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How to overload post-decrement operator using non-member or free function in C++?
Post-decrement operator overloading in C++: Using C++ program, here we will learn how to overload post-decrement operator using non-member or free function?
Prerequisite: operator overloading and its rules
Here, we are going to implement a C++ program that will demonstrate operator overloading (post-decrement) using non-member or free member function.
Note: This type of non-member function will access the private member of class. So the function must be friend type (friend function).
Consider the program:
using namespace std;
#include <iostream>
//Sample class to demonstrate operator overloading
class Sample
{
//private data members
private:
int value;
public:
//Parameterized constructor
Sample(int c)
{ value = c;}
//making operator overloading declaration as
//friend function
friend Sample operator--(Sample &S, int);
//printing the value
void printValue()
{
cout<<"Value is : "<<value<<endl;
}
};
//overator overloading function definition
Sample operator--(Sample &S,int)
{
S.value--;
return S;
}
//main program
int main()
{
int i = 0;
//object declaration
//with parameterized constructor calling
Sample S1(100);
for(i=0;i<5;i++)
{
S1--;
S1.printValue();
}
return 0;
}
Output
Value is : 99
Value is : 98
Value is : 97
Value is : 96
Value is : 95