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 
00062 _GLIBCXX_BEGIN_NAMESPACE(std)
00063 
00064   /**
00065    * Constructs an object in existing memory by invoking an allocated
00066    * object's constructor with an initializer.
00067    */
00068   template<typename _T1, typename _T2>
00069     inline void
00070     _Construct(_T1* __p, const _T2& __value)
00071     {
00072       // _GLIBCXX_RESOLVE_LIB_DEFECTS
00073       // 402. wrong new expression in [some_]allocator::construct
00074       ::new(static_cast<void*>(__p)) _T1(__value);
00075     }
00076 
00077   /**
00078    * Destroy the object pointed to by a pointer type.
00079    */
00080   template<typename _Tp>
00081     inline void
00082     _Destroy(_Tp* __pointer)
00083     { __pointer->~_Tp(); }
00084 
00085   template<bool>
00086     struct _Destroy_aux
00087     {
00088       template<typename _ForwardIterator>
00089         static void
00090         __destroy(_ForwardIterator __first, _ForwardIterator __last)
00091     {
00092       for (; __first != __last; ++__first)
00093         std::_Destroy(&*__first);
00094     }
00095     };
00096 
00097   template<>
00098     struct _Destroy_aux<true>
00099     {
00100       template<typename _ForwardIterator>
00101         static void
00102         __destroy(_ForwardIterator, _ForwardIterator) { }
00103     };
00104 
00105   /**
00106    * Destroy a range of objects.  If the value_type of the object has
00107    * a trivial destructor, the compiler should optimize all of this
00108    * away, otherwise the objects' destructors must be invoked.
00109    */
00110   template<typename _ForwardIterator>
00111     inline void
00112     _Destroy(_ForwardIterator __first, _ForwardIterator __last)
00113     {
00114       typedef typename iterator_traits<_ForwardIterator>::value_type
00115                        _Value_type;
00116       std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
00117     __destroy(__first, __last);
00118     }
00119 
00120   /**
00121    * Destroy a range of objects using the supplied allocator.  For
00122    * nondefault allocators we do not optimize away invocation of 
00123    * destroy() even if _Tp has a trivial destructor.
00124    */
00125 
00126   template <typename _Tp> class allocator;
00127 
00128   template<typename _ForwardIterator, typename _Allocator>
00129     void
00130     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
00131          _Allocator& __alloc)
00132     {
00133       for (; __first != __last; ++__first)
00134     __alloc.destroy(&*__first);
00135     }
00136 
00137   template<typename _ForwardIterator, typename _Tp>
00138     inline void
00139     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
00140          allocator<_Tp>&)
00141     {
00142       _Destroy(__first, __last);
00143     }
00144 
00145 _GLIBCXX_END_NAMESPACE
00146 
00147 #endif /* _STL_CONSTRUCT_H */
00148 

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