memory

00001 // <memory> -*- 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  * Copyright (c) 1997-1999
00032  * Silicon Graphics Computer Systems, Inc.
00033  *
00034  * Permission to use, copy, modify, distribute and sell this software
00035  * and its documentation for any purpose is hereby granted without fee,
00036  * provided that the above copyright notice appear in all copies and
00037  * that both that copyright notice and this permission notice appear
00038  * in supporting documentation.  Silicon Graphics makes no
00039  * representations about the suitability of this software for any
00040  * purpose.  It is provided "as is" without express or implied warranty.
00041  *
00042  */
00043 
00049 #ifndef _CPP_MEMORY
00050 #define _CPP_MEMORY 1
00051 
00052 #pragma GCC system_header
00053 
00054 #include <bits/stl_algobase.h>
00055 #include <bits/stl_alloc.h>
00056 #include <bits/stl_construct.h>
00057 #include <bits/stl_iterator_base_types.h> //for iterator_traits
00058 #include <bits/stl_uninitialized.h>
00059 #include <bits/stl_raw_storage_iter.h>
00060 
00061 namespace std
00062 {
00063 
00070   template <class _Tp>
00071   pair<_Tp*, ptrdiff_t> 
00072   __get_temporary_buffer(ptrdiff_t __len, _Tp*)
00073   {
00074     if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
00075       __len = INT_MAX / sizeof(_Tp);
00076 
00077     while (__len > 0) {
00078       _Tp* __tmp = (_Tp*) std::malloc((std::size_t)__len * sizeof(_Tp));
00079       if (__tmp != 0)
00080     return pair<_Tp*, ptrdiff_t>(__tmp, __len);
00081       __len /= 2;
00082     }
00083 
00084     return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
00085   }
00086 
00102   template <class _Tp>
00103   inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) {
00104     return __get_temporary_buffer(__len, (_Tp*) 0);
00105   }
00106 
00114   template <class _Tp>
00115   void return_temporary_buffer(_Tp* __p) {
00116     std::free(__p);
00117   }
00118 
00119 
00120 template <class _Tp1>
00121   struct auto_ptr_ref
00122 {
00123    _Tp1* _M_ptr;
00124    auto_ptr_ref(_Tp1* __p) : _M_ptr(__p) {}
00125 };
00126 
00130 template <class _Tp>
00131   class auto_ptr
00132 {
00133 private:
00134   _Tp* _M_ptr;
00135 
00136 public:
00137   typedef _Tp element_type;
00138 
00139   explicit auto_ptr(_Tp* __p = 0) throw() : _M_ptr(__p) {}
00140   auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) {}
00141 
00142   template <class _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw()
00143     : _M_ptr(__a.release()) {}
00144 
00145   auto_ptr& operator=(auto_ptr& __a) throw() {
00146     reset(__a.release());
00147     return *this;
00148   }
00149 
00150   template <class _Tp1>
00151   auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() {
00152     reset(__a.release());
00153     return *this;
00154   }
00155   
00156   // Note: The C++ standard says there is supposed to be an empty throw
00157   // specification here, but omitting it is standard conforming.  Its 
00158   // presence can be detected only if _Tp::~_Tp() throws, but (17.4.3.6/2)
00159   // this is prohibited.
00160   ~auto_ptr() { delete _M_ptr; }
00161  
00162   _Tp& operator*() const throw() {
00163     return *_M_ptr;
00164   }
00165   _Tp* operator->() const throw() {
00166     return _M_ptr;
00167   }
00168   _Tp* get() const throw() {
00169     return _M_ptr;
00170   }
00171   _Tp* release() throw() {
00172     _Tp* __tmp = _M_ptr;
00173     _M_ptr = 0;
00174     return __tmp;
00175   }
00176   void reset(_Tp* __p = 0) throw() {
00177     if (__p != _M_ptr) {
00178       delete _M_ptr;
00179       _M_ptr = __p;
00180     }    
00181   }
00182 
00183 public:
00184   auto_ptr(auto_ptr_ref<_Tp> __ref) throw()
00185     : _M_ptr(__ref._M_ptr) {}
00186 
00187   auto_ptr& operator=(auto_ptr_ref<_Tp> __ref) throw() {
00188     if (__ref._M_ptr != this->get()) {
00189       delete _M_ptr;
00190       _M_ptr = __ref._M_ptr;
00191     }
00192     return *this;
00193   }
00194 
00195   template <class _Tp1> operator auto_ptr_ref<_Tp1>() throw() 
00196     { return auto_ptr_ref<_Tp>(this->release()); }
00197   template <class _Tp1> operator auto_ptr<_Tp1>() throw()
00198     { return auto_ptr<_Tp1>(this->release()); }
00199 };
00200 
00201 } // namespace std
00202 
00203 #endif /* _CPP_MEMORY */
00204 

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