libstdc++-v3/include/bits/stl_construct.h

   1 // nonstandard construct and destroy functions -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
   4 // 2009, 2010
   5 // Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // Under Section 7 of GPL version 3, you are granted additional
  19 // permissions described in the GCC Runtime Library Exception, version
  20 // 3.1, as published by the Free Software Foundation.
  21
  22 // You should have received a copy of the GNU General Public License and
  23 // a copy of the GCC Runtime Library Exception along with this program;
  24 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 // <http://www.gnu.org/licenses/>.
  26
  27 /*
  28  *
  29  * Copyright (c) 1994
  30  * Hewlett-Packard Company
  31  *
  32  * Permission to use, copy, modify, distribute and sell this software
  33  * and its documentation for any purpose is hereby granted without fee,
  34  * provided that the above copyright notice appear in all copies and
  35  * that both that copyright notice and this permission notice appear
  36  * in supporting documentation.  Hewlett-Packard Company makes no
  37  * representations about the suitability of this software for any
  38  * purpose.  It is provided "as is" without express or implied warranty.
  39  *
  40  *
  41  * Copyright (c) 1996,1997
  42  * Silicon Graphics Computer Systems, Inc.
  43  *
  44  * Permission to use, copy, modify, distribute and sell this software
  45  * and its documentation for any purpose is hereby granted without fee,
  46  * provided that the above copyright notice appear in all copies and
  47  * that both that copyright notice and this permission notice appear
  48  * in supporting documentation.  Silicon Graphics makes no
  49  * representations about the suitability of this software for any
  50  * purpose.  It is provided "as is" without express or implied warranty.
  51  */
  52
  53 /** @file bits/stl_construct.h
  54  *  This is an internal header file, included by other library headers.
  55  *  Do not attempt to use it directly. @headername{memory}
  56  */
  57
  58 #ifndef _STL_CONSTRUCT_H
  59 #define _STL_CONSTRUCT_H 1
  60
  61 #include <new>
  62 #include <bits/move.h>
  63 #include <ext/alloc_traits.h>
  64
  65 namespace std _GLIBCXX_VISIBILITY(default)
  66 {
  67 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  68
  69   /**
  70    * Constructs an object in existing memory by invoking an allocated
  71    * object's constructor with an initializer.
  72    */
  73 #ifdef __GXX_EXPERIMENTAL_CXX0X__
  74   template<typename _T1, typename... _Args>
  75     inline void
  76     _Construct(_T1* __p, _Args&&... __args)
  77     { ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
  78 #else
  79   template<typename _T1, typename _T2>
  80     inline void
  81     _Construct(_T1* __p, const _T2& __value)
  82     {
  83       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  84       // 402. wrong new expression in [some_]allocator::construct
  85       ::new(static_cast<void*>(__p)) _T1(__value);
  86     }
  87 #endif
  88
  89   /**
  90    * Destroy the object pointed to by a pointer type.
  91    */
  92   template<typename _Tp>
  93     inline void
  94     _Destroy(_Tp* __pointer)
  95     { __pointer->~_Tp(); }
  96
  97   template<bool>
  98     struct _Destroy_aux
  99     {
 100       template<typename _ForwardIterator>
 101         static void
 102         __destroy(_ForwardIterator __first, _ForwardIterator __last)
 103         {
 104           for (; __first != __last; ++__first)
 105             std::_Destroy(std::__addressof(*__first));
 106         }
 107     };
 108
 109   template<>
 110     struct _Destroy_aux<true>
 111     {
 112       template<typename _ForwardIterator>
 113         static void
 114         __destroy(_ForwardIterator, _ForwardIterator) { }
 115     };
 116
 117   /**
 118    * Destroy a range of objects.  If the value_type of the object has
 119    * a trivial destructor, the compiler should optimize all of this
 120    * away, otherwise the objects' destructors must be invoked.
 121    */
 122   template<typename _ForwardIterator>
 123     inline void
 124     _Destroy(_ForwardIterator __first, _ForwardIterator __last)
 125     {
 126       typedef typename iterator_traits<_ForwardIterator>::value_type
 127                        _Value_type;
 128       std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
 129         __destroy(__first, __last);
 130     }
 131
 132   /**
 133    * Destroy a range of objects using the supplied allocator.  For
 134    * nondefault allocators we do not optimize away invocation of
 135    * destroy() even if _Tp has a trivial destructor.
 136    */
 137
 138   template <typename _Tp> class allocator;
 139
 140   template<typename _ForwardIterator, typename _Allocator>
 141     void
 142     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
 143              _Allocator& __alloc)
 144     {
 145       typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
 146       for (; __first != __last; ++__first)
 147         __traits::destroy(__alloc, std::__addressof(*__first));
 148     }
 149
 150   template<typename _ForwardIterator, typename _Tp>
 151     inline void
 152     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
 153              allocator<_Tp>&)
 154     {
 155       _Destroy(__first, __last);
 156     }
 157
 158 _GLIBCXX_END_NAMESPACE_VERSION
 159 } // namespace
 160
 161 #endif /* _STL_CONSTRUCT_H */
 162