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compile-time check of existness of method of a class
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//g++ 4.9.3 #include <iostream> using yes_meta_t = char; using no_meta_t = char[2]; template <typename T> yes_meta_t& func(T const& obj, decltype(&T::method) = &T::method); template <typename T> no_meta_t& func(...); class X { public: void method(int, int) { } }; int main() { std::cout << std::boolalpha; std::cout << (sizeof(func<X>(std::declval<X>())) == sizeof(yes_meta_t)) << std::endl; }
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