std::is_enum Template in C++
Last Updated :
19 Nov, 2018
The std::is_enum template of C++ STL is used to check whether the given type is enum or not. It returns a boolean value showing the same.
Syntax:
template <class T> struct is_enum;
Parameter: This template accepts single parameter T (Trait class) to check whether T is a enumeration type or not.
Return Value: This template returns a boolean value as shown below:
- True: if the type is a enumeration.
- False: if the type is a non-enumeration.
Below programs illustrate the std::is_enum template in C++:
Program 1::
#include <iostream>
#include <type_traits>
using namespace std;
class GFG1 {
};
enum class GFG2 { var1,
var2,
var3,
var4
};
int main()
{
cout << boolalpha;
cout << "is_enum:" << endl;
cout << "GFG1: "
<< is_enum<GFG1>::value << endl;
cout << "GFG2: "
<< is_enum<GFG2>::value << endl;
return 0;
}
|
Output:
is_enum:
GFG1: false
GFG2: true
Program 2::
#include <iostream>
#include <type_traits>
using namespace std;
class GFG1 {
};
enum class GFG2 : int {};
int main()
{
cout << boolalpha;
cout << "is_enum:" << endl;
cout << "GFG1: "
<< is_enum<GFG1>::value << '\n' ;
cout << "GFG2: "
<< is_enum<GFG2>::value << '\n' ;
cout << "int: "
<< is_enum< int >::value << '\n' ;
return 0;
}
|
Output:
is_enum:
GFG1: false
GFG2: true
int: false
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