From grant at mclean.net.nz  Mon Aug  4 19:49:03 2014
From: grant at mclean.net.nz (Grant McLean)
Date: Tue, 05 Aug 2014 14:49:03 +1200
Subject: [Wellington-pm] Meeting next Tuesday
Message-ID: <1407206943.2851.107.camel@putnam.wgtn.cat-it.co.nz>

Hi Mongers

The August meeting of Wellington Perl Mongers is on next Tuesday.  Usual
place and time:

    6:00pm Tuesday 12 August 2014
    Level 3, Catalyst House
    150 Willis Street
    Wellington
    http://wellington.pm.org/

We have Raf lined up to talk about Moose.  If someone else wants to do a
short talk on something else then let me know.

Cheers
Grant



From florent.mara at nzregen.co.nz  Wed Aug  6 14:15:42 2014
From: florent.mara at nzregen.co.nz (Florent Mara)
Date: Thu, 7 Aug 2014 09:15:42 +1200
Subject: [Wellington-pm] Meeting next Tuesday
In-Reply-To: <1407206943.2851.107.camel@putnam.wgtn.cat-it.co.nz>
References: <1407206943.2851.107.camel@putnam.wgtn.cat-it.co.nz>
Message-ID: <CAEoGj=jDGmxk0pGybmtbNZ8oNabNF3dQGphjJnr==aYDSC5ATA@mail.gmail.com>

How awesome! I did not even miss the Moose talk.

See you all next Tuesday.


On Tue, Aug 5, 2014 at 2:49 PM, Grant McLean <grant at mclean.net.nz> wrote:

> Hi Mongers
>
> The August meeting of Wellington Perl Mongers is on next Tuesday.  Usual
> place and time:
>
>     6:00pm Tuesday 12 August 2014
>     Level 3, Catalyst House
>     150 Willis Street
>     Wellington
>     http://wellington.pm.org/
>
> We have Raf lined up to talk about Moose.  If someone else wants to do a
> short talk on something else then let me know.
>
> Cheers
> Grant
>
>
> _______________________________________________
> Wellington-pm mailing list
> Wellington-pm at pm.org
> http://mail.pm.org/mailman/listinfo/wellington-pm
>



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From grant at mclean.net.nz  Mon Aug 11 16:16:45 2014
From: grant at mclean.net.nz (Grant McLean)
Date: Tue, 12 Aug 2014 11:16:45 +1200
Subject: [Wellington-pm] Reminder: meeting this evening
Message-ID: <1407799005.25094.11.camel@putnam.wgtn.cat-it.co.nz>

Hi Mongers

The August meeting of Wellington Perl Mongers is on this evening.  Usual
place and time:

    6:00pm Tuesday 12 August 2014
    Level 3, Catalyst House
    150 Willis Street
    Wellington
    http://wellington.pm.org/

We have Raf lined up to talk about Moose and Olly talking about Perl API
design.

Cheers
Grant


From grant at mclean.net.nz  Tue Aug 12 17:54:58 2014
From: grant at mclean.net.nz (Grant McLean)
Date: Wed, 13 Aug 2014 12:54:58 +1200
Subject: [Wellington-pm] Round-up of last night's meeting
Message-ID: <1407891298.5476.11.camel@putnam.wgtn.cat-it.co.nz>

Hi Mongers

Thank you to Raf and Olly for two interesting talks last night.  I'll
put slides up on the web site if/when I receive them.

Further to Raf's Moose talk, the 'Moose Manual' ships with Moose but is
also available online:

  https://metacpan.org/pod/distribution/Moose/lib/Moose/Manual.pod

Further to Olly's talk/discussion, I referenced the API for the Lucy
search tool which is described here:

  https://metacpan.org/pod/distribution/Lucy/lib/Lucy.pod

There's also documentation for the Lucy::Search::Hits results iterator
class, but it doesn't do much more than provide a ->next() method that
returns either a hashref describing the next document or undef at the
end of the resultset.

The next meeting will be on September the 9th.  Raf has volunteered to
talk about Test::Routine and I'd be delighted to hear from anyone else
who wishes to speak.

Cheers
Grant



From olly at survex.com  Tue Aug 12 18:29:23 2014
From: olly at survex.com (Olly Betts)
Date: Wed, 13 Aug 2014 02:29:23 +0100
Subject: [Wellington-pm] Round-up of last night's meeting
In-Reply-To: <1407891298.5476.11.camel@putnam.wgtn.cat-it.co.nz>
References: <1407891298.5476.11.camel@putnam.wgtn.cat-it.co.nz>
Message-ID: <20140813012920.GZ2487@survex.com>

On Wed, Aug 13, 2014 at 12:54:58PM +1200, Grant McLean wrote:
> Further to Olly's talk/discussion [...]

Thanks for the interesting and useful (to me at least, but I hope others
also benefited) discussion.

Here is some of the iterator stuff I've found on CPAN when looking
before:

Iterator - http://search.cpan.org/dist/Iterator/Iterator.pm

API: value() gives the next entry, throwing an exception if done.
Has is_exhausted() and isnt_exhausted() to check for the end.

| This module is meant to be the definitive implementation of iterators,
| as popularized by Mark Jason Dominus's lectures and recent book (Higher
| Order Perl, Morgan Kauffman, 2005).

It's not been updated since 2005, which makes me wonder if it's actually
used much - even for a simple module you'd think there would have been
a bug report or documentation enhancement in close to 9 years.

Array::Iterator - http://search.cpan.org/dist/Array-Iterator/lib/Array/Iterator.pm

API: next() gives the next entry, throwing an exception if done, or
get_next() if you want undef if done.  Has has_next() to check for the
end.

Iterator::Simple - http://search.cpan.org/dist/Iterator-Simple/lib/Iterator/Simple.pm

API: next() (or <$it> or $it->()) gives the next entry or undef if done.

I've not looked up the various pointers people gave last night, but
based on the discussion last night, Iterator::Simple's API seems like a
good model (and I'd never want to return undef as a value).

Allowing <$it> to work is perhaps a nice touch, since you can then take
advantage of the special handling of <> in while, so this won't give up
if the iterator returns 0 or "0" (though I think all Xapian's iterators
would actually return an object):

    while (my $x = <$it>) {
        process($x);
    }

Rather than having to write:

    while (defined(my $x = $it->next())) {
        process($x);
    }

And based only on the name, I think it's the one Grant would favour.

Cheers,
    Olly

From grant at mclean.net.nz  Thu Aug 14 18:02:40 2014
From: grant at mclean.net.nz (Grant McLean)
Date: Fri, 15 Aug 2014 13:02:40 +1200
Subject: [Wellington-pm] Round-up of last night's meeting
In-Reply-To: <20140813012920.GZ2487@survex.com>
References: <1407891298.5476.11.camel@putnam.wgtn.cat-it.co.nz>
	<20140813012920.GZ2487@survex.com>
Message-ID: <1408064560.5476.50.camel@putnam.wgtn.cat-it.co.nz>

Hmm, just closed a window and found this half-written email hiding
behind it ...

On Wed, 2014-08-13 at 02:29 +0100, Olly Betts wrote:
> Here is some of the iterator stuff I've found on CPAN when looking
> before:
> 
> Iterator - http://search.cpan.org/dist/Iterator/Iterator.pm
> 
> API: value() gives the next entry, throwing an exception if done.
> Has is_exhausted() and isnt_exhausted() to check for the end.

I'm really not a fan of throwing an exception "if done" - doesn't seem
very Perlish.  Reaching the end of the end of the result set seems like
a boundary condition rather than an exception.  Trying to read *past*
the end of a result set might be worthy of an exception.

> Array::Iterator - http://search.cpan.org/dist/Array-Iterator/lib/Array/Iterator.pm
> 
> API: next() gives the next entry, throwing an exception if done, or
> get_next() if you want undef if done.  Has has_next() to check for the
> end.

I guess at least that give the user the choice of avoiding exceptions.

> Iterator::Simple - http://search.cpan.org/dist/Iterator-Simple/lib/Iterator/Simple.pm
> 
> API: next() (or <$it> or $it->()) gives the next entry or undef if done.

That's starting to look more like Perl :-)

> And based only on the name, I think it's the one Grant would favour.

Hard to fault that logic.

Cheers
Grant