TExprPlaceHolders.h

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#ifndef TIL_TEXPR_PLACE_HOLDERS_H
#define TIL_TEXPR_PLACE_HOLDERS_H


// includes from TIL library
#include "til/TExprMacros.h"

namespace til { namespace expr {

        class FirstArgument
        {
        public:

                EXPR_RESULT_TYPE( Iterator1 );
                EXPR_ITERATORTYPE( Iterator1 );

    template < class Iterator1 >
    typename TypeStruct<Iterator1>::Type
    operator()(Iterator1 &i1)
    { return i1; }
    
    template < class Iterator1, class Iterator2>
    typename TypeStruct<Iterator1, Iterator2>::Type
    operator()(Iterator1 & i1, Iterator2 &)
    { return i1; }
    
    template < class Iterator1, class Iterator2, class Iterator3 >
    typename TypeStruct<Iterator1, Iterator2, Iterator3>::Type
    operator()(Iterator1 & i1, Iterator2 &, Iterator3 &)
    { return i1; }

    /*
                EXPRFUNC_1ARG( operator(), return i1; );
                EXPRFUNC_2ARG( operator(), return i1; );
                EXPRFUNC_3ARG( operator(), return i1; );                
    */
        };


        class SecondArgument
        {
        public:

                EXPR_RESULT_TYPE( Iterator2 );
                EXPR_ITERATORTYPE( Iterator2 );

    template < class Iterator1, class Iterator2>
    typename TypeStruct<Iterator1, Iterator2>::Type
    operator()(Iterator1 &, Iterator2 & i2)
    { return i2; }
    
    template < class Iterator1, class Iterator2, class Iterator3 >
    typename TypeStruct<Iterator1, Iterator2, Iterator3>::Type
    operator()(Iterator1 &, Iterator2 & i2, Iterator3 &)
    { return i2; }

    /*
                EXPRFUNC_2ARG( operator(), return i2; )
                EXPRFUNC_3ARG( operator(), return i2; )
    */
    
                EXPRFUNC_2ARG_RET( getLValue, return i2; , const Iterator2 & );
                EXPRFUNC_3ARG_RET( getLValue, return i2; , const Iterator2 & );
        };

        class ThirdArgument
        {
        public:

                EXPR_RESULT_TYPE( Iterator3 );
                EXPR_ITERATORTYPE( Iterator3 );

    template < class Iterator1, class Iterator2, class Iterator3 >
    typename TypeStruct<Iterator1, Iterator2, Iterator3>::Type
    operator()(Iterator1 &, Iterator2 &, Iterator3 & i3)
    { return i3; }

                //EXPRFUNC_3ARG( operator(), return i3; )

                EXPRFUNC_3ARG_RET( getLValue, return i3; , const Iterator3 & );
        };

}} // namespace til::expr


#endif