From: Paul Brannan <paul@...>
Date: 2001-12-11T01:44:49+09:00
Subject: [ruby-talk:28101] Re: Ensuring a specific type

On Tue, Dec 11, 2001 at 01:39:46AM +0900, Fabian Senftenberg wrote:
> Is there any way I can make sure that an expression (a block) is of a
> specific type? Suppose, I have a fancy little class like the
> following:
> 
> class Interval
>   @start = Time.new()
>   @duration = 0

This is not correct.  You should not initialize instance variables here.

>   def initialize(s, d = 0)
>     @start = s
>     @duration = d

Instead, you should initialize them here.

>   end
> 
>   def end()
>     return #{@start + @duration}.usec
>   end
> end

Paul