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Smells like duck-typing
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Date: 2007-10-18 (15:10)
From: William D. Neumann <wneumann@c...>
Subject: Re: [Caml-list] Smells like duck-typing
On Thu, 18 Oct 2007 09:58:50 -0500, Robert Fischer wrote 

> If you think that a full story as a story with a summary/header,
> and also a body, then you're conceptually into inheritance. 
> From a formal standpoint, you're saying that all full stories
> can be treated as headers/summaries/"blurbs", but not all
> headers/summary/"blurbs" can be treated as full stories. 
> This is equivalent to saying that full stories are a subtype
> of header/summaries/"blurbs".

Well, I think the problem here is that the mental model is reversed with 
respect to the functional model.  Mentally, blurbs are kinds of stories -- 
they are distinguished by their lack of a body.  Using the standard 
inheritance lingo, however, stories are a kind of blurb -- distinguished by 
the inclusion of a body.  Really, it seems like we've got a six of one/half-
dozen of the other situation...


William D. Neumann