std::is_literal_type (3) - Linux Manuals

std::is_literal_type: std::is_literal_type


std::is_literal_type - std::is_literal_type


Defined in header <type_traits>
template< class T > (since C++11)
struct is_literal_type; (deprecated in C++17)
                                 (removed in C++20)

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.

Template parameters

T - a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_literal_type_v = is_literal_type<T>::value; (deprecated)
                                                                      (removed in C++20)

Inherited from std::integral_constant

Member constants

value true if T is a literal type , false otherwise
         (public static member constant)

Member functions

              converts the object to bool, returns value
operator bool (public member function)

operator() returns value
              (public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>


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


// Run this code

  #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';



See also