1 // nonstandard construct and destroy functions -*- C++ -*-
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39 * Copyright (c) 1996,1997
40 * Silicon Graphics Computer Systems, Inc.
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43 * and its documentation for any purpose is hereby granted without fee,
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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}
56 #ifndef _STL_CONSTRUCT_H
57 #define _STL_CONSTRUCT_H 1
60 #include <bits/move.h>
61 #include <ext/alloc_traits.h>
63 namespace std
_GLIBCXX_VISIBILITY(default)
65 _GLIBCXX_BEGIN_NAMESPACE_VERSION
68 * Constructs an object in existing memory by invoking an allocated
69 * object's constructor with an initializer.
71 #if __cplusplus >= 201103L
72 template<typename _T1
, typename
... _Args
>
74 _Construct(_T1
* __p
, _Args
&&... __args
)
75 { ::new(static_cast<void*>(__p
)) _T1(std::forward
<_Args
>(__args
)...); }
77 template<typename _T1
, typename _T2
>
79 _Construct(_T1
* __p
, const _T2
& __value
)
81 // _GLIBCXX_RESOLVE_LIB_DEFECTS
82 // 402. wrong new expression in [some_]allocator::construct
83 ::new(static_cast<void*>(__p
)) _T1(__value
);
88 * Destroy the object pointed to by a pointer type.
90 template<typename _Tp
>
92 _Destroy(_Tp
* __pointer
)
93 { __pointer
->~_Tp(); }
98 template<typename _ForwardIterator
>
100 __destroy(_ForwardIterator __first
, _ForwardIterator __last
)
102 for (; __first
!= __last
; ++__first
)
103 std::_Destroy(std::__addressof(*__first
));
108 struct _Destroy_aux
<true>
110 template<typename _ForwardIterator
>
112 __destroy(_ForwardIterator
, _ForwardIterator
) { }
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.
120 template<typename _ForwardIterator
>
122 _Destroy(_ForwardIterator __first
, _ForwardIterator __last
)
124 typedef typename iterator_traits
<_ForwardIterator
>::value_type
126 std::_Destroy_aux
<__has_trivial_destructor(_Value_type
)>::
127 __destroy(__first
, __last
);
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.
136 template<typename _ForwardIterator
, typename _Allocator
>
138 _Destroy(_ForwardIterator __first
, _ForwardIterator __last
,
141 typedef __gnu_cxx::__alloc_traits
<_Allocator
> __traits
;
142 for (; __first
!= __last
; ++__first
)
143 __traits::destroy(__alloc
, std::__addressof(*__first
));
146 template<typename _ForwardIterator
, typename _Tp
>
148 _Destroy(_ForwardIterator __first
, _ForwardIterator __last
,
151 _Destroy(__first
, __last
);
154 _GLIBCXX_END_NAMESPACE_VERSION
157 #endif /* _STL_CONSTRUCT_H */