libstdc++

ext/memory
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1 // Memory extensions -*- C++ -*-
2
3 // Copyright (C) 2002-2013 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 /*
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::ptrdiff_t;
69 using std::pair;
70 using std::__iterator_category;
71 using std::_Temporary_buffer;
72
73 template<typename _InputIter, typename _Size, typename _ForwardIter>
74 pair<_InputIter, _ForwardIter>
75 __uninitialized_copy_n(_InputIter __first, _Size __count,
76 _ForwardIter __result, std::input_iterator_tag)
77 {
78 _ForwardIter __cur = __result;
79 __try
80 {
81 for (; __count > 0 ; --__count, ++__first, ++__cur)
82 std::_Construct(&*__cur, *__first);
83 return pair<_InputIter, _ForwardIter>(__first, __cur);
84 }
85 __catch(...)
86 {
87 std::_Destroy(__result, __cur);
88 __throw_exception_again;
89 }
90 }
91
92 template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
93 inline pair<_RandomAccessIter, _ForwardIter>
94 __uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
95 _ForwardIter __result,
96 std::random_access_iterator_tag)
97 {
98 _RandomAccessIter __last = __first + __count;
99 return (pair<_RandomAccessIter, _ForwardIter>
100 (__last, std::uninitialized_copy(__first, __last, __result)));
101 }
102
103 template<typename _InputIter, typename _Size, typename _ForwardIter>
104 inline pair<_InputIter, _ForwardIter>
105 __uninitialized_copy_n(_InputIter __first, _Size __count,
106 _ForwardIter __result)
107 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
108 __iterator_category(__first)); }
109
110 /**
111 * @brief Copies the range [first,last) into result.
112 * @param __first An input iterator.
113 * @param __count Length
114 * @param __result An output iterator.
115 * @return __result + (__first + __count)
116 * @ingroup SGIextensions
117 *
118 * Like copy(), but does not require an initialized output range.
119 */
120 template<typename _InputIter, typename _Size, typename _ForwardIter>
121 inline pair<_InputIter, _ForwardIter>
122 uninitialized_copy_n(_InputIter __first, _Size __count,
123 _ForwardIter __result)
124 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
125 __iterator_category(__first)); }
126
127
128 // An alternative version of uninitialized_copy_n that constructs
129 // and destroys objects with a user-provided allocator.
130 template<typename _InputIter, typename _Size, typename _ForwardIter,
131 typename _Allocator>
132 pair<_InputIter, _ForwardIter>
133 __uninitialized_copy_n_a(_InputIter __first, _Size __count,
134 _ForwardIter __result,
135 _Allocator __alloc)
136 {
137 _ForwardIter __cur = __result;
138 __try
139 {
140 for (; __count > 0 ; --__count, ++__first, ++__cur)
141 __alloc.construct(&*__cur, *__first);
142 return pair<_InputIter, _ForwardIter>(__first, __cur);
143 }
144 __catch(...)
145 {
146 std::_Destroy(__result, __cur, __alloc);
147 __throw_exception_again;
148 }
149 }
150
151 template<typename _InputIter, typename _Size, typename _ForwardIter,
152 typename _Tp>
153 inline pair<_InputIter, _ForwardIter>
154 __uninitialized_copy_n_a(_InputIter __first, _Size __count,
155 _ForwardIter __result,
156 std::allocator<_Tp>)
157 {
158 return __gnu_cxx::uninitialized_copy_n(__first, __count, __result);
159 }
160
161 /**
162 * This class provides similar behavior and semantics of the standard
163 * functions get_temporary_buffer() and return_temporary_buffer(), but
164 * encapsulated in a type vaguely resembling a standard container.
165 *
166 * By default, a temporary_buffer<Iter> stores space for objects of
167 * whatever type the Iter iterator points to. It is constructed from a
168 * typical [first,last) range, and provides the begin(), end(), size()
169 * functions, as well as requested_size(). For non-trivial types, copies
170 * of *first will be used to initialize the storage.
171 *
172 * @c malloc is used to obtain underlying storage.
173 *
174 * Like get_temporary_buffer(), not all the requested memory may be
175 * available. Ideally, the created buffer will be large enough to hold a
176 * copy of [first,last), but if size() is less than requested_size(),
177 * then this didn't happen.
178 *
179 * @ingroup SGIextensions
180 */
181 template <class _ForwardIterator, class _Tp
182 = typename std::iterator_traits<_ForwardIterator>::value_type >
183 struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
184 {
185 /// Requests storage large enough to hold a copy of [first,last).
186 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
187 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { }
188
189 /// Destroys objects and frees storage.
190 ~temporary_buffer() { }
191 };
192
193 _GLIBCXX_END_NAMESPACE_VERSION
194 } // namespace
195
196 #endif
197