libyui  3.0.10
/usr/src/RPM/BUILD/libyui-3.0.10/src/ImplPtr.h
00001 /*
00002   Copyright (C) 2000-2012 Novell, Inc
00003   This library is free software; you can redistribute it and/or modify
00004   it under the terms of the GNU Lesser General Public License as
00005   published by the Free Software Foundation; either version 2.1 of the
00006   License, or (at your option) version 3.0 of the License. This library
00007   is distributed in the hope that it will be useful, but WITHOUT ANY
00008   WARRANTY; without even the implied warranty of MERCHANTABILITY or
00009   FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
00010   License for more details. You should have received a copy of the GNU
00011   Lesser General Public License along with this library; if not, write
00012   to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
00013   Floor, Boston, MA 02110-1301 USA
00014 */
00015 
00016 
00017 /*-/
00018 
00019   File:       ImplPtr.h
00020 
00021   Author:     Michael Andres <ma@suse.de>
00022 
00023 /-*/
00024 
00025 #ifndef ImplPtr_h
00026 #define ImplPtr_h
00027 
00028 #include <boost/noncopyable.hpp>
00029 #include <boost/scoped_ptr.hpp>
00030 
00031 /**
00032  * Helper template class for implementation pointers (pointers to a private
00033  * class or structure that hold the member variables of a higher-level class
00034  * that is part of a public API).
00035  *
00036  * This pointer class maintains constness of its parent class, i.e. if it is
00037  * used in a const class the class this pointer points to will also be const.
00038  *
00039  * This class automatically deletes the class it points to in its destructor.
00040  **/
00041 template<class _Impl>
00042 class ImplPtr : private boost::noncopyable
00043 {
00044 #if defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) || defined( BOOST_NO_CXX11_NULLPTR )
00045     typedef typename boost::scoped_ptr<_Impl>::unspecified_bool_type unspecified_bool_type;
00046 #endif
00047 
00048 public:
00049     typedef _Impl element_type;
00050 
00051     explicit
00052     ImplPtr( _Impl * impl_r = 0 )    : _impl( impl_r ) {}
00053 
00054 public:
00055     void reset( _Impl * impl_r = 0 ) { _impl.reset( impl_r ); }
00056 
00057     void swap( ImplPtr rhs )         { _impl.swap( rhs._impl ); }
00058 
00059 public:
00060 #if defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) || defined( BOOST_NO_CXX11_NULLPTR )
00061     operator unspecified_bool_type() const { return _impl; }
00062 #else
00063     explicit operator bool () const { return _impl.get() != 0; }
00064 #endif
00065 
00066     const _Impl & operator*()  const { return *_impl; }
00067     const _Impl * operator->() const { return _impl.get(); }
00068     const _Impl * get()        const { return _impl.get(); }
00069 
00070     _Impl &       operator*()        { return *_impl; }
00071     _Impl *       operator->()       { return _impl.get(); }
00072     _Impl *       get()              { return _impl.get(); }
00073 
00074 private:
00075     boost::scoped_ptr<_Impl> _impl;
00076 };
00077 
00078 template<class _Impl>
00079 inline bool operator==( ImplPtr<_Impl> & lhs, ImplPtr<_Impl> & rhs ) { return lhs.get() == rhs.get(); }
00080 
00081 template<class _Impl>
00082 inline bool operator!=( ImplPtr<_Impl> & lhs, ImplPtr<_Impl> & rhs ) { return lhs.get() != rhs.get(); }
00083 
00084 template<class _Impl>
00085 inline bool operator< ( ImplPtr<_Impl> & lhs, ImplPtr<_Impl> & rhs ) { return lhs.get() <  rhs.get(); }
00086 
00087 #endif // ImplPtr_h
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