Re: [boost] Runtime Dynamic Dispatch (boost-dispatch)

From: Sohail Somani (s.somani_at_[hidden])
Date: 2006-10-19 13:37:22

> -----Original Message-----
> From: boost-bounces_at_[hidden] 
> > Cool! Can it do Common Lisp-like dispatch where it calls 
> one function if
> > 0 <= x < 5 and another if 5 <= x < 10?
> 
> Actually, yes! :D
> 
> The following (incomplete) example below should be sufficient:
> 
> struct function_chooser {
>   int operator() (int i) const {
>     if ((i >= 0) && (i < 5))
>       return 0;
>     if ((i >= 5) && (i < 10))
>       return 5;
>     return 11;
>   };
> };
> 
> typedef boost::dispatch::dispatcher<void(), int,
>   boost::dispatch::always_true_validator<int>,
>   function_chooser> dispatcher_t ;
> dispatcher_t d;
> d[0] = &function_1;
> d[5] = &function_2;
> d[11] = &default_function;
> 
> int input;
> std::cin >> input;
> d[input];

Is it not possible at all to have a d(1,2,3) interface?

With the tuples, you are specifying the interface already.

It would be more natural.