stl_construct.h

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00001 // nonstandard construct and destroy functions -*- C++ -*-
00002 
00003 // Copyright (C) 2001, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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 _STL_CONSTRUCT_H
00062 #define _STL_CONSTRUCT_H 1
00063 
00064 #include <bits/cpp_type_traits.h>
00065 #include <new>
00066 
00067 _GLIBCXX_BEGIN_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<typename _T1, typename _T2>
00076     inline void
00077     _Construct(_T1* __p, const _T2& __value)
00078     {
00079       // _GLIBCXX_RESOLVE_LIB_DEFECTS
00080       // 402. wrong new expression in [some_]allocator::construct
00081       ::new(static_cast<void*>(__p)) _T1(__value);
00082     }
00083 
00084   /**
00085    * @if maint
00086    * Constructs an object in existing memory by invoking an allocated
00087    * object's default constructor (no initializers).
00088    * @endif
00089    */
00090   template<typename _T1>
00091     inline void
00092     _Construct(_T1* __p)
00093     {
00094       // _GLIBCXX_RESOLVE_LIB_DEFECTS
00095       // 402. wrong new expression in [some_]allocator::construct
00096       ::new(static_cast<void*>(__p)) _T1();
00097     }
00098 
00099   /**
00100    * @if maint
00101    * Destroy the object pointed to by a pointer type.
00102    * @endif
00103    */
00104   template<typename _Tp>
00105     inline void
00106     _Destroy(_Tp* __pointer)
00107     { __pointer->~_Tp(); }
00108 
00109   /**
00110    * @if maint
00111    * Destroy a range of objects with nontrivial destructors.
00112    *
00113    * This is a helper function used only by _Destroy().
00114    * @endif
00115    */
00116   template<typename _ForwardIterator>
00117     inline void
00118     __destroy_aux(_ForwardIterator __first, _ForwardIterator __last,
00119           __false_type)
00120     {
00121       for (; __first != __last; ++__first)
00122     std::_Destroy(&*__first);
00123     }
00124 
00125   /**
00126    * @if maint
00127    * Destroy a range of objects with trivial destructors.  Since the destructors
00128    * are trivial, there's nothing to do and hopefully this function will be
00129    * entirely optimized away.
00130    *
00131    * This is a helper function used only by _Destroy().
00132    * @endif
00133    */
00134   template<typename _ForwardIterator>
00135     inline void
00136     __destroy_aux(_ForwardIterator, _ForwardIterator, __true_type)
00137     { }
00138 
00139   /**
00140    * @if maint
00141    * Destroy a range of objects.  If the value_type of the object has
00142    * a trivial destructor, the compiler should optimize all of this
00143    * away, otherwise the objects' destructors must be invoked.
00144    * @endif
00145    */
00146   template<typename _ForwardIterator>
00147     inline void
00148     _Destroy(_ForwardIterator __first, _ForwardIterator __last)
00149     {
00150       typedef typename iterator_traits<_ForwardIterator>::value_type
00151                        _Value_type;
00152       typedef typename std::__is_scalar<_Value_type>::__type
00153                    _Has_trivial_destructor;
00154 
00155       std::__destroy_aux(__first, __last, _Has_trivial_destructor());
00156     }
00157 
00158   /**
00159    * @if maint
00160    * Destroy a range of objects using the supplied allocator.  For
00161    * nondefault allocators we do not optimize away invocation of 
00162    * destroy() even if _Tp has a trivial destructor.
00163    * @endif
00164    */
00165 
00166   template <typename _Tp> class allocator;
00167 
00168   template<typename _ForwardIterator, typename _Allocator>
00169     void
00170     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
00171          _Allocator __alloc)
00172     {
00173       for (; __first != __last; ++__first)
00174     __alloc.destroy(&*__first);
00175     }
00176 
00177   template<typename _ForwardIterator, typename _Tp>
00178     inline void
00179     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
00180          allocator<_Tp>)
00181     {
00182       _Destroy(__first, __last);
00183     }
00184 
00185 _GLIBCXX_END_NAMESPACE
00186 
00187 #endif /* _STL_CONSTRUCT_H */
00188 

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