joel falcou <joel.falcou <at> lri.fr> writes:
You need to chaneg your gramamr so it match a pow_ tag and a terminal<pow_>
Here is my function and the grammar struct INC_TAG { typedef double result_type; double operator()(double no) const { return 1.0+no; } }; template<typename Arg> typename proto::result_of::make_expr< proto::tag::function ,INC_TAG ,Arg
::type inc_(Arg const &arg) { return proto::make_expr<proto::tag::function>(INC_TAG(), arg); }
struct calculator_grammar : proto::or_< proto::plus< calculator_grammar, calculator_grammar > , proto::minus< calculator_grammar, calculator_grammar > , proto::multiplies< calculator_grammar, calculator_grammar > , proto::divides< calculator_grammar, calculator_grammar > , proto::function<proto::terminal<INC_TAG>, calculator_grammar > , proto::terminal< proto::_ > > {}; double d = inc_(_1)(2); // fine double d = inc_(2); // don't work Even though i have added the following in the grammar proto::function<proto::terminal<INC_TAG>, calculator_grammar >