66functors.cpp

/*
    FUNCTORS OR FUNCTION OBJECTS :

    These are functions that behave like objects or functions that are wrapped in the class so that
    it is available like an object.
*/
#include <iostream>
#include <cstring>
#include <fstream>
#include <functional> // --> header file to include to access the function objects
#include <algorithm>  // --> header file to include to access the algorithm functions
using namespace std;

int main()
{
    int array[] = {81, 14, 6, 2, 7, 3};

    // SORTING ALGORITHM TAKES 2 ARGUMENTS, ONE THE FIRST VALUE AND SECOND THE LAST VALUE
    sort(array, array+6); 
    cout<<"Sorting array in ascending order : "<<endl;
    for (int i = 0; i < 6; i++)
    {
        cout<<array[i]<<" ";
    }
    // TO SORT IN DESCENDING ORDER, SORTING TAKES 3 ARGUMENTS
    cout<<endl<<"Sorting in descending order : "<<endl;
    sort(array, array+6, greater<int>());
    // greater is a class function 
    for (int i = 0; i < 6; i++)
    {
        cout<<array[i]<<" ";
    }
    // greater is a function object
    return 0;
}