NullFunctorImpl.h

 
namespace mel
{
    namespace mpl
    {
        
    #if VARIABLE_NUM_ARGS == VARIABLE_MAX_ARGS
        template < VARIABLE_ARGS>
        class NullFunctor_Base
        {
        public:
            NullFunctor_Base(){};
            template <class F2>
            bool operator == ( const F2& ob2 ) const
            {
                return Conversion<F2, NullFunctor_Base<VARIABLE_ARGS_DECL> >::exists ;
            }
        };
 
        template < VARIABLE_ARGS>
        class NullFunctor 
        : public NullFunctor_Base< VARIABLE_ARGS_DECL>
        {
        public:
            NullFunctor(){};
            void operator()( VARIABLE_ARGS_IMPL )
            {
            }
        };
 
        //specialization for void arguments
        template <>
        class NullFunctor<void> :public NullFunctor_Base<void>
        {
        public:
            NullFunctor(){};
            void operator()( )
            {
            }
        
        };
 
    #else
        template < VARIABLE_ARGS>
        class NullFunctor_Base<VARIABLE_ARGS_DECL,void>
        {
        public:
            NullFunctor_Base(){};
            template <class F2>
            bool operator == ( const F2& ob2 ) const
            {
                return Conversion<F2, NullFunctor_Base<VARIABLE_ARGS_DECL,void> >::exists;
            }
        };
        template < VARIABLE_ARGS >
        class NullFunctor<VARIABLE_ARGS_DECL,void> : public NullFunctor_Base< VARIABLE_ARGS_DECL>
        {
        public:
            NullFunctor(){};
            void operator()( VARIABLE_ARGS_IMPL )
            {
            }
        };
 
 
    #endif
    }
}