I update Multimethod that use boost::unorderd_map. Currently, Multimethod dispatches method in constant-time.
I made a mistake. I didn't know that std::type_info instance is not unique in a program. I had to change boost::any::type and boost::any::holder::type like this; __________________________________________________________ template<typename ValueType> static const std::type_info& any::typeinfo() { static const std::type_info& r(typeid(ValueType)); return r; } const std::type_info & any::type() const { return content ? content->type() : typeinfo<void>(); //return content ? content->type() : typeid(void); } template<typename ValueType> virtual const std::type_info& boost::any::holder<ValueType>::type() const { return typeinfo<ValueType>(); //return typeid(ValueType); } __________________________________________________________ It's necessary to change boost::any to implement multimethod dispatching in constant-time. Regards. Nowake