Tip for Fraction class

[gedamial]

Hey guys, I'm making my own Fraction class.

I have a method that simplifies the fraction by diving numerator and denominator for their G.C.D

Fraction Fraction::Simplify()
{
	int GCD = getGCD(numerator, denominator);
	numerator /= MCD;
	denominator /= MCD;
        return *this;
}

Here i have a doubt. Should I return a copy of the Fraction?

I actually modify the fraction which calls the function, but I want to be also able to do something like this:

Fraction newFrac = oldFrac.Simplify();

// or even
cout << newFrac.Simplify();

In this cases, is the return-by-copy worth it? Or should I return by reference?

[Moschops]

is the return-by-copy worth it?

In what sense? As far as I can tell, the only benefit of what you're doing is a tiny bit less typing, so you don't have to do this:

oldFrac.Simplify();
Fraction newFrac = oldFrac;

[gedamial]

Should I return *this by reference or by copy?

[cire]

Since you're modifying the object, return a reference. There is no reason to both modify the original object and force the creation of a new object.