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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/language/../types/is_literal_type.html below:

std::is_literal_type - cppreference.com

template< class T > struct is_literal_type;

(since C++11)
(deprecated in C++17)
(removed in C++20)

std::is_literal_type is a UnaryTypeTrait.

(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 to true. For any other type, value is false.

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

If the program adds specializations for std::is_literal_type or std::is_literal_type_v, the behavior is undefined.

[edit] Template parameters [edit] Helper variable template

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

(since C++17)
(deprecated)
(removed in C++20) Inherited from std::integral_constant Member constants true if T is a literal type, false otherwise
(public static member constant) Member functions converts the object to bool, returns value
(public member function) returns value
(public member function) Member types [edit] Notes

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

[edit] Example

#include <type_traits>
 
struct A { int m; };
static_assert(std::is_literal_type_v<A> == true);
 
struct B { virtual ~B(); };
static_assert(std::is_literal_type_v<B> == false);
 
int main() {}

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 2015 C++11 T could be an array of incomplete
class type with unknown bound the behavior is
undefined in this case [edit] External links

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