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Increment ++ and Decrement -- Operator Overloading in C++
The increment (++) and decrement (--) operators area unit 2 necessary unary operators available in C++. Following example explain how increment (++) operator can be overloaded for prefix as well as postfix usage. Similar way, you can overload operator (--).
Example
#include <iostream>
using namespace std;
class Time {
private:
int hours;
int minutes;
public:
Time(int h, int m) {
hours = h;
minutes = m;
}
void display() {
cout << "H: " << hours << " M:" << minutes <<endl;
}
// overload prefix ++ operator
Time operator++ () {
++minutes; // increment current object
if(minutes >= 60) {
++hours;
minutes -= 60;
}
return Time(hours, minutes);
}
// overload postfix ++ operator
Time operator++( int ) {
Time T(hours, minutes);
// increment current object
++minutes;
if(minutes >= 60) {
++hours;
minutes -= 60;
}
// return old original value
return T;
}
};
int main() {
Time T1(11, 59), T2(10,40);
++T1;
T1.display();
++T1;
T1.display();
T2++;
T2.display();
T2++;
T2.display();
return 0;
}Output
This gives the result −
H: 12 M:0 H: 12 M:1 H: 10 M:41 H: 10 M:42
Updated on: 11-Feb-2020
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