Re: [boost] Interest in switch generator

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-02-02 20:24:37

Hi Steven,

Steven Watanabe wrote:
> AMDG
> 
>     Is there any interest in a function template that generates a switch 
> statement?
> 

Yes. I'm interested.

> struct f {
>     typedef void result_type;
>     void operator()(mpl::int_<0>) const {
>        std::cout << "2" << std::endl;
>     }
>     void operator()(mpl::int_<1>) const {
>        std::cout << "1" << std::endl;
>     }
>     void operator()(mpl::int_<5>) const {
>        std::cout << "0" << std::endl;
>     }
> };
> 
> int main() {
>     typedef mpl::vector<mpl::int_<0>, mpl::int_<1>, mpl::int_<5> > cases;
>     switch<cases>(5, f()); //prints 0
>     try {
>         switch<cases>(3, f());
>     } catch(bad_switch&) {}
> }
> 

Is this an interface proposal or just some code to illustrate the idea?

I'd like to have templatized parameters and probably separate function 
objects for the cases rather than shape-shifting overloads...

Regards,
Tobias