std::is_literal_type - Man Page

typedef integral_constant< bool, __v > type
typedef bool value_type

constexpr operator value_type () const noexcept
constexpr value_type operator() () const noexcept

static constexpr bool value

struct std::is_literal_type< _Tp >"is_literal_type

Deprecated

Deprecated in C++17, removed in C++20. The idea of a literal type isn't useful.