NAME

Method::Signatures::Modifiers - use Method::Signatures from within MooseX::Declare

SYNOPSIS

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
    }
}

DESCRIPTION

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:

• 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:

Types for Invocants

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) {
}

"where" Constraints

MooseX::Method::Signatures allows code like this:

# only allow even integers
method foo (Int $bar where { $_ % 2 == 0 }) {
}

Method::Signatures does not currently allow this, although it is a planned feature for a future release.

Parameter Aliasing (Labels)

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.

Placeholders

MooseX::Method::Signatures allows code like this:

method foo (Int $bar, $, Int $baz)) {
    # second parameter not available as a variable here
}

This feature is not currently planned for Method::Signatures.

Traits

In MooseX::Method::Signatures, does is a synonym for is. Method::Signatures does not honor this.

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.

BUGS, CAVEATS and NOTES

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.

THANKS

This code was written by Buddy Burden (barefootcoder).

The import code for replacing MooseX::Method::Signatures is based on a suggestion from Nick Perez.

LICENSE

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

SEE ALSO

MooseX::Declare, Method::Signatures, MooseX::Method::Signatures.