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

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