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1 : // nonstandard construct and destroy functions -*- C++ -*-
2 :
3 : // Copyright (C) 2001-2019 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 117730652 : _Construct(_T1* __p, _Args&&... __args)
75 59139531 : { ::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 : template<typename _T1>
88 : inline void
89 : _Construct_novalue(_T1* __p)
90 : { ::new(static_cast<void*>(__p)) _T1; }
91 :
92 : /**
93 : * Destroy the object pointed to by a pointer type.
94 : */
95 : template<typename _Tp>
96 : inline void
97 668768863 : _Destroy(_Tp* __pointer)
98 668836015 : { __pointer->~_Tp(); }
99 :
100 : template<bool>
101 : struct _Destroy_aux
102 : {
103 : template<typename _ForwardIterator>
104 : static void
105 0 : __destroy(_ForwardIterator __first, _ForwardIterator __last)
106 : {
107 761265860 : for (; __first != __last; ++__first)
108 838144114 : std::_Destroy(std::__addressof(*__first));
109 0 : }
110 : };
111 :
112 : template<>
113 : struct _Destroy_aux<true>
114 : {
115 : template<typename _ForwardIterator>
116 : static void
117 666840916 : __destroy(_ForwardIterator, _ForwardIterator) { }
118 : };
119 :
120 : /**
121 : * Destroy a range of objects. If the value_type of the object has
122 : * a trivial destructor, the compiler should optimize all of this
123 : * away, otherwise the objects' destructors must be invoked.
124 : */
125 : template<typename _ForwardIterator>
126 : inline void
127 471300243 : _Destroy(_ForwardIterator __first, _ForwardIterator __last)
128 : {
129 : typedef typename iterator_traits<_ForwardIterator>::value_type
130 : _Value_type;
131 : #if __cplusplus >= 201103L
132 : // A deleted destructor is trivial, this ensures we reject such types:
133 : static_assert(is_destructible<_Value_type>::value,
134 : "value type is destructible");
135 : #endif
136 : std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
137 512873318 : __destroy(__first, __last);
138 0 : }
139 :
140 : template<bool>
141 : struct _Destroy_n_aux
142 : {
143 : template<typename _ForwardIterator, typename _Size>
144 : static _ForwardIterator
145 : __destroy_n(_ForwardIterator __first, _Size __count)
146 : {
147 : for (; __count > 0; (void)++__first, --__count)
148 : std::_Destroy(std::__addressof(*__first));
149 : return __first;
150 : }
151 : };
152 :
153 : template<>
154 : struct _Destroy_n_aux<true>
155 : {
156 : template<typename _ForwardIterator, typename _Size>
157 : static _ForwardIterator
158 : __destroy_n(_ForwardIterator __first, _Size __count)
159 : {
160 : std::advance(__first, __count);
161 : return __first;
162 : }
163 : };
164 :
165 : /**
166 : * Destroy a range of objects. If the value_type of the object has
167 : * a trivial destructor, the compiler should optimize all of this
168 : * away, otherwise the objects' destructors must be invoked.
169 : */
170 : template<typename _ForwardIterator, typename _Size>
171 : inline _ForwardIterator
172 : _Destroy_n(_ForwardIterator __first, _Size __count)
173 : {
174 : typedef typename iterator_traits<_ForwardIterator>::value_type
175 : _Value_type;
176 : #if __cplusplus >= 201103L
177 : // A deleted destructor is trivial, this ensures we reject such types:
178 : static_assert(is_destructible<_Value_type>::value,
179 : "value type is destructible");
180 : #endif
181 : return std::_Destroy_n_aux<__has_trivial_destructor(_Value_type)>::
182 : __destroy_n(__first, __count);
183 : }
184 :
185 : /**
186 : * Destroy a range of objects using the supplied allocator. For
187 : * nondefault allocators we do not optimize away invocation of
188 : * destroy() even if _Tp has a trivial destructor.
189 : */
190 :
191 : template<typename _ForwardIterator, typename _Allocator>
192 : void
193 : _Destroy(_ForwardIterator __first, _ForwardIterator __last,
194 : _Allocator& __alloc)
195 : {
196 : typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
197 : for (; __first != __last; ++__first)
198 : __traits::destroy(__alloc, std::__addressof(*__first));
199 : }
200 :
201 : template<typename _ForwardIterator, typename _Tp>
202 : inline void
203 137246935 : _Destroy(_ForwardIterator __first, _ForwardIterator __last,
204 : allocator<_Tp>&)
205 : {
206 704751718 : _Destroy(__first, __last);
207 0 : }
208 :
209 : #if __cplusplus > 201402L
210 : template <typename _Tp>
211 : inline void
212 : destroy_at(_Tp* __location)
213 : {
214 : std::_Destroy(__location);
215 : }
216 :
217 : template <typename _ForwardIterator>
218 : inline void
219 : destroy(_ForwardIterator __first, _ForwardIterator __last)
220 : {
221 : std::_Destroy(__first, __last);
222 : }
223 :
224 : template <typename _ForwardIterator, typename _Size>
225 : inline _ForwardIterator
226 : destroy_n(_ForwardIterator __first, _Size __count)
227 : {
228 : return std::_Destroy_n(__first, __count);
229 : }
230 : #endif
231 :
232 : _GLIBCXX_END_NAMESPACE_VERSION
233 : } // namespace std
234 :
235 : #endif /* _STL_CONSTRUCT_H */
236 :
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