#include #include template struct empty_type {}; template struct inheritance_chain : empty_type, inheritance_chain {}; template struct inheritance_chain : empty_type {}; template struct unreliable_has_duplicate : std::integral_constant) != 1> {}; int main(int, char*[]) { std::cout << std::boolalpha; std::cout << unreliable_has_duplicate::value << '\n'; std::cout << unreliable_has_duplicate::value << '\n'; std::cout << unreliable_has_duplicate::value << '\n'; return 0; }