Re: [Boost-users] [parameter] Composing ArgumentPacks

Subject: Re: [Boost-users] [parameter] Composing ArgumentPacks
From: er (erwann.rogard_at_[hidden])
Date: 2009-04-15 12:57:02

> BOOST_PARAMETER_KEYWORD(tag, x)
> BOOST_PARAMETER_KEYWORD(tag, y)
> 
> template<class ArgumentPack>
> void f(ArgumentPack const & args){
>     double x_val = args[x];
>     double y_val = args[y];
> }

     typedef boost::parameter::parameters<
         parameter::required<tag::x>
     > par_x_t;
     typedef boost::parameter::parameters<
         parameter::required<tag::y>
     > par_y_t;

>     double x_val = 9.0;
>     double y_val = 0.1;
>     spec_x_t spec_x;
>     spec_y_t spec_y;
>     f(
>         ( spec_x(x_val),spec_y(y_val))         // (5)
>     ); //no match operator[<unnamed>::x]
> 

Hi All. Am I using Parameter incorrectly in this example?