is_integral Class

Article
08/03/2021

Tests if type is integral.

Syntax

template <class Ty>
struct is_integral;

Parameters

Ty
The type to query.

Remarks

An instance of the type predicate holds true if the type Ty is one of the integral types, or a cv-qualified form of one of the integral types, otherwise it holds false.

An integral type is one of bool, char, unsigned char, signed char, wchar_t, short, unsigned short, int, unsigned int, long, and unsigned long. In addition, with compilers that provide them, an integral type can be one of long long, unsigned long long, __int64, and unsigned __int64.

Example

// std__type_traits__is_integral.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>

struct trivial
    {
    int val;
    };

int main()
    {
    std::cout << "is_integral<trivial> == " << std::boolalpha
        << std::is_integral<trivial>::value << std::endl;
    std::cout << "is_integral<int> == " << std::boolalpha
        << std::is_integral<int>::value << std::endl;
    std::cout << "is_integral<float> == " << std::boolalpha
        << std::is_integral<float>::value << std::endl;

    return (0);
    }

is_integral<trivial> == false
is_integral<int> == true
is_integral<float> == false

Requirements

Header: <type_traits>

Namespace: std