# std::integral

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< cpp‎ | concepts

Defined in header `<concepts>` |  |
template< class T > concept integral = std::is_integral_v <T>; |  | (since C++20)

The concept integral<T> is satisfied if and only if `T` is an integral type.

### Example

Run this code

    #include <concepts>
    #include <iostream>

    void print(std::integral auto i)
    {
        std::cout << "Integral: " << i << '\n';
    }

    void print(auto x)
    {
        std::cout << "Non-integral: " << x << '\n';
    }

    int main()
    {
        std::cout << std::boolalpha;

        static_assert(std::integral<bool>);
        print(true);

        static_assert(std::integral<char>);
        print('o');

        static_assert(std::integral<int>);
        print(007);

        static_assert( ! std::integral<double> );
        print(2e2);

        static_assert( ! std::integral<decltype("")> );
        print("∫∫∫");
    }

Output:

    Integral: true
    Integral: o
    Integral: 7
    Non-integral: 200
    Non-integral: ∫∫∫

### References

- C++23 standard (ISO/IEC 14882:2024):

  - 18.4.7 Arithmetic concepts [concepts.arithmetic]

- C++20 standard (ISO/IEC 14882:2020):

  - 18.4.7 Arithmetic concepts [concepts.arithmetic]

### See also

is_integral (C++11) | checks if a type is an integral type (class template)

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