod", __str.c_str(), __idx); }
  2725.  
  2726.   inline long double
  2727.   stold(const __vstring& __str, std::size_t* __idx = 0)
  2728.   { return __gnu_cxx::__stoa(&std::strtold, "stold", __str.c_str(), __idx); }
  2729.  
  2730.   // NB: (v)snprintf vs sprintf.
  2731.  
  2732.   // DR 1261.
  2733.   inline __vstring
  2734.   to_string(int __val)
  2735.   { return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf, 4 * sizeof(int),
  2736.                                               "%d", __val); }
  2737.  
  2738.   inline __vstring
  2739.   to_string(unsigned __val)
  2740.   { return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf,
  2741.                                               4 * sizeof(unsigned),
  2742.                                               "%u", __val); }
  2743.  
  2744.   inline __vstring
  2745.   to_string(long __val)
  2746.   { return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf,
  2747.                                               4 * sizeof(long),
  2748.                                               "%ld", __val); }
  2749.  
  2750.   inline __vstring
  2751.   to_string(unsigned long __val)
  2752.   { return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf,
  2753.                                               4 * sizeof(unsigned long),
  2754.                                               "%lu", __val); }
  2755.  
  2756.  
  2757.   inline __vstring
  2758.   to_string(long long __val)
  2759.   { return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf,
  2760.                                               4 * sizeof(long long),
  2761.                                               "%lld", __val); }
  2762.  
  2763.   inline __vstring
  2764.   to_string(unsigned long long __val)
  2765.   { return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf,
  2766.                                               4 * sizeof(unsigned long long),
  2767.                                               "%llu", __val); }
  2768.  
  2769.   inline __vstring
  2770.   to_string(float __val)
  2771.   {
  2772.     const int __n = __numeric_traits<float>::__max_exponent10 + 20;
  2773.     return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf, __n,
  2774.                                               "%f", __val);
  2775.   }
  2776.  
  2777.   inline __vstring
  2778.   to_string(double __val)
  2779.   {
  2780.     const int __n = __numeric_traits<double>::__max_exponent10 + 20;
  2781.     return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf, __n,
  2782.                                               "%f", __val);
  2783.   }
  2784.  
  2785.   inline __vstring
  2786.   to_string(long double __val)
  2787.   {
  2788.     const int __n = __numeric_traits<long double>::__max_exponent10 + 20;
  2789.     return __gnu_cxx::__to_xstring<__vstring>(&std::vsnprintf, __n,
  2790.                                               "%Lf", __val);
  2791.   }
  2792.  
  2793. #ifdef _GLIBCXX_USE_WCHAR_T
  2794.   inline int
  2795.   stoi(const __wvstring& __str, std::size_t* __idx = 0, int __base = 10)
  2796.   { return __gnu_cxx::__stoa<long, int>(&std::wcstol, "stoi", __str.c_str(),
  2797.                                         __idx, __base); }
  2798.  
  2799.   inline long
  2800.   stol(const __wvstring& __str, std::size_t* __idx = 0, int __base = 10)
  2801.   { return __gnu_cxx::__stoa(&std::wcstol, "stol", __str.c_str(),
  2802.                              __idx, __base); }
  2803.  
  2804.   inline unsigned long
  2805.   stoul(const __wvstring& __str, std::size_t* __idx = 0, int __base = 10)
  2806.   { return __gnu_cxx::__stoa(&std::wcstoul, "stoul", __str.c_str(),
  2807.                              __idx, __base); }
  2808.  
  2809.   inline long long
  2810.   stoll(const __wvstring& __str, std::size_t* __idx = 0, int __base = 10)
  2811.   { return __gnu_cxx::__stoa(&std::wcstoll, "stoll", __str.c_str(),
  2812.                              __idx, __base); }
  2813.  
  2814.   inline unsigned long long
  2815.   stoull(const __wvstring& __str, std::size_t* __idx = 0, int __base = 10)
  2816.   { return __gnu_cxx::__stoa(&std::wcstoull, "stoull", __str.c_str(),
  2817.                              __idx, __base); }
  2818.  
  2819.   // NB: wcstof vs wcstod.
  2820.   inline float
  2821.   stof(const __wvstring& __str, std::size_t* __idx = 0)
  2822.   { return __gnu_cxx::__stoa(&std::wcstof, "stof", __str.c_str(), __idx); }
  2823.  
  2824.   inline double
  2825.   stod(const __wvstring& __str, std::size_t* __idx = 0)
  2826.   { return __gnu_cxx::__stoa(&std::wcstod, "stod", __str.c_str(), __idx); }
  2827.  
  2828.   inline long double
  2829.   stold(const __wvstring& __str, std::size_t* __idx = 0)
  2830.   { return __gnu_cxx::__stoa(&std::wcstold, "stold", __str.c_str(), __idx); }
  2831.  
  2832. #ifndef _GLIBCXX_HAVE_BROKEN_VSWPRINTF
  2833.   // DR 1261.
  2834.   inline __wvstring
  2835.   to_wstring(int __val)
  2836.   { return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf,
  2837.                                                4 * sizeof(int),
  2838.                                                L"%d", __val); }
  2839.  
  2840.   inline __wvstring
  2841.   to_wstring(unsigned __val)
  2842.   { return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf,
  2843.                                                4 * sizeof(unsigned),
  2844.                                                L"%u", __val); }
  2845.  
  2846.   inline __wvstring
  2847.   to_wstring(long __val)
  2848.   { return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf,
  2849.                                                4 * sizeof(long),
  2850.                                                L"%ld", __val); }
  2851.  
  2852.   inline __wvstring
  2853.   to_wstring(unsigned long __val)
  2854.   { return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf,
  2855.                                                4 * sizeof(unsigned long),
  2856.                                                L"%lu", __val); }
  2857.  
  2858.   inline __wvstring
  2859.   to_wstring(long long __val)
  2860.   { return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf,
  2861.                                                4 * sizeof(long long),
  2862.                                                L"%lld", __val); }
  2863.  
  2864.   inline __wvstring
  2865.   to_wstring(unsigned long long __val)
  2866.   { return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf,
  2867.                                                4 * sizeof(unsigned long long),
  2868.                                                L"%llu", __val); }
  2869.  
  2870.   inline __wvstring
  2871.   to_wstring(float __val)
  2872.   {
  2873.     const int __n = __numeric_traits<float>::__max_exponent10 + 20;
  2874.     return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf, __n,
  2875.                                                L"%f", __val);
  2876.   }
  2877.  
  2878.   inline __wvstring
  2879.   to_wstring(double __val)
  2880.   {
  2881.     const int __n = __numeric_traits<double>::__max_exponent10 + 20;
  2882.     return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf, __n,
  2883.                                                L"%f", __val);
  2884.   }
  2885.  
  2886.   inline __wvstring
  2887.   to_wstring(long double __val)
  2888.   {
  2889.     const int __n = __numeric_traits<long double>::__max_exponent10 + 20;
  2890.     return __gnu_cxx::__to_xstring<__wvstring>(&std::vswprintf, __n,
  2891.                                                L"%Lf", __val);
  2892.   }
  2893. #endif
  2894. #endif
  2895.  
  2896. _GLIBCXX_END_NAMESPACE_VERSION
  2897. } // namespace
  2898.  
  2899. #endif
  2900.  
  2901. #if __cplusplus >= 201103L
  2902.  
  2903. #include <bits/functional_hash.h>
  2904.  
  2905. namespace std _GLIBCXX_VISIBILITY(default)
  2906. {
  2907. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  2908.  
  2909.   /// std::hash specialization for __vstring.
  2910.   template<>
  2911.     struct hash<__gnu_cxx::__vstring>
  2912.     : public __hash_base<size_t, __gnu_cxx::__vstring>
  2913.     {
  2914.       size_t
  2915.       operator()(const __gnu_cxx::__vstring& __s) const noexcept
  2916.       { return std::_Hash_impl::hash(__s.data(), __s.length()); }
  2917.     };
  2918.  
  2919. #ifdef _GLIBCXX_USE_WCHAR_T
  2920.   /// std::hash specialization for __wvstring.
  2921.   template<>
  2922.     struct hash<__gnu_cxx::__wvstring>
  2923.     : public __hash_base<size_t, __gnu_cxx::__wvstring>
  2924.     {
  2925.       size_t
  2926.       operator()(const __gnu_cxx::__wvstring& __s) const noexcept
  2927.       { return std::_Hash_impl::hash(__s.data(),
  2928.                                      __s.length() * sizeof(wchar_t)); }
  2929.     };
  2930. #endif
  2931.  
  2932. #ifdef _GLIBCXX_USE_C99_STDINT_TR1
  2933.   /// std::hash specialization for __u16vstring.
  2934.   template<>
  2935.     struct hash<__gnu_cxx::__u16vstring>
  2936.     : public __hash_base<size_t, __gnu_cxx::__u16vstring>
  2937.     {
  2938.       size_t
  2939.       operator()(const __gnu_cxx::__u16vstring& __s) const noexcept
  2940.       { return std::_Hash_impl::hash(__s.data(),
  2941.                                      __s.length() * sizeof(char16_t)); }
  2942.     };
  2943.  
  2944.   /// std::hash specialization for __u32vstring.
  2945.   template<>
  2946.     struct hash<__gnu_cxx::__u32vstring>
  2947.     : public __hash_base<size_t, __gnu_cxx::__u32vstring>
  2948.     {
  2949.       size_t
  2950.       operator()(const __gnu_cxx::__u32vstring& __s) const noexcept
  2951.       { return std::_Hash_impl::hash(__s.data(),
  2952.                                      __s.length() * sizeof(char32_t)); }
  2953.     };
  2954. #endif
  2955.  
  2956. _GLIBCXX_END_NAMESPACE_VERSION
  2957. } // namespace
  2958.  
  2959. #endif // C++11
  2960.  
  2961. #include "vstring.tcc"
  2962.  
  2963. #endif /* _VSTRING_H */
  2964.