11.2.0/ext/memory

// Memory extensions -*- C++ -*-

// Copyright (C) 2002-2021 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
// <http://www.gnu.org/licenses/>.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file ext/memory
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset).
 */

#ifndef _EXT_MEMORY
#define _EXT_MEMORY 1

#pragma GCC system_header

#include <memory>
#include <bits/stl_tempbuf.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  using std::_Temporary_buffer;

  template<typename _InputIter, typename _Size, typename _ForwardIter>
    std::pair<_InputIter, _ForwardIter>
    __uninitialized_copy_n(_InputIter __first, _Size __count,
                           _ForwardIter __result, std::input_iterator_tag)
    {
      _ForwardIter __cur = __result;
      __try
        {
          for (; __count > 0 ; --__count, ++__first, ++__cur)
            std::_Construct(&*__cur, *__first);
          return std::pair<_InputIter, _ForwardIter>(__first, __cur);
        }
      __catch(...)
        {
          std::_Destroy(__result, __cur);
          __throw_exception_again;
        }
    }

  template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
    inline std::pair<_RandomAccessIter, _ForwardIter>
    __uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
                           _ForwardIter __result,
                           std::random_access_iterator_tag)
    {
      _RandomAccessIter __last = __first + __count;
      return (std::pair<_RandomAccessIter, _ForwardIter>
              (__last, std::uninitialized_copy(__first, __last, __result)));
    }

  template<typename _InputIter, typename _Size, typename _ForwardIter>
    inline std::pair<_InputIter, _ForwardIter>
    __uninitialized_copy_n(_InputIter __first, _Size __count,
                           _ForwardIter __result)
    {
      return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
          std::__iterator_category(__first));
    }

  /**
   *  @brief Copies the range [first,last) into result.
   *  @param  __first  An input iterator.
   *  @param  __count  Length
   *  @param  __result An output iterator.
   *  @return   __result + (__first + __count)
   *  @ingroup SGIextensions
   *
   *  Like copy(), but does not require an initialized output range.
  */
  template<typename _InputIter, typename _Size, typename _ForwardIter>
    inline std::pair<_InputIter, _ForwardIter>
    uninitialized_copy_n(_InputIter __first, _Size __count,
                         _ForwardIter __result)
    {
      return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
          std::__iterator_category(__first));
    }


  // An alternative version of uninitialized_copy_n that constructs
  // and destroys objects with a user-provided allocator.
  template<typename _InputIter, typename _Size, typename _ForwardIter,
           typename _Allocator>
    std::pair<_InputIter, _ForwardIter>
    __uninitialized_copy_n_a(_InputIter __first, _Size __count,
                             _ForwardIter __result,
                             _Allocator __alloc)
    {
      _ForwardIter __cur = __result;
      __try
        {
          for (; __count > 0 ; --__count, ++__first, ++__cur)
            __alloc.construct(&*__cur, *__first);
          return std::pair<_InputIter, _ForwardIter>(__first, __cur);
        }
      __catch(...)
        {
          std::_Destroy(__result, __cur, __alloc);
          __throw_exception_again;
        }
    }

  template<typename _InputIter, typename _Size, typename _ForwardIter,
           typename _Tp>
    inline std::pair<_InputIter, _ForwardIter>
    __uninitialized_copy_n_a(_InputIter __first, _Size __count,
                             _ForwardIter __result,
                             std::allocator<_Tp>)
    {
      return __gnu_cxx::uninitialized_copy_n(__first, __count, __result);
    }

  /**
   *  This class provides similar behavior and semantics of the standard
   *  functions get_temporary_buffer() and return_temporary_buffer(), but
   *  encapsulated in a type vaguely resembling a standard container.
   *
   *  By default, a temporary_buffer<Iter> stores space for objects of
   *  whatever type the Iter iterator points to.  It is constructed from a
   *  typical [first,last) range, and provides the begin(), end(), size()
   *  functions, as well as requested_size().  For non-trivial types, copies
   *  of *first will be used to initialize the storage.
   *
   *  @c malloc is used to obtain underlying storage.
   *
   *  Like get_temporary_buffer(), not all the requested memory may be
   *  available.  Ideally, the created buffer will be large enough to hold a
   *  copy of [first,last), but if size() is less than requested_size(),
   *  then this didn't happen.
   *
   *  @ingroup SGIextensions
  */
  template <class _ForwardIterator, class _Tp
            = typename std::iterator_traits<_ForwardIterator>::value_type >
    struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
    {
      /// Requests storage large enough to hold a copy of [first,last).
      temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
      : _Temporary_buffer<_ForwardIterator, _Tp>(__first,
                                                 std::distance(__first, __last))
      { }
      
      /// Destroys objects and frees storage.
      ~temporary_buffer() { }
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

Revision:	1166
Committed:	Tue Oct 26 14:22:36 2021 UTC (4 years ago) by rossy
File size:	7173 byte(s)
Log Message:	Daodan: Replace MinGW build env with an up-to-date MSYS2 env
#	Content
1	// Memory extensions -- C++ --
2
3	// Copyright (C) 2002-2021 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	/*
26	*
27	* Copyright (c) 1994
28	* Hewlett-Packard Company
29	*
30	* Permission to use, copy, modify, distribute and sell this software
31	* and its documentation for any purpose is hereby granted without fee,
32	* provided that the above copyright notice appear in all copies and
33	* that both that copyright notice and this permission notice appear
34	* in supporting documentation. Hewlett-Packard Company makes no
35	* representations about the suitability of this software for any
36	* purpose. It is provided "as is" without express or implied warranty.
37	*
38	*
39	* Copyright (c) 1996
40	* Silicon Graphics Computer Systems, Inc.
41	*
42	* Permission to use, copy, modify, distribute and sell this software
43	* and its documentation for any purpose is hereby granted without fee,
44	* provided that the above copyright notice appear in all copies and
45	* that both that copyright notice and this permission notice appear
46	* in supporting documentation. Silicon Graphics makes no
47	* representations about the suitability of this software for any
48	* purpose. It is provided "as is" without express or implied warranty.
49	*/
50
51	/** @file ext/memory
52	* This file is a GNU extension to the Standard C++ Library (possibly
53	* containing extensions from the HP/SGI STL subset).
54	*/
55
56	#ifndef _EXT_MEMORY
57	#define _EXT_MEMORY 1
58
59	#pragma GCC system_header
60
61	#include <memory>
62	#include <bits/stl_tempbuf.h>
63
64	namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
65	{
66	_GLIBCXX_BEGIN_NAMESPACE_VERSION
67
68	using std::_Temporary_buffer;
69
70	template<typename _InputIter, typename _Size, typename _ForwardIter>
71	std::pair<_InputIter, _ForwardIter>
72	__uninitialized_copy_n(_InputIter __first, _Size __count,
73	_ForwardIter __result, std::input_iterator_tag)
74	{
75	_ForwardIter __cur = __result;
76	__try
77	{
78	for (; __count > 0 ; --__count, ++__first, ++__cur)
79	std::_Construct(&__cur, __first);
80	return std::pair<_InputIter, _ForwardIter>(__first, __cur);
81	}
82	__catch(...)
83	{
84	std::_Destroy(__result, __cur);
85	__throw_exception_again;
86	}
87	}
88
89	template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
90	inline std::pair<_RandomAccessIter, _ForwardIter>
91	__uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
92	_ForwardIter __result,
93	std::random_access_iterator_tag)
94	{
95	_RandomAccessIter __last = __first + __count;
96	return (std::pair<_RandomAccessIter, _ForwardIter>
97	(__last, std::uninitialized_copy(__first, __last, __result)));
98	}
99
100	template<typename _InputIter, typename _Size, typename _ForwardIter>
101	inline std::pair<_InputIter, _ForwardIter>
102	__uninitialized_copy_n(_InputIter __first, _Size __count,
103	_ForwardIter __result)
104	{
105	return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
106	std::__iterator_category(__first));
107	}
108
109	/**
110	* @brief Copies the range [first,last) into result.
111	* @param __first An input iterator.
112	* @param __count Length
113	* @param __result An output iterator.
114	* @return __result + (__first + __count)
115	* @ingroup SGIextensions
116	*
117	* Like copy(), but does not require an initialized output range.
118	*/
119	template<typename _InputIter, typename _Size, typename _ForwardIter>
120	inline std::pair<_InputIter, _ForwardIter>
121	uninitialized_copy_n(_InputIter __first, _Size __count,
122	_ForwardIter __result)
123	{
124	return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
125	std::__iterator_category(__first));
126	}
127
128
129	// An alternative version of uninitialized_copy_n that constructs
130	// and destroys objects with a user-provided allocator.
131	template<typename _InputIter, typename _Size, typename _ForwardIter,
132	typename _Allocator>
133	std::pair<_InputIter, _ForwardIter>
134	__uninitialized_copy_n_a(_InputIter __first, _Size __count,
135	_ForwardIter __result,
136	_Allocator __alloc)
137	{
138	_ForwardIter __cur = __result;
139	__try
140	{
141	for (; __count > 0 ; --__count, ++__first, ++__cur)
142	__alloc.construct(&__cur, __first);
143	return std::pair<_InputIter, _ForwardIter>(__first, __cur);
144	}
145	__catch(...)
146	{
147	std::_Destroy(__result, __cur, __alloc);
148	__throw_exception_again;
149	}
150	}
151
152	template<typename _InputIter, typename _Size, typename _ForwardIter,
153	typename _Tp>
154	inline std::pair<_InputIter, _ForwardIter>
155	__uninitialized_copy_n_a(_InputIter __first, _Size __count,
156	_ForwardIter __result,
157	std::allocator<_Tp>)
158	{
159	return __gnu_cxx::uninitialized_copy_n(__first, __count, __result);
160	}
161
162	/**
163	* This class provides similar behavior and semantics of the standard
164	* functions get_temporary_buffer() and return_temporary_buffer(), but
165	* encapsulated in a type vaguely resembling a standard container.
166	*
167	* By default, a temporary_buffer<Iter> stores space for objects of
168	* whatever type the Iter iterator points to. It is constructed from a
169	* typical [first,last) range, and provides the begin(), end(), size()
170	* functions, as well as requested_size(). For non-trivial types, copies
171	* of *first will be used to initialize the storage.
172	*
173	* @c malloc is used to obtain underlying storage.
174	*
175	* Like get_temporary_buffer(), not all the requested memory may be
176	* available. Ideally, the created buffer will be large enough to hold a
177	* copy of [first,last), but if size() is less than requested_size(),
178	* then this didn't happen.
179	*
180	* @ingroup SGIextensions
181	*/
182	template <class _ForwardIterator, class _Tp
183	= typename std::iterator_traits<_ForwardIterator>::value_type >
184	struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
185	{
186	/// Requests storage large enough to hold a copy of [first,last).
187	temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
188	: _Temporary_buffer<_ForwardIterator, _Tp>(__first,
189	std::distance(__first, __last))
190	{ }
191
192	/// Destroys objects and frees storage.
193	~temporary_buffer() { }
194	};
195
196	_GLIBCXX_END_NAMESPACE_VERSION
197	} // namespace
198
199	#endif
200