[boost] Re: [Variant] Binary visitation and return type

From: Stefan Slapeta (stefan_nospam__at_[hidden])
Date: 2004-12-08 10:51:02

Hartmut Kaiser wrote:

>     struct add_visitor : public ....
>     {
>         long operator()(long t1, long t2)
>         {
>             return t1 + t2;
>         }
>         template <typename T>
>         unsigned long operator()(unsigned long t1, T t2)
>         {
>             return t1 + t2;
>         }
>         template <typename T>
>         unsigned long operator()(T t1, unsigned long t2)
>         {
>             return t1 + t2;
>         }
>     };
> 

BTW, the parameter mix you took here won't work this way. Unfortunately, 
I've never got a binary visitor running without heavily using 
enable_ifs! (I still don't understand what argument type is actually 
passed to a visitor...)

Stefan