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A function object is an instance of a class that defines the overloaded operator ().  In this way, it can be used to call a
function.  In the example below, it is used with a template function to display output for whatever is passed to it by
reference.

#include <iostream>

using namespace std;
template<class T>

class PrintMe    {
public:
    void operator()(const T & t)
    {
	 cout << t << " ";
    }
};
int main()
{

    //We'll create a function that works like the old C printf() fucntion 
    PrintMe<int> PrintThis;
    for(int i = 0; i < 5; ++i)
	PrintThis(i);

    return 0;
}
Output:   0 1 2 3 4

 

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