From: Sebastian Hungerecker <sepp2k@...>
Date: 2008-11-15T20:07:17+09:00
Subject: Re: how to call operator as function

Vladimir Fekete wrote:
> operators = { "+" => Fixnum.+,
>               "-" => Fixnum.-,

"+" => Fixnum.instance_method(:+),
"-" => Fixnum.instance_method(:-),

>               "++" => Myclass.++}

There is no ++ operator in ruby and you can't define one.


> op = "+"
>
> result = operators[op](left,right)  if left.class==Fixnum and
> right.class==Fixnum

result = operators[op].bind(left).call(right) if left.is_a?(Fixnum) and 
right.is_a?(Fixnum)


Or you skip the whole thing with the hash and just do:

op = "+"
result = left.send(op, right)


HTH,
Sebastian
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