From: Paul Brannan <pbrannan@...>
Date: 2002-10-18T22:42:05+09:00
Subject: Re: Interfaces in Ruby

On Fri, Oct 18, 2002 at 08:13:18PM +0900, Massimiliano Mirra wrote:
> Now some things bug me about that.  First, as it has already been
> discussed in this group, even if a class implements, say, an interface
> that includes openFile(String path), inferring that upon calling a
> file will be opened is still a matter of deduction and trust.  The
> only thing we know for sure is that there is a method called
> `openFile' and that it accepts a String argument.
> 
> Second, is certifying a behaviour really a class's responsibility?

The intent of an interface is not to cerfity a particular behavior.  It
is to certify that the author's intent is for the class to have a
particular behavior.

Paul