std::is_literal_type

template< class T >
struct is_literal_type;

(This type trait has been deprecated^[1] and removed^[2] as offering negligible value to generic code.).

If T satisfies all requirements of LiteralType, provides the member constant value equal true. For any other type, value is false.

The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void.

The behavior of a program that adds specializations for is_literal_type or is_literal_type_v (since C++17) is undefined.

Template parameters

Helper variable template

template< class T >
inline constexpr bool is_literal_type_v = is_literal_type<T>::value;

Notes

Only literal types may be used as parameters to or returned from constexpr functions. Only literal classes may have constexpr member functions.

Example

#include <iostream>
#include <type_traits>
 
struct A
{
    int m;
};
 
struct B
{
    virtual ~B();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_literal_type<A>::value << '\n';
    std::cout << std::is_literal_type<B>::value << '\n';
}

true
false

External links