From: "John W. Long" <ng@...>
Date: 2005-02-11T13:29:39+09:00
Subject: Re: Building a Better Functor

Trans wrote:
> Hi--
> 
> Just FYI. I do not think this is what one calls a Functor exactly,
> since the object is independent of the method ( please see
> http://jakarta.apache.org/commons/sandbox/functor/ ).
>
 > . . .
 >
>   f = Functor.new { |op, x| x.send(op, x) }
>   f + 1  #=> 2
>   f + 2  #=> 4
>   f + 3  #=> 6
>   f * 1  #=> 1
>   f * 2  #=> 2
>   f * 3  #=> 9
> 
 > . . .

Interesting. So how exactly would you define a functor? What you have 
shown above seems to be an object that knows how to do some kind of 
operation using a user-defined method. Is this how you would define a 
functor?

--
John Long
http://wiseheartdesign.com