libstdc++-v3/include/std/std_memory.h

   1 // <memory> -*- C++ -*-
   2
   3 // Copyright (C) 2001 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 /*
  31  * Copyright (c) 1997-1999
  32  * Silicon Graphics Computer Systems, Inc.
  33  *
  34  * Permission to use, copy, modify, distribute and sell this software
  35  * and its documentation for any purpose is hereby granted without fee,
  36  * provided that the above copyright notice appear in all copies and
  37  * that both that copyright notice and this permission notice appear
  38  * in supporting documentation.  Silicon Graphics makes no
  39  * representations about the suitability of this software for any
  40  * purpose.  It is provided "as is" without express or implied warranty.
  41  *
  42  */
  43
  44 /** @file std_memory.h
  45  *  This is an internal header file, included by other library headers.
  46  *  You should not attempt to use it directly.
  47  */
  48
  49 #ifndef _CPP_MEMORY
  50 #define _CPP_MEMORY 1
  51
  52 #pragma GCC system_header
  53
  54 #include <bits/stl_algobase.h>
  55 #include <bits/stl_alloc.h>
  56 #include <bits/stl_construct.h>
  57 #include <bits/stl_iterator_base_types.h> //for iterator_traits
  58 #include <bits/stl_tempbuf.h>
  59 #include <bits/stl_uninitialized.h>
  60 #include <bits/stl_raw_storage_iter.h>
  61
  62 namespace std
  63 {
  64
  65  template<class _Tp1> struct auto_ptr_ref {
  66    _Tp1* _M_ptr;
  67    auto_ptr_ref(_Tp1* __p) : _M_ptr(__p) {}
  68 };
  69
  70 /**
  71  *  A simple smart pointer providing strict ownership semantics.  (More later.)
  72 */
  73 template <class _Tp> class auto_ptr {
  74 private:
  75   _Tp* _M_ptr;
  76
  77 public:
  78   typedef _Tp element_type;
  79
  80   explicit auto_ptr(_Tp* __p = 0) throw() : _M_ptr(__p) {}
  81   auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) {}
  82
  83   template <class _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw()
  84     : _M_ptr(__a.release()) {}
  85
  86   auto_ptr& operator=(auto_ptr& __a) throw() {
  87     reset(__a.release());
  88     return *this;
  89   }
  90
  91   template <class _Tp1>
  92   auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() {
  93     reset(__a.release());
  94     return *this;
  95   }
  96
  97   // Note: The C++ standard says there is supposed to be an empty throw
  98   // specification here, but omitting it is standard conforming.  Its
  99   // presence can be detected only if _Tp::~_Tp() throws, but (17.4.3.6/2)
 100   // this is prohibited.
 101   ~auto_ptr() { delete _M_ptr; }
 102
 103   _Tp& operator*() const throw() {
 104     return *_M_ptr;
 105   }
 106   _Tp* operator->() const throw() {
 107     return _M_ptr;
 108   }
 109   _Tp* get() const throw() {
 110     return _M_ptr;
 111   }
 112   _Tp* release() throw() {
 113     _Tp* __tmp = _M_ptr;
 114     _M_ptr = 0;
 115     return __tmp;
 116   }
 117   void reset(_Tp* __p = 0) throw() {
 118     if (__p != _M_ptr) {
 119       delete _M_ptr;
 120       _M_ptr = __p;
 121     }
 122   }
 123
 124 public:
 125   auto_ptr(auto_ptr_ref<_Tp> __ref) throw()
 126     : _M_ptr(__ref._M_ptr) {}
 127
 128   auto_ptr& operator=(auto_ptr_ref<_Tp> __ref) throw() {
 129     if (__ref._M_ptr != this->get()) {
 130       delete _M_ptr;
 131       _M_ptr = __ref._M_ptr;
 132     }
 133     return *this;
 134   }
 135
 136   template <class _Tp1> operator auto_ptr_ref<_Tp1>() throw()
 137     { return auto_ptr_ref<_Tp>(this->release()); }
 138   template <class _Tp1> operator auto_ptr<_Tp1>() throw()
 139     { return auto_ptr<_Tp1>(this->release()); }
 140 };
 141
 142 } // namespace std
 143
 144 #endif /* _CPP_MEMORY */
 145
 146
 147 // Local Variables:
 148 // mode:C++
 149 // End: