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- Subject: Re: Delayed evaluation of expressions
- From: steve donovan <steve.j.donovan@...>
- Date: Fri, 1 Jul 2011 08:42:21 +0200
On Fri, Jul 1, 2011 at 8:28 AM, Lorenzo Donati
<[email protected]> wrote:
> it being cheap enough. Reading the objections that occasionally come up to
> that idiom, I got the feeling that people don't think it is so cheap
> (relatively speaking).
If you have a lot of assertions, then it's true that every such
assertion will generate a new closure. It ain't pretty - whether it is
a problem for a particular application is something that only
profiling can tell.
Here's one little extension which could make life easier in a natural
way, borrowed from Perl:
do_something() or fail "something failed!"
That is, to allow expressions as statements[1]. Because of boolean
operator short-circuiting, anything after 'or' will only be evaluated
when something bad happens.
steve d.
[1] http://lua-users.org/wiki/ExpressionsAsStatements
