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Postings from August 2012
On Thu, 2012-08-16 at 17:58 -0400, Ricardo Signes wrote:
> So, last year I said "we really ought to cut most of smart match away."
>
> http://www.nntp.perl.org/group/perl.perl5.porters/2011/07/msg174272.html
>
> I've slept on it about 380 times, and I'm still for it. Here's the new plan:
That would be very nice.
> (2) A simple scalar (non-reference, non-glob, non-vstring) on the rhs is
> used for stringwise equality. I have not yet seen any convincing argument
> that we can correctly intuit an eq/== behavior, so we pick one.
Seems sensible. I'd also add an advantage of picking the string equality
test: Very often when I want to compare numbers, I don't just want to
compare equality. I want to compare ranges, if they are larger or
smaller, and so on. I don't do this with strings very often. I do use
string non-equality sometimes, but less often, and that would be solved
by `({...})` below without much overhead.
But of course that's just my use-case.
> I propose that `when(X)` *always* means `$_ ~~ X`. All of the special cases
> for parsing and interpreting the inside of when can go. They can all be
> reduced to `when(sub{...})`. I would also smile upon `when({...})` acting as a
> test block. (Since you can't put a hashref on the rhs of ~~ anymore, there is
> no ambiguity.)
That would make it certainly easier. With regard to `when ({...})`,
would that be a block as in `do {...}`? That would be nicely explicit
and efficient. I might for example not want to `when(sub { ... })` in a
high frequency loop. Being able to just have a block there would speed
that up.
The `when {...} {...}` variant proposed by David Golden would have the
advantage of being "explicitly special" and people might be more
discouraged trying to combine the `{...}` with, for example, junctions.
It'd also mean people having hash references there now can't be
surprised somehow.
> When ~~ works like this, I will use it all the time.
When I use ~~ now, I already use it mostly like you propose (except for
the new syntax bits).
regards,
--
Robert 'phaylon' Sedlacek
Perl 5 Consultant for
Shadowcat Systems Limited - http://shadowcat.co.uk/
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