From: Brian Candler <b.candler@...>
Date: 2011-10-04T23:03:11+09:00
Subject: Re: Operator Overloading

Darryl Pierce wrote in post #1024950:
> Define a + method on your Point class:
>
> def +(other)
>   self.x += other.x
>   self.y += other.y
>   self.z += other.z
>   self
> end

Warning!! That will *mutate* the point passed as the left-hand argument 
of the '+'!

I would suggest instead:

def +(other)
  Point.new(x+other.x, y+other.y, z+other.z)
end

(Of course, 'x' and 'self.x' are the same; you can write 'self.x' if you 
think it's clearer)

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