Hi I working with tuples, and that tuples are constructed by K elements. For me interesting are 1-st, 2-nd and 3-rd. 0-th and others not. Inside my procedure I want to know what are the types on the positions 1, 2, 3. How can I get them? The example: somewhere in the code: typedef tuple < std::string, double, double, double, int, std::string > Foo; typedef tuple < std::string, long double, long double, long double, long , std::map > Bar; My part: template < typename Tuple > // somethink like: typename Tuple::get_type<1> calculate ( Tuple & t ) { // here I need for some calculations know what are the types // on the positions 1,2,3? }; And proposition of usage: calculate ( /*Foo*/ foo ); calculate ( /*Bar*/ bar ); Best regards, -- |\/\/|   Seweryn Habdank-Wojewódzki `\/\/'