In C++, a functor(function object) is the object of a class or struct, which we can call a function.
It overloads the function-call operator() so that it allows us to use the object as a function.
class Test
{
public:
void operator()()
{
// function body
}
};
int main()
{
Test temp;
temp();
}
Here in this syntax, we’re overloading the function call operator (). This would help us to call the object just like the function.
#include <iostream>using namespace std;class Test{public:void operator()(){cout << "Basic Example of C++ Functors";}};int main(){Test temp;temp();return 0;}
Line –2: We import the standard input and output libraries.
Line 3: We create a Test class.
Line 6–9: We overload the function call operator (), which simply prints a message.
Line 11: We write a main driver for the program.
Line 13: We create an object of the Test class, which is known as a temp.
Line 14: We call the temp object by using the () operator.