C++ std::is_void
Description:
The std::is_void template of C++ STL is used to check whether the type is void or not.
Syntax:
template <class T> struct is_void;
Parameter:
It takes T as a parameter and check if T is a void or not.
Return Value:
std::is_void template returns a boolean value as shown below:
- True: if the type is a void.
- False: if the type is a non-void.
Code:
using namespace std;
int main()
{
cout << boolalpha;
cout << "is_void:"<< '\n';
cout << "void:"<< is_void<void>::value << '\n';
cout << "const void:"<< is_void<const void>::value << '\n';
cout << "int:"<< is_void<int>::value << '\n';
cout << "char:"<< is_void<char>::value << '\n';
cout << "float:"<< is_void<float>::value << '\n';
return 0;
}
Output:
is_void:
void:true
const void:true
int:false
char:false
float:false
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