On Monday 11 November 2002 11:45 am, Alexander Nasonov wrote: > This functionality can be usefull but not quite often. I think it's better > to keep 'call' member function for simple use and introduce different name > (call_ex?) for advanced use. So, you can use one of: > > // 1) > template<typename Arg> > bool call(const Arg & a, const Arg & b) const; > // 2 > template<typename Arg> > bool call_ex(const Arg & a, const std::type_info & ta, > const Arg & b, const std::type_info & tb) const; > > Implementation can first try to call 'call_ex' and if it throws internal > exception (default behavoir) then revert to 'call' member-function.
I'm assuming you aren't referring to an actual C++ exception. I would assume that the default behavior of call_ex would be to call the call function in the derived class (assuming you are still planning to use the curiously recurring template pattern). > Current algorithm takes first argument a1 (which holds value v1 of type T1) > and tries to extract T1 & from a2 ... aN. If all extractions are ok then > invoke the foo: This seems like the best approach to me. Doug _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost