From: Mark Hubbart <discordantus@...>
Date: 2004-11-13T15:10:41+09:00
Subject: Re: Are +, -, +=, -=, etc. redefinable methods?

Hi,

On Sat, 13 Nov 2004 13:39:31 +0900, trans.  (T. Onoma)
<transami@runbox.com> wrote:
> On Friday 12 November 2004 11:13 pm, itsme213 wrote:
> | If so, is there some magic syntax to define them?
> |
> | Thanks!
> 
> -= and += are special forms that represent:
> 
>   y -= x   ~>   y = y - x
>   y += x   ~>   y = y + x
> 
> A number of other infix operators can be used in the same way. So these are
> not redefinable independent of + and -.
> 
> + and - on the otherhand has two forms, infix and unary. (Unary means prefix
> operator.)

Also, for a chart of all the operators and details on their
method-ness, look here:
http://phrogz.net/ProgrammingRuby/language.html#operatorexpressions

cheers,
Mark