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From: Dario Teixeira <darioteixeira@yahoo.com>
To: skaller <skaller@users.sourceforge.net>,
	Brian Hurt <bhurt@janestcapital.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Smells like duck-typing
Date: Thu, 18 Oct 2007 17:30:44 +0100 (BST)	[thread overview]
Message-ID: <961666.5110.qm@web54601.mail.re2.yahoo.com> (raw)
In-Reply-To: <1192724551.5999.37.camel@rosella.wigram>

> No it isn't, its just mis-stated. What he actually wants is projections,
> which are perfectly sound. That is, given a concrete record with N
> fields, a collection of *views* which only expose a subset of the
> fields.
> 
> More generally, not just a subset of fields, but a new record
> which is the image of a epimorphism (a structure preserving
> surjection or 'onto' mapping).
 
Hi,

I wasn't familiar with the "projections" terminology, but that is
precisely what I meant, and what I've referred to as "marble carving"!
(The wheel keeps getting reinvented...)

Incidentally, are projections implemented by any language out there?
(I realise that to a certain extent, SQL views are also projections.
But what about other examples?)

Cheers,
Dario





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  reply	other threads:[~2007-10-18 16:30 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-17 13:35 Dario Teixeira
2007-10-17 14:13 ` [Caml-list] " Arnaud Spiwack
2007-10-17 14:47   ` Dario Teixeira
2007-10-17 14:25 ` Daniel Bünzli
2007-10-17 15:03   ` skaller
2007-10-17 15:13     ` Dario Teixeira
2007-10-17 15:25       ` Arnaud Spiwack
2007-10-17 15:32       ` Daniel Bünzli
2007-10-17 16:21         ` Chris King
2007-10-18  7:28           ` Stefano Zacchiroli
2007-10-18  8:33             ` [ANN] pa_oo and pa_polymap for 3.10 (Re: [Caml-list] Smells like duck-typing) Jacques Garrigue
2007-10-17 16:57         ` [Caml-list] Smells like duck-typing skaller
2007-10-17 16:52       ` skaller
2007-10-17 16:59         ` Robert Fischer
2007-10-17 14:33 ` Chris King
2007-10-17 14:59   ` Dario Teixeira
2007-10-17 15:24 ` Vincent Aravantinos
2007-10-17 15:26 ` Zheng Li
2007-10-18 16:13   ` Zheng Li
2007-10-18 16:37     ` [Caml-list] " William D. Neumann
2007-10-19  0:58       ` Jacques Garrigue
2007-10-17 19:59 ` [Caml-list] " Richard Jones
2007-10-17 20:24 ` Dario Teixeira
2007-10-18  7:37   ` Stefano Zacchiroli
2007-10-18 10:31     ` Dario Teixeira
2007-10-18 10:37       ` Stefano Zacchiroli
2007-10-18 13:28       ` Robert Fischer
2007-10-18 14:10         ` Dario Teixeira
2007-10-18 14:18           ` Brian Hurt
2007-10-18 14:29             ` Arnaud Spiwack
2007-10-18 14:45               ` Brian Hurt
2007-10-18 15:02                 ` Arnaud Spiwack
2007-10-18 15:07                   ` Robert Fischer
2007-10-18 15:14                     ` Arnaud Spiwack
2007-10-18 16:39                   ` skaller
2007-10-18 16:49                     ` Arnaud Spiwack
2007-10-18 17:47                       ` skaller
2007-10-18 19:55                         ` Robert Fischer
2007-10-18 16:22                 ` skaller
2007-10-18 16:30                   ` Dario Teixeira [this message]
2007-10-18 14:58           ` Robert Fischer
2007-10-18 15:11             ` William D. Neumann
2007-10-18 15:47               ` Loup Vaillant
2007-10-18 16:08                 ` William D. Neumann
2007-10-19 13:08               ` Ed Keith
2007-10-18 16:24           ` Dario Teixeira
2007-10-18 16:35             ` Vincent Aravantinos
2007-10-18 16:43             ` Brian Hurt
2007-10-18 17:04               ` William D. Neumann
2007-10-18 17:05               ` Dario Teixeira
2007-10-18 17:22                 ` Brian Hurt
2007-10-18 17:58                   ` Dario Teixeira
2007-10-18 15:42 ` Vincent Aravantinos
     [not found] <47161E3B.3060704@tsc.uc3m.es>
2007-10-17 15:01 ` Dario Teixeira
2007-10-17 20:20   ` Alain Frisch

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