std::is_integral

Checks whether T is an integral type. Provides the member constant value which is equal to true, if T is the type bool, char, char8_t (since C++20), char16_t, char32_t, wchar_t, short, int, long, long long, or any implementation-defined extended integer types, including any signed, unsigned, and cv-qualified variants. Otherwise, value is equal to false.

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

Template parameters

Helper variable template

Example

#include <iostream>
#include <type_traits>
 
class A {};
 
enum E : int {};
 
template <class T>
T f(T i)
{
    static_assert(std::is_integral<T>::value, "Integral required.");
    return i;
}
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_integral<A>::value << '\n';
    std::cout << std::is_integral_v<E> << '\n';
    std::cout << std::is_integral_v<float> << '\n';
    std::cout << std::is_integral_v<int> << '\n';
    std::cout << std::is_integral_v<const int> << '\n';
    std::cout << std::is_integral_v<bool> << '\n';
    std::cout << f(123) << '\n';
}

false
false
false
true
true
true
123

See also