_.isIntegral

Check if the given object is integral (from C++11) Checks whether T is an integral type. Provides the member constant value which is equal to true, if T is the type bool, char, char8_t (since C++20), char16_t, char32_t, wchar_t, short, int, long, long long, or any implementation-defined extended integer types, including any signed, unsigned, and cv- qualified variants. Otherwise, value is equal to false. Note: technically `bool` is already an instance of `int`