is_integral Class

 

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Tests if type is integral.

template <class Ty>  
struct is_integral;  

Parameters

Ty
The type to query.

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.

// 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  

Header: <type_traits>

Namespace: std

<type_traits>
is_enum Class
is_floating_point Class

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