libstdc++

stl_construct.h
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1 // nonstandard construct and destroy functions -*- 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 /*
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) 1996,1997
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 bits/stl_construct.h
52 * This is an internal header file, included by other library headers.
53 * Do not attempt to use it directly. @headername{memory}
54 */
55
56 #ifndef _STL_CONSTRUCT_H
57 #define _STL_CONSTRUCT_H 1
58
59 #include <new>
60 #include <bits/move.h>
61 #include <ext/alloc_traits.h>
62
63 namespace std _GLIBCXX_VISIBILITY(default)
64 {
65 _GLIBCXX_BEGIN_NAMESPACE_VERSION
66
67 /**
68 * Constructs an object in existing memory by invoking an allocated
69 * object's constructor with an initializer.
70 */
71 #if __cplusplus >= 201103L
72 template<typename _T1, typename... _Args>
73 inline void
74 _Construct(_T1* __p, _Args&&... __args)
75 { ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
76 #else
77 template<typename _T1, typename _T2>
78 inline void
79 _Construct(_T1* __p, const _T2& __value)
80 {
81 // _GLIBCXX_RESOLVE_LIB_DEFECTS
82 // 402. wrong new expression in [some_]allocator::construct
83 ::new(static_cast<void*>(__p)) _T1(__value);
84 }
85 #endif
86
87 /**
88 * Destroy the object pointed to by a pointer type.
89 */
90 template<typename _Tp>
91 inline void
92 _Destroy(_Tp* __pointer)
93 { __pointer->~_Tp(); }
94
95 template<bool>
96 struct _Destroy_aux
97 {
98 template<typename _ForwardIterator>
99 static void
100 __destroy(_ForwardIterator __first, _ForwardIterator __last)
101 {
102 for (; __first != __last; ++__first)
103 std::_Destroy(std::__addressof(*__first));
104 }
105 };
106
107 template<>
108 struct _Destroy_aux<true>
109 {
110 template<typename _ForwardIterator>
111 static void
112 __destroy(_ForwardIterator, _ForwardIterator) { }
113 };
114
115 /**
116 * Destroy a range of objects. If the value_type of the object has
117 * a trivial destructor, the compiler should optimize all of this
118 * away, otherwise the objects' destructors must be invoked.
119 */
120 template<typename _ForwardIterator>
121 inline void
122 _Destroy(_ForwardIterator __first, _ForwardIterator __last)
123 {
124 typedef typename iterator_traits<_ForwardIterator>::value_type
125 _Value_type;
126 std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
127 __destroy(__first, __last);
128 }
129
130 /**
131 * Destroy a range of objects using the supplied allocator. For
132 * nondefault allocators we do not optimize away invocation of
133 * destroy() even if _Tp has a trivial destructor.
134 */
135
136 template <typename _Tp> class allocator;
137
138 template<typename _ForwardIterator, typename _Allocator>
139 void
140 _Destroy(_ForwardIterator __first, _ForwardIterator __last,
141 _Allocator& __alloc)
142 {
143 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
144 for (; __first != __last; ++__first)
145 __traits::destroy(__alloc, std::__addressof(*__first));
146 }
147
148 template<typename _ForwardIterator, typename _Tp>
149 inline void
150 _Destroy(_ForwardIterator __first, _ForwardIterator __last,
151 allocator<_Tp>&)
152 {
153 _Destroy(__first, __last);
154 }
155
156 _GLIBCXX_END_NAMESPACE_VERSION
157 } // namespace
158
159 #endif /* _STL_CONSTRUCT_H */
160