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Author image Buddy Burden
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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:

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) {

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.


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.

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.

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.


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.


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.