libstdc++
ext/memory
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1 // Memory extensions -*- C++ -*-
2 
3 // Copyright (C) 2002-2017 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;
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,
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>
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>
154  __uninitialized_copy_n_a(_InputIter __first, _Size __count,
155  _ForwardIter __result,
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.
191  };
192 
193 _GLIBCXX_END_NAMESPACE_VERSION
194 } // namespace
195 
196 #endif
197 
The standard allocator, as per [20.4].
Definition: allocator.h:108
constexpr iterator_traits< _Iter >::iterator_category __iterator_category(const _Iter &)
~temporary_buffer()
Destroys objects and frees storage.
Definition: ext/memory:190
void _Destroy(_Tp *__pointer)
Definition: stl_construct.h:97
GNU extensions for public use.
pair< _InputIter, _ForwardIter > uninitialized_copy_n(_InputIter __first, _Size __count, _ForwardIter __result)
Copies the range [first,last) into result.
Definition: ext/memory:122
Marking input iterators.
_ForwardIterator uninitialized_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __result)
Copies the range [first,last) into result.
void _Construct(_T1 *__p, _Args &&... __args)
Definition: stl_construct.h:74
Random-access iterators support a superset of bidirectional iterator operations.
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:198
temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
Requests storage large enough to hold a copy of [first,last).
Definition: ext/memory:186