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1 : // nonstandard construct and destroy functions -*- C++ -*-
2 :
3 : // Copyright (C) 2001-2014 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 71 : _Construct(_T1* __p, _Args&&... __args)
75 71 : { ::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
92 138 : _Destroy(_Tp* __pointer)
93 138 : { __pointer->~_Tp(); }
94 :
95 : template<bool>
96 : struct _Destroy_aux
97 : {
98 : template<typename _ForwardIterator>
99 : static void
100 240 : __destroy(_ForwardIterator __first, _ForwardIterator __last)
101 : {
102 378 : for (; __first != __last; ++__first)
103 138 : std::_Destroy(std::__addressof(*__first));
104 240 : }
105 : };
106 :
107 : template<>
108 : struct _Destroy_aux<true>
109 : {
110 : template<typename _ForwardIterator>
111 : static void
112 84 : __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
122 324 : _Destroy(_ForwardIterator __first, _ForwardIterator __last)
123 : {
124 : typedef typename iterator_traits<_ForwardIterator>::value_type
125 : _Value_type;
126 324 : std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
127 : __destroy(__first, __last);
128 324 : }
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 _ForwardIterator, typename _Allocator>
137 : void
138 : _Destroy(_ForwardIterator __first, _ForwardIterator __last,
139 : _Allocator& __alloc)
140 : {
141 : typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
142 : for (; __first != __last; ++__first)
143 : __traits::destroy(__alloc, std::__addressof(*__first));
144 : }
145 :
146 : template<typename _ForwardIterator, typename _Tp>
147 : inline void
148 324 : _Destroy(_ForwardIterator __first, _ForwardIterator __last,
149 : allocator<_Tp>&)
150 : {
151 324 : _Destroy(__first, __last);
152 324 : }
153 :
154 : _GLIBCXX_END_NAMESPACE_VERSION
155 : } // namespace std
156 :
157 : #endif /* _STL_CONSTRUCT_H */
158 :
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