HelenOS sources

is_class           40 uspace/lib/cpp/include/__bits/type_traits/result_of.hpp     struct is_class;
is_class           62 uspace/lib/cpp/include/__bits/type_traits/result_of.hpp             is_class<typename decay<F>::type>::value ||
is_class          224 uspace/lib/cpp/include/__bits/type_traits/type_traits.hpp     inline constexpr bool is_class_v = is_class<T>::value;