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

// <memory> -*- C++ -*-

// Copyright (C) 2001 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/*
 * Copyright (c) 1997-1999
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */

/** @file std_memory.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _CPP_MEMORY
#define _CPP_MEMORY 1

#pragma GCC system_header

#include <bits/stl_algobase.h>
#include <bits/stl_alloc.h>
#include <bits/stl_construct.h>
#include <bits/stl_iterator_base_types.h> //for iterator_traits
#include <bits/stl_tempbuf.h>
#include <bits/stl_uninitialized.h>
#include <bits/stl_raw_storage_iter.h>

namespace std
{

 template<class _Tp1> struct auto_ptr_ref {
   _Tp1* _M_ptr;
   auto_ptr_ref(_Tp1* __p) : _M_ptr(__p) {}
};

/**
 *  A simple smart pointer providing strict ownership semantics.  (More later.)
*/
template <class _Tp> class auto_ptr {
private:
  _Tp* _M_ptr;

public:
  typedef _Tp element_type;

  explicit auto_ptr(_Tp* __p = 0) throw() : _M_ptr(__p) {}
  auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) {}

  template <class _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw()
    : _M_ptr(__a.release()) {}

  auto_ptr& operator=(auto_ptr& __a) throw() {
    reset(__a.release());
    return *this;
  }

  template <class _Tp1>
  auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() {
    reset(__a.release());
    return *this;
  }
  
  // Note: The C++ standard says there is supposed to be an empty throw
  // specification here, but omitting it is standard conforming.  Its 
  // presence can be detected only if _Tp::~_Tp() throws, but (17.4.3.6/2)
  // this is prohibited.
  ~auto_ptr() { delete _M_ptr; }
 
  _Tp& operator*() const throw() {
    return *_M_ptr;
  }
  _Tp* operator->() const throw() {
    return _M_ptr;
  }
  _Tp* get() const throw() {
    return _M_ptr;
  }
  _Tp* release() throw() {
    _Tp* __tmp = _M_ptr;
    _M_ptr = 0;
    return __tmp;
  }
  void reset(_Tp* __p = 0) throw() {
    if (__p != _M_ptr) {
      delete _M_ptr;
      _M_ptr = __p;
    }    
  }

public:
  auto_ptr(auto_ptr_ref<_Tp> __ref) throw()
    : _M_ptr(__ref._M_ptr) {}

  auto_ptr& operator=(auto_ptr_ref<_Tp> __ref) throw() {
    if (__ref._M_ptr != this->get()) {
      delete _M_ptr;
      _M_ptr = __ref._M_ptr;
    }
    return *this;
  }

  template <class _Tp1> operator auto_ptr_ref<_Tp1>() throw() 
    { return auto_ptr_ref<_Tp>(this->release()); }
  template <class _Tp1> operator auto_ptr<_Tp1>() throw()
    { return auto_ptr<_Tp1>(this->release()); }
};

} // namespace std

#endif /* _CPP_MEMORY */


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