# stl_construct.h

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    00001 // nonstandard construct and destroy functions -*- C++ -*-
    00002
    00003 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
    00004 // Free Software Foundation, Inc.
    00005 //
    00006 // This file is part of the GNU ISO C++ Library.  This library is free
    00007 // software; you can redistribute it and/or modify it under the
    00008 // terms of the GNU General Public License as published by the
    00009 // Free Software Foundation; either version 3, or (at your option)
    00010 // any later version.
    00011
    00012 // This library is distributed in the hope that it will be useful,
    00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015 // GNU General Public License for more details.
    00016
    00017 // Under Section 7 of GPL version 3, you are granted additional
    00018 // permissions described in the GCC Runtime Library Exception, version
    00019 // 3.1, as published by the Free Software Foundation.
    00020
    00021 // You should have received a copy of the GNU General Public License and
    00022 // a copy of the GCC Runtime Library Exception along with this program;
    00023 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    00024 // <http://www.gnu.org/licenses/>.
    00025
    00026 /*
    00027  *
    00028  * Copyright (c) 1994
    00029  * Hewlett-Packard Company
    00030  *
    00031  * Permission to use, copy, modify, distribute and sell this software
    00032  * and its documentation for any purpose is hereby granted without fee,
    00033  * provided that the above copyright notice appear in all copies and
    00034  * that both that copyright notice and this permission notice appear
    00035  * in supporting documentation.  Hewlett-Packard Company makes no
    00036  * representations about the suitability of this software for any
    00037  * purpose.  It is provided "as is" without express or implied warranty.
    00038  *
    00039  *
    00040  * Copyright (c) 1996,1997
    00041  * Silicon Graphics Computer Systems, Inc.
    00042  *
    00043  * Permission to use, copy, modify, distribute and sell this software
    00044  * and its documentation for any purpose is hereby granted without fee,
    00045  * provided that the above copyright notice appear in all copies and
    00046  * that both that copyright notice and this permission notice appear
    00047  * in supporting documentation.  Silicon Graphics makes no
    00048  * representations about the suitability of this software for any
    00049  * purpose.  It is provided "as is" without express or implied warranty.
    00050  */
    00051
    00052 /** @file stl_construct.h
    00053  *  This is an internal header file, included by other library headers.
    00054  *  You should not attempt to use it directly.
    00055  */
    00056
    00057 #ifndef _STL_CONSTRUCT_H
    00058 #define _STL_CONSTRUCT_H 1
    00059
    00060 #include <new>
    00061 #include <bits/move.h>
    00062
    00063 _GLIBCXX_BEGIN_NAMESPACE(std)
    00064
    00065   /**
    00066    * Constructs an object in existing memory by invoking an allocated
    00067    * object's constructor with an initializer.
    00068    */
    00069   template<typename _T1, typename _T2>
    00070     inline void
    00071 #ifdef __GXX_EXPERIMENTAL_CXX0X__
    00072     // Allow perfect forwarding
    00073     _Construct(_T1* __p, _T2&& __value)
    00074 #else
    00075     _Construct(_T1* __p, const _T2& __value)
    00076 #endif
    00077     {
    00078       // _GLIBCXX_RESOLVE_LIB_DEFECTS
    00079       // 402. wrong new expression in [some_]allocator::construct
    00080       ::new(static_cast<void*>(__p)) _T1(_GLIBCXX_FORWARD(_T2, __value));
    00081     }
    00082
    00083   /**
    00084    * Destroy the object pointed to by a pointer type.
    00085    */
    00086   template<typename _Tp>
    00087     inline void
    00088     _Destroy(_Tp* __pointer)
    00089     { __pointer->~_Tp(); }
    00090
    00091   template<bool>
    00092     struct _Destroy_aux
    00093     {
    00094       template<typename _ForwardIterator>
    00095         static void
    00096         __destroy(_ForwardIterator __first, _ForwardIterator __last)
    00097     {
    00098       for (; __first != __last; ++__first)
    00099         std::_Destroy(&*__first);
    00100     }
    00101     };
    00102
    00103   template<>
    00104     struct _Destroy_aux<true>
    00105     {
    00106       template<typename _ForwardIterator>
    00107         static void
    00108         __destroy(_ForwardIterator, _ForwardIterator) { }
    00109     };
    00110
    00111   /**
    00112    * Destroy a range of objects.  If the value_type of the object has
    00113    * a trivial destructor, the compiler should optimize all of this
    00114    * away, otherwise the objects' destructors must be invoked.
    00115    */
    00116   template<typename _ForwardIterator>
    00117     inline void
    00118     _Destroy(_ForwardIterator __first, _ForwardIterator __last)
    00119     {
    00120       typedef typename iterator_traits<_ForwardIterator>::value_type
    00121                        _Value_type;
    00122       std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
    00123     __destroy(__first, __last);
    00124     }
    00125
    00126   /**
    00127    * Destroy a range of objects using the supplied allocator.  For
    00128    * nondefault allocators we do not optimize away invocation of
    00129    * destroy() even if _Tp has a trivial destructor.
    00130    */
    00131
    00132   template <typename _Tp> class allocator;
    00133
    00134   template<typename _ForwardIterator, typename _Allocator>
    00135     void
    00136     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
    00137          _Allocator& __alloc)
    00138     {
    00139       for (; __first != __last; ++__first)
    00140     __alloc.destroy(&*__first);
    00141     }
    00142
    00143   template<typename _ForwardIterator, typename _Tp>
    00144     inline void
    00145     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
    00146          allocator<_Tp>&)
    00147     {
    00148       _Destroy(__first, __last);
    00149     }
    00150
    00151 _GLIBCXX_END_NAMESPACE
    00152
    00153 #endif /* _STL_CONSTRUCT_H */
    00154