Equalizer  1.2.1
commandFunc.h
00001 
00002 /* Copyright (c) 2006-2012, Stefan Eilemann <eile@equalizergraphics.com>
00003  *
00004  * This library is free software; you can redistribute it and/or modify it under
00005  * the terms of the GNU Lesser General Public License version 2.1 as published
00006  * by the Free Software Foundation.
00007  *  
00008  * This library is distributed in the hope that it will be useful, but WITHOUT
00009  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00010  * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
00011  * details.
00012  * 
00013  * You should have received a copy of the GNU Lesser General Public License
00014  * along with this library; if not, write to the Free Software Foundation, Inc.,
00015  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00016  */
00017 
00018 #ifndef CO_COMMANDFUNC_H
00019 #define CO_COMMANDFUNC_H
00020 
00021 #include <co/types.h>
00022 #include <co/base/debug.h>
00023 
00024 // If you get a warning in your code, add before in including this file:
00025 //  #pragma warning( disable: 4407 )
00026 // This warning is 'fixed' by https://github.com/Eyescale/Equalizer/issues/100
00027 
00028 namespace co
00029 {
00036     template< typename T > class CommandFunc
00037     {
00038     public:
00039         CommandFunc( T* object, 
00040                      bool (T::*func)( Command& ))
00041             : _object( object ), _func( func ) {}
00042 
00043 
00044         template< typename O > CommandFunc( const CommandFunc< O >& from )
00045                 : _object( _convertThis< O >( from._object )),
00046                   _func( static_cast<bool (T::*)( Command& )>(from._func))
00047             {}
00048 
00049         bool operator()( Command& command )
00050         {
00051             EQASSERT( _object );
00052             EQASSERT( _func );
00053             return (_object->*_func)( command );
00054         }
00055 
00056         void clear() { _object = 0; _func = 0; }
00057         bool isValid() const { return _object && _func; }
00058 
00059         // Can't make private because copy constructor needs access. Can't
00060         // declare friend because C++ does not allow generic template friends in
00061         // template classes.
00062         //private:
00063         T* _object;
00064         bool (T::*_func)( Command& );
00065 
00066     private:
00067         template< class F > T* _convertThis( F* ptr )
00068         {
00069 #ifdef _MSC_VER
00070             // https://github.com/Eyescale/Equalizer/issues/100
00071             return reinterpret_cast< T* >( ptr );
00072 #else
00073             return ptr;
00074 #endif
00075         }
00076     };
00077 
00078     template< typename T >
00079     inline std::ostream& operator << ( std::ostream& os,
00080                                        const CommandFunc<T>& func )
00081     {
00082         if( func.isValid( ))
00083             os << "CommandFunc of " << base::className( func._object );
00084         else
00085             os << "NULL CommandFunc";
00086         return os;
00087     }
00088 }
00089 
00090 #endif //CO_COMMANDFUNC_H
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