Hi, I would like to get feedback on a small typeswitch library I've been working on for some time now. The library is designed to dispatch code (lambdas) based on the actual value of boost::any, boost::variant, and also general polymorphic hierarchies. An example is in order. template <class Poly> void test_poly(Poly& p) { match(p)( [](int i) { std::cout << "int = " << i << "\n"; }, [](double d) { std::cout << "double = " << d << "\n"; }, [](const std::string &s) { std::cout << "string = " << s << "\n"; }, [](std::ostream &o) { std::cout << "found ostream" << "\n"; } ); } int main(void) { std::ios_base &stream = std::cout; boost::any any(std::string("C++ Truths")); boost::variant<int, std::string> var("boost"); double d = 9.99; test_poly(stream); // prints found stream test_poly(any); // prints string = C++ Truths test_poly(d); // prints double = 9.99 test_poly(var) // prints string = boost } The implementation of the library is a little over 250 lines. Check it out here: http://coliru.stacked-crooked.com/a/72597a93b12916d4. clang is the only compiler I've been able to compile it with. It resembles Scala's match statement. Scala's match is way more powerful than what I've been able to achieve with C++ library emulation. It is also quite similar to Stroustrup's "Open and Efficient Typeswitch for C++" ( http://www.stroustrup.com/OOPSLA-typeswitch-draft.pdf) A quick benchmark shows that lambda-based typeswitch is about 4 to 5 times *slower*. If there is sufficient interest, I would be thrilled to contribute this library to boost. I believe it can be further generalized to support n-ary method dispatching. Thoughts? R/ Sumant