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