is_fundamental Template in C++
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:
// C++ program to illustrate // is_fundamental template #include <iostream> #include <type_traits> using namespace std; // main program 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:
// C++ program to illustrate // is_fundamental template #include <iostream> #include <type_traits> using namespace std; // main program 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:
// C++ program to illustrate // is_fundamental template #include <iostream> #include <type_traits> using namespace std; // main program 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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