is_integral Class
The latest version of this topic can be found at is_integral Class.
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_tr1__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