is_enum Class


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Tests if type is an enumeration.

template <class Ty>  
struct is_enum;  


The type to query.

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

// std_tr1__type_traits__is_enum.cpp   
// compile with: /EHsc   
#include <type_traits>   
#include <iostream>   
struct trivial   
    int val;   
enum color {   
    red, greed, blue};   
int main()   
    std::cout << "is_enum<trivial> == " << std::boolalpha   
        << std::is_enum<trivial>::value << std::endl;   
    std::cout << "is_enum<color> == " << std::boolalpha   
        << std::is_enum<color>::value << std::endl;   
    std::cout << "is_enum<int> == " << std::boolalpha   
        << std::is_enum<int>::value << std::endl;   
    return (0);   

is_enum<trivial> == false  
is_enum<color> == true  
is_enum<int> == false  

Header: <type_traits>

Namespace: std

is_integral Class