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 {
00071   template<typename _Tp>
00072     pair<_Tp*, ptrdiff_t>
00073     __get_temporary_buffer(ptrdiff_t __len, _Tp*)
00074     {
00075       if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
00076     __len = INT_MAX / sizeof(_Tp);
00077       
00078       while (__len > 0) 
00079     {
00080       _Tp* __tmp = (_Tp*) std::malloc((std::size_t)__len * sizeof(_Tp));
00081       if (__tmp != 0)
00082         return pair<_Tp*, ptrdiff_t>(__tmp, __len);
00083       __len /= 2;
00084     }
00085       return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
00086     }
00087 
00103   template<typename _Tp>
00104     inline pair<_Tp*,ptrdiff_t>
00105     get_temporary_buffer(ptrdiff_t __len)
00106     { return __get_temporary_buffer(__len, (_Tp*) 0); }
00107 
00115   template<typename _Tp>
00116     void
00117     return_temporary_buffer(_Tp* __p)
00118     { std::free(__p); }
00119 
00127   template<typename _Tp1>
00128     struct auto_ptr_ref
00129     {
00130       _Tp1* _M_ptr;
00131       
00132       explicit
00133       auto_ptr_ref(_Tp1* __p): _M_ptr(__p) { }
00134     };
00135 
00136 
00166   template<typename _Tp>
00167     class auto_ptr
00168     {
00169     private:
00170       _Tp* _M_ptr;
00171       
00172     public:
00174       typedef _Tp element_type;
00175       
00182       explicit
00183       auto_ptr(element_type* __p = 0) throw() : _M_ptr(__p) { }
00184 
00192       auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) { }
00193 
00203       template<typename _Tp1>
00204         auto_ptr(auto_ptr<_Tp1>& __a) throw() : _M_ptr(__a.release()) { }
00205 
00214       auto_ptr&
00215       operator=(auto_ptr& __a) throw()
00216       {
00217     reset(__a.release());
00218     return *this;
00219       }
00220 
00231       template<typename _Tp1>
00232         auto_ptr&
00233         operator=(auto_ptr<_Tp1>& __a) throw()
00234         {
00235       reset(__a.release());
00236       return *this;
00237     }
00238 
00251       ~auto_ptr() { delete _M_ptr; }
00252       
00261       element_type&
00262       operator*() const throw() { return *_M_ptr; }
00263       
00270       element_type*
00271       operator->() const throw() { return _M_ptr; }
00272       
00283       element_type*
00284       get() const throw() { return _M_ptr; }
00285       
00297       element_type*
00298       release() throw()
00299       {
00300     element_type* __tmp = _M_ptr;
00301     _M_ptr = 0;
00302     return __tmp;
00303       }
00304       
00312       void
00313       reset(element_type* __p = 0) throw()
00314       {
00315     if (__p != _M_ptr)
00316       {
00317         delete _M_ptr;
00318         _M_ptr = __p;
00319       }
00320       }
00321       
00333       auto_ptr(auto_ptr_ref<element_type> __ref) throw()
00334       : _M_ptr(__ref._M_ptr) { }
00335       
00336       auto_ptr&
00337       operator=(auto_ptr_ref<element_type> __ref) throw()
00338       {
00339     if (__ref._M_ptr != this->get())
00340       {
00341         delete _M_ptr;
00342         _M_ptr = __ref._M_ptr;
00343       }
00344     return *this;
00345       }
00346       
00347       template<typename _Tp1>
00348         operator auto_ptr_ref<_Tp1>() throw()
00349         { return auto_ptr_ref<_Tp1>(this->release()); }
00350 
00351       template<typename _Tp1>
00352         operator auto_ptr<_Tp1>() throw()
00353         { return auto_ptr<_Tp1>(this->release()); }
00355   };
00356 } // namespace std
00357 
00358 #endif 

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