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is_fundamental Template in C++
In this article we will be discussing the working, syntax and examples of std::is_fundamental template in C++ STL.
is_ fundamental is a template which comes under the <type_traits> header file. This template is used to check whether the given type T is a fundamental data type or not.
What is Fundamental type?
Fundamental types are the built-in types which are already declared in the compiler itself. Like int, float, char, double, etc. These are also known as built-in data types.
All the data types which are user-defined like: class, enum, struct, references or pointers, are not part of the fundamental type.
Syntax
template <class T> is_fundamental;
Parameters
The template can have only parameter of type T, and check whether the given type is a final class type or not.
Return value
It returns a Boolean value, true if the given type is a fundamental data type, and false if the given type is not a fundamental data type.
Example
Input: class final_abc; is_fundamental<final_abc>::value; Output: False Input: is_fundamental<int>::value; Output: True Input: is_fundamental<int*>::value; Output: False
Example
#include <iostream>
#include <type_traits>
using namespace std;
class TP {
//TP Body
};
int main() {
cout << boolalpha;
cout << "checking for is_fundamental:";
cout << "\nTP: "<< is_fundamental<TP>::value;
cout << "\nchar :"<< is_fundamental<char>::value;
cout << "\nchar& :"<< is_fundamental<char&>::value;
cout << "\nchar* :"<< is_fundamental<char*>::value;
return 0;
}Output
If we run the above code it will generate the following output −
checking for is_fundamental: TP: false char : true char& : false char* : false
Example
#include <iostream>
#include <type_traits>
using namespace std;
int main() {
cout << boolalpha;
cout << "checking for is_fundamental:";
cout << "\nint: "<< is_fundamental<int>::value;
cout << "\ndouble :"<< is_fundamental<double>::value;
cout << "\nint& :"<< is_fundamental<int&>::value;
cout << "\nint* :"<< is_fundamental<int*>::value;
cout << "\ndouble& :"<< is_fundamental<double&>::value;
cout << "\ndouble* :"<< is_fundamental<double*>::value;
return 0;
}Output
If we run the above code it will generate the following output −
checking for is_fundamental: int: true double : true int& : false int* : false double& : false double* : false
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