AMDG Corrado Zoccolo <czoccolo <at> gmail.com> writes:
BTW, the idea of the hand made vtable born in the discussion with gpd. My first implementation used just one function ptr to encapsulate all the behaviour (with a signature to fit all the methods), and was substantially less efficient than the current solution.
You might find this useful if you want to generalize. http://tinyurl.com/2jap3m (I wrote it when I was trying to solve this same problem a year ago) Basic usage: #include <boost/vtable/make.hpp> #include <boost/vtable/pointer.hpp> struct print_function { typedef void (*function_pointer_type)(const void*); template<class T> stuct apply { static void value(const void* x) { std::cout << *static_cast<const T*>(x); } } }; boost::vtable::pointer< boost::vtable::make<boost::mpl::vector<print_function> >::type
table_type;
table_type table; table.set<double>(); double x = 2.5; void* vp = &x; table.find<function1>()(vp); // prints 2.5 In Christ, Steven Watanabe