auto_ptr.h

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// auto_ptr implementation -*- C++ -*-

// Copyright (C) 2007-2013 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

#ifndef _BACKWARD_AUTO_PTR_H
#define _BACKWARD_AUTO_PTR_H 1

#include <bits/c++config.h>
#include <debug/debug.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  template<typename _Tp1>
    struct auto_ptr_ref
    {
      _Tp1* _M_ptr;
      
      explicit
      auto_ptr_ref(_Tp1* __p): _M_ptr(__p) { }
    } _GLIBCXX_DEPRECATED;


  template<typename _Tp>
    class auto_ptr
    {
    private:
      _Tp* _M_ptr;
      
    public:
      typedef _Tp element_type;
      
      explicit
      auto_ptr(element_type* __p = 0) throw() : _M_ptr(__p) { }

      auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) { }

      template<typename _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<typename _Tp1>
        auto_ptr&
        operator=(auto_ptr<_Tp1>& __a) throw()
        {
      reset(__a.release());
      return *this;
    }

      ~auto_ptr() { delete _M_ptr; }
      
      element_type&
      operator*() const throw() 
      {
    _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
    return *_M_ptr; 
      }
      
      element_type*
      operator->() const throw() 
      {
    _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
    return _M_ptr; 
      }
      
      element_type*
      get() const throw() { return _M_ptr; }
      
      element_type*
      release() throw()
      {
    element_type* __tmp = _M_ptr;
    _M_ptr = 0;
    return __tmp;
      }
      
      void
      reset(element_type* __p = 0) throw()
      {
    if (__p != _M_ptr)
      {
        delete _M_ptr;
        _M_ptr = __p;
      }
      }
      
      auto_ptr(auto_ptr_ref<element_type> __ref) throw()
      : _M_ptr(__ref._M_ptr) { }
      
      auto_ptr&
      operator=(auto_ptr_ref<element_type> __ref) throw()
      {
    if (__ref._M_ptr != this->get())
      {
        delete _M_ptr;
        _M_ptr = __ref._M_ptr;
      }
    return *this;
      }
      
      template<typename _Tp1>
        operator auto_ptr_ref<_Tp1>() throw()
        { return auto_ptr_ref<_Tp1>(this->release()); }

      template<typename _Tp1>
        operator auto_ptr<_Tp1>() throw()
        { return auto_ptr<_Tp1>(this->release()); }
    } _GLIBCXX_DEPRECATED;

  // _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 541. shared_ptr template assignment and void
  template<>
    class auto_ptr<void>
    {
    public:
      typedef void element_type;
    } _GLIBCXX_DEPRECATED;

#if __cplusplus >= 201103L
  template<_Lock_policy _Lp>
  template<typename _Tp>
    inline
    __shared_count<_Lp>::__shared_count(std::auto_ptr<_Tp>&& __r)
    : _M_pi(new _Sp_counted_ptr<_Tp*, _Lp>(__r.get()))
    { __r.release(); }

  template<typename _Tp, _Lock_policy _Lp>
  template<typename _Tp1>
    inline
    __shared_ptr<_Tp, _Lp>::__shared_ptr(std::auto_ptr<_Tp1>&& __r)
    : _M_ptr(__r.get()), _M_refcount()
    {
      __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
      static_assert( sizeof(_Tp1) > 0, "incomplete type" );
      _Tp1* __tmp = __r.get();
      _M_refcount = __shared_count<_Lp>(std::move(__r));
      __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
    }

  template<typename _Tp>
  template<typename _Tp1>
    inline
    shared_ptr<_Tp>::shared_ptr(std::auto_ptr<_Tp1>&& __r)
    : __shared_ptr<_Tp>(std::move(__r)) { }

  template<typename _Tp, typename _Dp>
  template<typename _Up, typename>
    inline
    unique_ptr<_Tp, _Dp>::unique_ptr(auto_ptr<_Up>&& __u) noexcept
    : _M_t(__u.release(), deleter_type()) { }
#endif

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _BACKWARD_AUTO_PTR_H */