stl_construct.h

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00001 // nonstandard construct and destroy functions -*- C++ -*-
00002 
00003 // Copyright (C) 2001, 2002 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  *
00032  * Copyright (c) 1994
00033  * Hewlett-Packard Company
00034  *
00035  * Permission to use, copy, modify, distribute and sell this software
00036  * and its documentation for any purpose is hereby granted without fee,
00037  * provided that the above copyright notice appear in all copies and
00038  * that both that copyright notice and this permission notice appear
00039  * in supporting documentation.  Hewlett-Packard Company makes no
00040  * representations about the suitability of this software for any
00041  * purpose.  It is provided "as is" without express or implied warranty.
00042  *
00043  *
00044  * Copyright (c) 1996,1997
00045  * Silicon Graphics Computer Systems, Inc.
00046  *
00047  * Permission to use, copy, modify, distribute and sell this software
00048  * and its documentation for any purpose is hereby granted without fee,
00049  * provided that the above copyright notice appear in all copies and
00050  * that both that copyright notice and this permission notice appear
00051  * in supporting documentation.  Silicon Graphics makes no
00052  * representations about the suitability of this software for any
00053  * purpose.  It is provided "as is" without express or implied warranty.
00054  */
00055 
00056 /** @file stl_construct.h
00057  *  This is an internal header file, included by other library headers.
00058  *  You should not attempt to use it directly.
00059  */
00060 
00061 #ifndef _CPP_BITS_STL_CONSTRUCT_H
00062 #define _CPP_BITS_STL_CONSTRUCT_H 1
00063 
00064 #include <bits/type_traits.h>
00065 #include <new>
00066 
00067 namespace std
00068 {
00069   /**
00070    * @if maint
00071    * Constructs an object in existing memory by invoking an allocated
00072    * object's constructor with an initializer.
00073    * @endif
00074    */
00075   template <class _T1, class _T2>
00076     inline void
00077     _Construct(_T1* __p, const _T2& __value)
00078     { new (static_cast<void*>(__p)) _T1(__value); }
00079   
00080   /**
00081    * @if maint
00082    * Constructs an object in existing memory by invoking an allocated
00083    * object's default constructor (no initializers).
00084    * @endif
00085    */
00086   template <class _T1>
00087     inline void
00088     _Construct(_T1* __p)
00089     { new (static_cast<void*>(__p)) _T1(); }
00090 
00091   /**
00092    * @if maint
00093    * Destroy a range of objects with nontrivial destructors.  
00094    *
00095    * This is a helper function used only by _Destroy().
00096    * @endif
00097    */
00098   template <class _ForwardIterator>
00099     inline void
00100     __destroy_aux(_ForwardIterator __first, _ForwardIterator __last, __false_type)
00101     { for ( ; __first != __last; ++__first) _Destroy(&*__first); }
00102 
00103   /**
00104    * @if maint
00105    * Destroy a range of objects with trivial destructors.  Since the destructors
00106    * are trivial, there's nothing to do and hopefully this function will be
00107    * entirely optimized away.
00108    *
00109    * This is a helper function used only by _Destroy().
00110    * @endif
00111    */
00112   template <class _ForwardIterator> 
00113     inline void
00114     __destroy_aux(_ForwardIterator, _ForwardIterator, __true_type)
00115     { }
00116 
00117   /**
00118    * @if maint
00119    * Destroy the object pointed to by a pointer type.
00120    * @endif
00121    */
00122   template <class _Tp>
00123     inline void
00124     _Destroy(_Tp* __pointer)
00125     { __pointer->~_Tp(); }
00126   
00127   /**
00128    * @if maint
00129    * Destroy a range of objects.  If the value_type of the object has
00130    * a trivial destructor, the compiler should optimize all of this
00131    * away, otherwise the objects' destructors must be invoked.
00132    * @endif
00133    */
00134   template <class _ForwardIterator>
00135     inline void
00136     _Destroy(_ForwardIterator __first, _ForwardIterator __last)
00137     {
00138       typedef typename iterator_traits<_ForwardIterator>::value_type
00139                        _Value_type;
00140       typedef typename __type_traits<_Value_type>::has_trivial_destructor
00141                        _Has_trivial_destructor;
00142 
00143       __destroy_aux(__first, __last, _Has_trivial_destructor());
00144     }
00145 } // namespace std
00146 
00147 #endif /* _CPP_BITS_STL_CONSTRUCT_H */
00148 

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