On Jul 26, 2006, at 4:55 AM, John Maddock wrote:
Won't bool isnormal(const Person&) be the better overload and therefore the one called? The worst I can see happening is an "ambiguous overload" error.
Fwiw, here's a standalone test. But at this point it's academic as I didn't know about boost::math which I think is probably sufficient protection. #include <iostream> namespace boost { template <class T> bool isnormal(T t) {std::cout << "boost::isnormal\n"; return true;} template<class T> class optional {}; } namespace Mine { struct sense_of_humor {}; struct Person : private boost::optional<sense_of_humor> {}; struct Female : public Person {}; bool isnormal(const Person&) {std::cout << "Mine::isnormal\n"; return false;} bool foo() { Female Jane; return isnormal(Jane); } } int main() { Mine::foo(); } This prints out "boost::isnormal" for me. -Howard