is_enum Class
Tests if type is an enumeration.
template<class Ty>
struct is_enum;
Parameters
- Ty
The type to query.
Remarks
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.
Example
// 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::tr1::is_enum<trivial>::value << std::endl;
std::cout << "is_enum<color> == " << std::boolalpha
<< std::tr1::is_enum<color>::value << std::endl;
std::cout << "is_enum<int> == " << std::boolalpha
<< std::tr1::is_enum<int>::value << std::endl;
return (0);
}
is_enum<trivial> == false is_enum<color> == true is_enum<int> == false
Requirements
Header: <type_traits>
Namespace: std::tr1