Method::Signatures::Modifiers - use Method::Signatures from within MooseX::Declare
use MooseX::Declare; use Method::Signatures::Modifiers; class Foo { method bar (Int $thing) { # this method is declared with Method::Signatures instead of MooseX::Method::Signatures } } # -- OR -- use MooseX::Declare; class My::Declare extends MooseX::Declare { use Method::Signatures::Modifiers; } # ... later ... use My::Declare; class Fizz { method baz (Int $thing) { # this method also declared with Method::Signatures instead of MooseX::Method::Signatures } }
Allows you to use Method::Signatures from within MooseX::Declare, both for the method keyword and also for any method modifiers (before, after, around, override, and augment). Typically method signatures within MooseX::Declare are provided by MooseX::Method::Signatures. Using Method::Signatures instead provides several advantages:
method
before
after
around
override
augment
MooseX::Method::Signatures has a known bug with Perl 5.12.x which does not plague Method::Signatures.
Method::Signatures may provide substantially better performance when calling methods, depending on your circumstances.
Method::Signatures error messages are somewhat easier to read (and can be overridden more easily).
However, Method::Signatures cannot be considered a drop-in replacement for MooseX::Method::Signatures. Specifically, the following features of MooseX::Method::Signatures are not available to you (or work differently) if you substitute Method::Signatures:
MooseX::Method::Signatures allows code such as this:
method foo (ClassName $class: Int $bar) { }
Method::Signatures does not allow you to specify a type for the invocant, so your code would change to:
method foo ($class: Int $bar) { }
MooseX::Method::Signatures allows code like this:
# call this as $obj->foo(bar => $baz) method foo (Int :bar($baz)) { }
This feature is not currently planned for Method::Signatures.
method foo (Int $bar, $, Int $baz) { # second parameter not available as a variable here }
Note that, if the parameter you want to ignore is at the end:
method foo (Int $bar, Int $baz, $) { # third parameter not available as a variable here }
then you could write that in Method::Signatures using the "yada yada" pseudo-parameter:
method foo (Int $bar, Int $baz, ...) { # third (or greater) parameter(s) not available here }
In MooseX::Method::Signatures, does is a synonym for is. Method::Signatures does not honor this.
does
is
Method::Signatures supports several traits that MooseX::Method::Signatures does not.
MooseX::Method::Signatures supports the coerce trait. Method::Signatures does not currently support this, although it is a planned feature for a future release, potentially using the does coerce syntax.
coerce
does coerce
Note that although this module causes all calls to MooseX::Method::Signatures from within MooseX::Declare to be completely replaced by calls to Method::Signatures (or calls to Method::Signatures::Modifiers), MooseX::Method::Signatures is still loaded by MooseX::Declare. It's just never used.
The compile_at_BEGIN flag to Method::Signatures is ignored by Method::Signatures::Modifiers. This is because parsing at compile-time can cause method modifiers to be added before the methods they are modifying are composed into the Moose classes. Parsing of methods at run-time is compatible with MooseX::Method::Signatures.
compile_at_BEGIN
This code was written by Buddy Burden (barefootcoder).
The import code for replacing MooseX::Method::Signatures is based on a suggestion from Nick Perez.
Copyright 2011 by Michael G Schwern <schwern@pobox.com>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See http://www.perl.com/perl/misc/Artistic.html
MooseX::Declare, Method::Signatures, MooseX::Method::Signatures.
To install Method::Signatures, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Method::Signatures
CPAN shell
perl -MCPAN -e shell install Method::Signatures
For more information on module installation, please visit the detailed CPAN module installation guide.