89 Ambiguous logb(Ambiguous){ return Ambiguous(); }  in logb()  function
1294     static_assert((std::is_same<decltype(std::logb((float)0)), float>::value), "");  in test_logb()
1295     static_assert((std::is_same<decltype(std::logb((bool)0)), double>::value), "");  in test_logb()
1296     static_assert((std::is_same<decltype(std::logb((unsigned short)0)), double>::value), "");  in test_logb()
1297     static_assert((std::is_same<decltype(std::logb((int)0)), double>::value), "");  in test_logb()
1298     static_assert((std::is_same<decltype(std::logb((unsigned int)0)), double>::value), "");  in test_logb()
1299     static_assert((std::is_same<decltype(std::logb((long)0)), double>::value), "");  in test_logb()
1300     static_assert((std::is_same<decltype(std::logb((unsigned long)0)), double>::value), "");  in test_logb()
1301     static_assert((std::is_same<decltype(std::logb((long long)0)), double>::value), "");  in test_logb()
1302     static_assert((std::is_same<decltype(std::logb((unsigned long long)0)), double>::value), "");  in test_logb()
1303     static_assert((std::is_same<decltype(std::logb((double)0)), double>::value), "");  in test_logb()
1304     static_assert((std::is_same<decltype(std::logb((long double)0)), long double>::value), "");  in test_logb()
1307     static_assert((std::is_same<decltype(logb(Ambiguous())), Ambiguous>::value), "");  in test_logb()
1308     assert(std::logb(1) == 0);  in test_logb()