Usin *this with Class and Class&

[jakvrh1]

Can someone approve my theory.

If we use *this with function

Screen &Screen::move(pos r, pos c){
	pos row = r * width;
	cursor = row + c;
	return *this;
}

and

Screen Screen::move(pos r, pos c){
	pos row = r * width;
	cursor = row + c;
	return *this;
}

it is basiclly the same thing, just in first case we don't copy entire object instead we just go to that address that it holds?

[MiiNiPaa]

In first example we are returning reference to the object. That means all further operations on returned value would happen on original object

Screen S;
S.move(10, 10).move(1, 1);  //Moved to the 1, 1 position 

In second example, copy of current object is returned. All operations will change (unnamed) copy.

Screen S;
S.move(10, 10).move(1, 1);  //Moved to the 10, 10 position, second move is essentually no-op (assuming no side effects) 

[jakvrh1]

Thank you!