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Postings from October 2005
Re: new sigil
From:
Larry Wall
Date:
October 20, 2005 08:55
Subject:
Re: new sigil
Message ID:
20051020155439.GG4910@wall.org
On Thu, Oct 20, 2005 at 07:56:09AM -0700, Larry Wall wrote:
: I don't know how long this EuroOSCON net is going to stay up, so I'll be
: brief. I think we're having a new "class" sigil. Where we've been
: writing ::T, that will revert to meaning "an existing class T that
: we just might not see the declaration of for dynamic reasons". Instead,
: the new sigil is the cent sign, so ::T is now written ¢T instead.
:
: In addition, it doesn't automatically bind to T like we were making ::T
: do, so you have to use it consistently:
:
: sub sametype (¢T $x, ¢T $y) {...}
Another thing I didn't mention is that that binds both the variable
and its class. But the $ variable is of course optional after the
type, so you could just write that
sub sametype (¢T, ¢T) {...}
if you don't actually care about $x and $y. Basically, ¢T captures
the type of the associated scalar in any lvalue or declarative context,
whether or not hte scalar itself is captured.
Sorry for all the short notes--we still don't know how long this OSCON
net will be up before they take it down.
Larry