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.\" ========================================================================
.\"
.IX Title "Method::Signatures::Modifiers 3pm"
.TH Method::Signatures::Modifiers 3pm "2018-01-02" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Method::Signatures::Modifiers \- use Method::Signatures from within MooseX::Declare
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    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
\&        }
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Allows you to use Method::Signatures from within
MooseX::Declare, both for the \f(CW\*(C`method\*(C'\fR keyword and also for any
method modifiers (\f(CW\*(C`before\*(C'\fR, \f(CW\*(C`after\*(C'\fR, \f(CW\*(C`around\*(C'\fR, \f(CW\*(C`override\*(C'\fR, and
\&\f(CW\*(C`augment\*(C'\fR).  Typically method signatures within MooseX::Declare
are provided by MooseX::Method::Signatures.  Using
Method::Signatures instead provides several advantages:
.IP "\(bu" 4
MooseX::Method::Signatures has a known bug with Perl 5.12.x
which does not plague Method::Signatures.
.IP "\(bu" 4
Method::Signatures may provide substantially better
performance when calling methods, depending on your circumstances.
.IP "\(bu" 4
Method::Signatures error messages are somewhat easier to
read (and can be overridden more easily).
.PP
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:
.PP
\fITypes for Invocants\fR
.IX Subsection "Types for Invocants"
.PP
MooseX::Method::Signatures allows code such as this:
.PP
.Vb 2
\&    method foo (ClassName $class: Int $bar) {
\&    }
.Ve
.PP
Method::Signatures does not allow you to specify a type for the
invocant, so your code would change to:
.PP
.Vb 2
\&    method foo ($class: Int $bar) {
\&    }
.Ve
.PP
\fIParameter Aliasing (Labels)\fR
.IX Subsection "Parameter Aliasing (Labels)"
.PP
MooseX::Method::Signatures allows code like this:
.PP
.Vb 3
\&    # call this as $obj\->foo(bar => $baz)
\&    method foo (Int :bar($baz)) {
\&    }
.Ve
.PP
This feature is not currently planned for Method::Signatures.
.PP
\fIPlaceholders\fR
.IX Subsection "Placeholders"
.PP
MooseX::Method::Signatures allows code like this:
.PP
.Vb 3
\&    method foo (Int $bar, $, Int $baz) {
\&        # second parameter not available as a variable here
\&    }
.Ve
.PP
This feature is not currently planned for Method::Signatures.
.PP
Note that, if the parameter you want to ignore is at the end:
.PP
.Vb 3
\&    method foo (Int $bar, Int $baz, $) {
\&        # third parameter not available as a variable here
\&    }
.Ve
.PP
then you could write that in Method::Signatures using the \*(L"yada
yada\*(R" pseudo-parameter:
.PP
.Vb 3
\&    method foo (Int $bar, Int $baz, ...) {
\&        # third (or greater) parameter(s) not available here
\&    }
.Ve
.PP
\fITraits\fR
.IX Subsection "Traits"
.PP
In MooseX::Method::Signatures, \f(CW\*(C`does\*(C'\fR is a synonym for \f(CW\*(C`is\*(C'\fR.
Method::Signatures does not honor this.
.PP
Method::Signatures supports several traits that
MooseX::Method::Signatures does not.
.PP
MooseX::Method::Signatures supports the \f(CW\*(C`coerce\*(C'\fR trait.
Method::Signatures does not currently support this, although it is
a planned feature for a future release, potentially using the \f(CW\*(C`does
coerce\*(C'\fR syntax.
.SH "BUGS, CAVEATS and NOTES"
.IX Header "BUGS, CAVEATS and NOTES"
Note that although this module causes all calls to
MooseX::Method::Signatures from within MooseX::Declare to be
completely \fIreplaced\fR by calls to Method::Signatures (or calls to
Method::Signatures::Modifiers), MooseX::Method::Signatures is still
\&\fIloaded\fR by MooseX::Declare.  It's just never used.
.PP
The \f(CW\*(C`compile_at_BEGIN\*(C'\fR 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.
.SH "THANKS"
.IX Header "THANKS"
This code was written by Buddy Burden (barefootcoder).
.PP
The import code for replacing MooseX::Method::Signatures is based
on a suggestion from Nick Perez.
.SH "LICENSE"
.IX Header "LICENSE"
Copyright 2011 by Michael G Schwern <schwern@pobox.com>.
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.PP
See \fIhttp://www.perl.com/perl/misc/Artistic.html\fR
.SH "SEE ALSO"
.IX Header "SEE ALSO"
MooseX::Declare, Method::Signatures, MooseX::Method::Signatures.