is_literal_type Class
Tests whether a type can be used as a constexpr variable or be constructed, used by, or returned from constexpr functions.
Syntax
template <class T>
struct is_literal_type;
Parameters
T
The type to query.
Remarks
An instance of the type predicate holds true if the type T is a literal type, otherwise it holds false. A literal type is either void, a scalar type, a reference type, an array of literal type, or a literal class type. A literal class type is a class type that has a trivial destructor, is either an aggregate type or has at least one non-move, non-copy constexpr constructor, and all of its base classes and non-static data members are non-volatile literal types. While the type of a literal is always a literal type, the concept of a literal type includes anything that the compiler can evaluate as a constexpr at compile time.
Requirements
Header: <type_traits>
Namespace: std