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  1. // Allocator that wraps operator new -*- C++ -*-
  2.  
  3. // Copyright (C) 2001-2013 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/new_allocator.h
  26.  *  This file is a GNU extension to the Standard C++ Library.
  27.  */
  28.  
  29. #ifndef _NEW_ALLOCATOR_H
  30. #define _NEW_ALLOCATOR_H 1
  31.  
  32. #include <bits/c++config.h>
  33. #include <new>
  34. #include <bits/functexcept.h>
  35. #include <bits/move.h>
  36. #if __cplusplus >= 201103L
  37. #include <type_traits>
  38. #endif
  39.  
  40. namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  41. {
  42. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  43.  
  44.   using std::size_t;
  45.   using std::ptrdiff_t;
  46.  
  47.   /**
  48.    *  @brief  An allocator that uses global new, as per [20.4].
  49.    *  @ingroup allocators
  50.    *
  51.    *  This is precisely the allocator defined in the C++ Standard.
  52.    *    - all allocation calls operator new
  53.    *    - all deallocation calls operator delete
  54.    *
  55.    *  @tparam  _Tp  Type of allocated object.
  56.    */
  57.   template<typename _Tp>
  58.     class new_allocator
  59.     {
  60.     public:
  61.       typedef size_t     size_type;
  62.       typedef ptrdiff_t  difference_type;
  63.       typedef _Tp*       pointer;
  64.       typedef const _Tp* const_pointer;
  65.       typedef _Tp&       reference;
  66.       typedef const _Tp& const_reference;
  67.       typedef _Tp        value_type;
  68.  
  69.       template<typename _Tp1>
  70.         struct rebind
  71.         { typedef new_allocator<_Tp1> other; };
  72.  
  73. #if __cplusplus >= 201103L
  74.       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  75.       // 2103. propagate_on_container_move_assignment
  76.       typedef std::true_type propagate_on_container_move_assignment;
  77. #endif
  78.  
  79.       new_allocator() _GLIBCXX_USE_NOEXCEPT { }
  80.  
  81.       new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }
  82.  
  83.       template<typename _Tp1>
  84.         new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
  85.  
  86.       ~new_allocator() _GLIBCXX_USE_NOEXCEPT { }
  87.  
  88.       pointer
  89.       address(reference __x) const _GLIBCXX_NOEXCEPT
  90.       { return std::__addressof(__x); }
  91.  
  92.       const_pointer
  93.       address(const_reference __x) const _GLIBCXX_NOEXCEPT
  94.       { return std::__addressof(__x); }
  95.  
  96.       // NB: __n is permitted to be 0.  The C++ standard says nothing
  97.       // about what the return value is when __n == 0.
  98.       pointer
  99.       allocate(size_type __n, const void* = 0)
  100.       {
  101.         if (__n > this->max_size())
  102.           std::__throw_bad_alloc();
  103.  
  104.         return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
  105.       }
  106.  
  107.       // __p is not permitted to be a null pointer.
  108.       void
  109.       deallocate(pointer __p, size_type)
  110.       { ::operator delete(__p); }
  111.  
  112.       size_type
  113.       max_size() const _GLIBCXX_USE_NOEXCEPT
  114.       { return size_t(-1) / sizeof(_Tp); }
  115.  
  116. #if __cplusplus >= 201103L
  117.       template<typename _Up, typename... _Args>
  118.         void
  119.         construct(_Up* __p, _Args&&... __args)
  120.         { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
  121.  
  122.       template<typename _Up>
  123.         void
  124.         destroy(_Up* __p) { __p->~_Up(); }
  125. #else
  126.       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  127.       // 402. wrong new expression in [some_] allocator::construct
  128.       void
  129.       construct(pointer __p, const _Tp& __val)
  130.       { ::new((void *)__p) _Tp(__val); }
  131.  
  132.       void
  133.       destroy(pointer __p) { __p->~_Tp(); }
  134. #endif
  135.     };
  136.  
  137.   template<typename _Tp>
  138.     inline bool
  139.     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
  140.     { return true; }
  141.  
  142.   template<typename _Tp>
  143.     inline bool
  144.     operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
  145.     { return false; }
  146.  
  147. _GLIBCXX_END_NAMESPACE_VERSION
  148. } // namespace
  149.  
  150. #endif
  151.