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// Versatile string utility -*- C++ -*-

// Copyright (C) 2005-2015 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// .

/** @file ext/vstring_util.h

 *  This is an internal header file, included by other library headers.

 *  Do not attempt to use it directly. @headername{ext/vstring.h}

 */

#ifndef _VSTRING_UTIL_H

#define _VSTRING_UTIL_H 1

#pragma GCC system_header

#include 

#include 

#include   // For less

#include 

#include 

#include 

#include 

#include 

#include 

#include 

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  template

    struct __vstring_utility

    {

      typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;

      typedef _Traits					    traits_type;

      typedef typename _Traits::char_type		    value_type;

      typedef typename _CharT_alloc_type::size_type	    size_type;

      typedef typename _CharT_alloc_type::difference_type   difference_type;

      typedef typename _CharT_alloc_type::pointer	    pointer;

      typedef typename _CharT_alloc_type::const_pointer	    const_pointer;

      // For __sso_string.

      typedef __gnu_cxx::

      __normal_iterator

			__versa_string<_CharT, _Traits, _Alloc,

				       __sso_string_base> >

	__sso_iterator;

      typedef __gnu_cxx::

      __normal_iterator

			__versa_string<_CharT, _Traits, _Alloc,

				       __sso_string_base> >

	__const_sso_iterator;

      // For __rc_string.

      typedef __gnu_cxx::

      __normal_iterator

			__versa_string<_CharT, _Traits, _Alloc,

				       __rc_string_base> >

	__rc_iterator;

      typedef __gnu_cxx::

      __normal_iterator

			__versa_string<_CharT, _Traits, _Alloc,

				       __rc_string_base> >

	__const_rc_iterator;

      // NB:  When the allocator is empty, deriving from it saves space

      // (http://www.cantrip.org/emptyopt.html).

      template

	struct _Alloc_hider

	: public _Alloc1

	{

	  _Alloc_hider(_CharT* __ptr)

	  : _Alloc1(), _M_p(__ptr) { }

	  _Alloc_hider(const _Alloc1& __a, _CharT* __ptr)

	  : _Alloc1(__a), _M_p(__ptr) { }

	  _CharT*  _M_p; // The actual data.

	};

      // When __n = 1 way faster than the general multichar

      // traits_type::copy/move/assign.

      static void

      _S_copy(_CharT* __d, const _CharT* __s, size_type __n)

      {

	if (__n == 1)

	  traits_type::assign(*__d, *__s);

	else

	  traits_type::copy(__d, __s, __n);

      }

      static void

      _S_move(_CharT* __d, const _CharT* __s, size_type __n)

      {

	if (__n == 1)

	  traits_type::assign(*__d, *__s);

	else

	  traits_type::move(__d, __s, __n);

      }

      static void

      _S_assign(_CharT* __d, size_type __n, _CharT __c)

      {

	if (__n == 1)

	  traits_type::assign(*__d, __c);

	else

	  traits_type::assign(__d, __n, __c);

      }

      // _S_copy_chars is a separate template to permit specialization

      // to optimize for the common case of pointers as iterators.

      template

	static void

	_S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)

	{

	  for (; __k1 != __k2; ++__k1, ++__p)

	    traits_type::assign(*__p, *__k1); // These types are off.

	}

      static void

      _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, __const_sso_iterator __k1,

		    __const_sso_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, __const_rc_iterator __k1,

		    __const_rc_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)

      { _S_copy(__p, __k1, __k2 - __k1); }

      static void

      _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)

      { _S_copy(__p, __k1, __k2 - __k1); }

      static int

      _S_compare(size_type __n1, size_type __n2)

      {

	const difference_type __d = difference_type(__n1 - __n2);

	if (__d > __numeric_traits_integer::__max)

	  return __numeric_traits_integer::__max;

	else if (__d < __numeric_traits_integer::__min)

	  return __numeric_traits_integer::__min;

	else

	  return int(__d);

      }

    };

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#endif /* _VSTRING_UTIL_H */