C++ Function Object

C++ Objects that can be called like a function. They overload the () operator.

include <iostream>
using namespace std;
 
class Greet {
  public:    
    // overload function call/parentheses operator
    void operator()() {
      cout << "Hello World!";
    }
};
 
 
int main() {
  // create an object of Greet class
  Greet greet;
  // call the object as a function
  greet();
  return 0;
}