is_fundamental Template in C++
Last Updated :
19 Nov, 2018
The is_fundamental template of C++ STL is used to check whether the type is a fundamental type or not. It returns a boolean value showing the same.
Syntax:
template <class T> struct is_fundamental;
Parameter: This template accepts a single parameter T (Trait class) to check whether T is a fundamental type or not.
Return Value: This template returns a boolean value as shown below:
- True: if the type is a fundamental.
- False: if the type is a non-fundamental.
Below programs illustrate the is_fundamental template in C++ STL:
Program 1:
#include <iostream>
#include <type_traits>
using namespace std;
class GFG {
};
int main()
{
cout << boolalpha;
cout << "is_fundamental:"
<< '\n' ;
cout << "GFG :"
<< is_fundamental<GFG>::value
<< '\n' ;
cout << "int :"
<< is_fundamental< int >::value
<< '\n' ;
cout << "int& :"
<< is_fundamental< int &>::value
<< '\n' ;
cout << "int* :"
<< is_fundamental< int *>::value
<< '\n' ;
return 0;
}
|
Output:
is_fundamental:
GFG :false
int :true
int& :false
int* :false
Program 2:
#include <iostream>
#include <type_traits>
using namespace std;
int main()
{
cout << boolalpha;
cout << "is_fundamental:"
<< '\n' ;
cout << "float:"
<< is_fundamental< float >::value
<< '\n' ;
cout << "float&:"
<< is_fundamental< float &>::value
<< '\n' ;
cout << "float*:"
<< is_fundamental< float *>::value
<< '\n' ;
cout << "double:"
<< is_fundamental< double >::value
<< '\n' ;
cout << "double&:"
<< is_fundamental< double &>::value
<< '\n' ;
cout << "double*:"
<< is_fundamental< double *>::value
<< '\n' ;
return 0;
}
|
Output:
is_fundamental:
float:true
float&:false
float*:false
double:true
double&:false
double*:false
Program 3:
#include <iostream>
#include <type_traits>
using namespace std;
int main()
{
cout << boolalpha;
cout << "is_fundamental:"
<< '\n' ;
cout << "char:"
<< is_fundamental< char >::value
<< '\n' ;
cout << "char&:"
<< is_fundamental< char &>::value
<< '\n' ;
cout << "char*:"
<< is_fundamental< char *>::value
<< '\n' ;
cout << "void :"
<< is_fundamental< void >::value
<< '\n' ;
return 0;
}
|
Output:
is_fundamental:
char:true
char&:false
char*:false
void :true
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