41. Method Chaining with this

 Define a class Counter that allows method chaining.

• The class has a private variable value.
• The constructor initializes value to 0.
• Two methods:
  • increment() increases value by 1.
  • decrement() decreases value by 1. 
     

Both methods should return *this so that multiple calls can be chained like:
 c.increment().increment().decrement();

Example

Counter c;
c.increment().increment().decrement();
cout << c.getValue();

Output:

1