Thread: how to use 'this' for different obj in class

can anyone help me to understand how the compiler knows which objects we are refering to in class.
let say there are two objects with the same function methods:
obj a;
obj b;
and there is a function where i need to relate this two objects.of course one of the object will be passed as argument so that's is simple.
but how can i refer back to the other obj eg obj a?

i kind of know we need to use this.but how?

thanks in advance

If you do a.whatever(), then you are calling the member function of a, so all of a's data is right there. If you pass in b, then you will have to access elements of b using dot notation.

thanks! i get it now