The timing of values in imperative APIs
Option configuration is a classic example of when I prefer a purely functional approach. This post is not about broken semantics, but rather about the tension between ease of implementation and ease of use. Given Perl's imperative heritage, many modules default to imperative option specification. This means that the choice of one behavior over another is represented by an action (setting the optio
Scoping of the current package
The one thing that I almost always notice when playing around in non Perl languages is how well Perl handles scoping. There is one place in which Perl got it totally wrong though. The value of the current package is lexically scoped: package Foo; { package Bar; say __PACKAGE__; # prints Bar } say __PACKAGE__; # prints Foo However, the notion of the current package during compilation is dynamically
<tt>Sub::Call::Recur</tt>
After my last post about Sub::Call::Tail melo and jrockway both asked me whether I was aware of Clojure's recur form. I wasn't. Shortly afterwords I wrote Sub::Call::Recur, which implements that form in Perl. The recur operation is a tail call to the current subroutine. It's a bit like Perl's redo builtin, but for functions instead of blocks. Here is a tail recursive factorial implementation: sub
<tt>Sub::Call::Tail</tt>
I've just released Sub::Call::Tail which allows for a much more natural tail call syntax than Perl's goto built in. It provides a tail keyword that modifies normal invocations to behave like goto &sub, without needing the ugly @_ manipulation. Instead of this horrible kludge: @_ = ( $foo, $bar ); goto &foo; You can now write: tail foo($foo, $bar); And much more importantly this method call emulati
Roles and Delegates and Refactoring
Ovid writes about the distinction between responsibility and behavior, and what that means in the context of roles. He argues that the responsibilities of a class may sometimes lie in tangent with additional behaviors it performs (and that these behaviors are often also in tangent with one another). Since roles lend themselves to more horizontal code reuse (what multiple inheritance tries to allow
IO::Handle::Util
My friend miyagawa has been championing PSGI and its reference implementation, Plack. This is something we've needed for a long time: a clean and simple way to respond to HTTP requests without the cruft of CGI and %ENV. The PSGI specification requires the body of the response to be represented using an object similar to IO::Handle. I've released IO::Handle::Util, a convenience package designed to
Hackathon Summary
During the YAPC::Asia::2009 hackathon I refactored a bunch of XS modules out of some other code, both rafl's and mine. XS::Object::Magic This module provides an alternative to the standard T_PTROBJ approach to creating C struct based objects in Perl. The traditional way creates a blessed scalar reference, which contains an integer value that is cast to a pointer of the right type. This is problema
YAPC::Tiny, YAPC::Asia
I'd like to thank to everyone that made my trip to Asia so great thus far. To list but a few: thanks to the JPA for organizing YAPC::Asia, especially Daisuke for being so accommodating when it wasn't clear if I would make it till the end, gugod for organizing YAPC::Tiny, Kenichi Ishigaki and Kato Atsushi for translating my talks (though only one was presented in the end), clkao and audreyt for bei
Optimizing Moose's Startup
It's well known that while Moose competes well with hand written code at runtime. However, Moose code still needs to pay a lot at compile time, due to the comprehensive extensibility of the metamodel. We've previously made fairly successful attempts to optimize startup but there's always room for improvement. Thankfully Goro Fuji has received sponsorship to optimize Moose's startup time, and even
PL_runops
I'm going to try to do a series of posts about learning Perl internals. I am still a beginner, I have trouble remembering the many macros, or keeping everything in my head all at once, so hopefully I will be able to make some sense of this stuff in a way that is accessible to other beginners. While I'm definitely diving right in to the deep end, I think PL_runops is a good place to start as any, t
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Abstracting Ambiguity