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From: "Stefan Monnier" <monnier+gnu/emacs@RUM.cs.yale.edu>
Cc: "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu>,
	Jason Rumney <jasonr@gnu.org>,
	rms@gnu.org, emacs-devel@gnu.org
Subject: Re: featurep
Date: Tue, 19 Mar 2002 19:03:44 -0500	[thread overview]
Message-ID: <200203200003.g2K03ik09249@rum.cs.yale.edu> (raw)
In-Reply-To: 5xwuw8xgo7.fsf@kfs2.cua.dk

> "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu> writes:
> 
> > > Ok, but if you combine :family 'local and :datagram t, and
> > > make-network-process returns nil, you really don't know whether it's
> > > because it doesn't support local sockets or datagrams -- so what would
> > > you try next?
> > 
> > Why does it matter ?
> > What would the code look like using your :feature thing ?
> 
> Probably not a lot different, but without checking for a feature
> first, the current code will throw an error for an unsupported feature
> indicating (in clear text) what the problem is.

That's perfectly fine.  I never actually suggested to rely on a `nil'
return value.  I definitely prefer signalling an error, just make
sure that you use a signal that makes the problem clear like
`unsupported-network-feature' so that the signal handler can
distinguish it from other problems.


	Stefan


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  reply	other threads:[~2002-03-20  0:03 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <200203190844.g2J8iOq09224@wijiji.santafe.edu>
2002-03-19 13:39 ` featurep Kim F. Storm
2002-03-19 19:24   ` featurep Jason Rumney
2002-03-19 21:20     ` featurep Stefan Monnier
2002-03-19 23:09       ` featurep Kim F. Storm
2002-03-19 23:19         ` featurep Stefan Monnier
2002-03-19 23:48           ` featurep Kim F. Storm
2002-03-20  0:03             ` Stefan Monnier [this message]
2002-03-19 22:59     ` featurep Kim F. Storm
2002-03-21  9:04     ` featurep Richard Stallman
2002-03-21 13:12       ` featurep Kim F. Storm
2002-03-23  2:35         ` featurep Richard Stallman
2002-03-21 16:44       ` featurep Stefan Monnier
2002-03-21 19:47         ` featurep Kim F. Storm
2002-03-22  0:39           ` featurep Stefan Monnier
2002-03-22  9:14             ` featurep Kim F. Storm

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