ImplPtr.h

/*
  Copyright (C) 2000-2012 Novell, Inc
  This library is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) version 3.0 of the License. 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 Lesser General Public
  License for more details. You should have received a copy of the GNU
  Lesser General Public License along with this library; if not, write
  to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
  Floor, Boston, MA 02110-1301 USA
*/
 
 
/*-/
 
  File:       ImplPtr.h
 
  Author:     Michael Andres <ma@suse.de>
 
/-*/
 
#ifndef ImplPtr_h
#define ImplPtr_h
 
#include <boost/noncopyable.hpp>
#include <boost/scoped_ptr.hpp>

template<class _Impl>
class ImplPtr : private boost::noncopyable
{
#if defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) || defined( BOOST_NO_CXX11_NULLPTR )
    typedef typename boost::scoped_ptr<_Impl>::unspecified_bool_type unspecified_bool_type;
#endif
 
public:
    typedef _Impl element_type;
 
    explicit
    ImplPtr( _Impl * impl_r = 0 )    : _impl( impl_r ) {}
 
public:
    void reset( _Impl * impl_r = 0 ) { _impl.reset( impl_r ); }
 
    void swap( ImplPtr rhs )         { _impl.swap( rhs._impl ); }
 
public:
#if defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) || defined( BOOST_NO_CXX11_NULLPTR )
    operator unspecified_bool_type() const { return _impl; }
#else
    explicit operator bool () const { return _impl.get() != 0; }
#endif
 
    const _Impl & operator*()  const { return *_impl; }
    const _Impl * operator->() const { return _impl.get(); }
    const _Impl * get()        const { return _impl.get(); }
 
    _Impl &       operator*()        { return *_impl; }
    _Impl *       operator->()       { return _impl.get(); }
    _Impl *       get()              { return _impl.get(); }
 
private:
    boost::scoped_ptr<_Impl> _impl;
};
 
template<class _Impl>
inline bool operator==( ImplPtr<_Impl> & lhs, ImplPtr<_Impl> & rhs ) { return lhs.get() == rhs.get(); }
 
template<class _Impl>
inline bool operator!=( ImplPtr<_Impl> & lhs, ImplPtr<_Impl> & rhs ) { return lhs.get() != rhs.get(); }
 
template<class _Impl>
inline bool operator< ( ImplPtr<_Impl> & lhs, ImplPtr<_Impl> & rhs ) { return lhs.get() <  rhs.get(); }
 
#endif // ImplPtr_h