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.\" ========================================================================
.\"
.IX Title "Sub::Exporter::ForMethods 3pm"
.TH Sub::Exporter::ForMethods 3pm "2015-07-17" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Sub::Exporter::ForMethods \- helper routines for using Sub::Exporter to build methods
.SH "VERSION"
.IX Header "VERSION"
version 0.100052
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
In an exporting library:
.PP
.Vb 1
\&  package Method::Builder;
\&
\&  use Sub::Exporter::ForMethods qw(method_installer);
\&
\&  use Sub::Exporter \-setup => {
\&    exports   => [ method => \e\*(Aq_method_generator\*(Aq ],
\&    installer => method_installer,
\&  };
\&
\&  sub _method_generator {
\&    my ($self, $name, $arg, $col) = @_;
\&    return sub { ... };
\&  };
.Ve
.PP
In an importing library:
.PP
.Vb 2
\&  package Vehicle::Autobot;
\&  use Method::Builder method => { \-as => \*(Aqtransform\*(Aq };
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The synopsis section, above, looks almost indistinguishable from any other
use of Sub::Exporter, apart from the use of
\&\f(CW\*(C`method_installer\*(C'\fR.  It is nearly indistinguishable in behavior, too.  The
only change is that subroutines exported from Method::Builder into named slots
in Vehicle::Autobot will be wrapped in a subroutine called
\&\f(CW\*(C`Vehicle::Autobot::transform\*(C'\fR.  This will insert a named frame into stack
traces to aid in debugging.
.PP
More importantly (for the author, anyway), they will not be removed by
namespace::autoclean.  This makes the following code
work:
.PP
.Vb 1
\&  package MyLibrary;
\&
\&  use Math::Trig qw(tan);         # uses Exporter.pm
\&  use String::Truncate qw(trunc); # uses Sub::Exporter\*(Aqs defaults
\&
\&  use Sub::Exporter::ForMethods qw(method_installer);
\&  use Mixin::Linewise { installer => method_installer }, qw(read_file);
\&
\&  use namespace::autoclean;
\&
\&  ...
\&
\&  1;
.Ve
.PP
After MyLibrary is compiled, \f(CW\*(C`namespace::autoclean\*(C'\fR will remove \f(CW\*(C`tan\*(C'\fR and
\&\f(CW\*(C`trunc\*(C'\fR as foreign contaminants, but will leave \f(CW\*(C`read_file\*(C'\fR in place.  It
will also remove \f(CW\*(C`method_installer\*(C'\fR, an added win.
.SH "EXPORTS"
.IX Header "EXPORTS"
Sub::Exporter::ForMethods offers only one routine for export, and it may also
be called by its full package name:
.SS "method_installer"
.IX Subsection "method_installer"
.Vb 1
\&  my $installer = method_installer(\e%arg);
.Ve
.PP
This routine returns an installer suitable for use as the \f(CW\*(C`installer\*(C'\fR argument
to Sub::Exporter.  It updates the \f(CW\*(C`\e@to_export\*(C'\fR argument to wrap all code that
will be installed by name in a named subroutine, then passes control to the
default Sub::Exporter installer.
.PP
The only argument to \f(CW\*(C`method_installer\*(C'\fR is an optional hashref which may
contain a single entry for \f(CW\*(C`rebless\*(C'\fR.  If the value for \f(CW\*(C`rebless\*(C'\fR is true,
when a blessed subroutine is wrapped, the wrapper will be blessed into the same
package.
.SH "AUTHOR"
.IX Header "AUTHOR"
Ricardo Signes <rjbs@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2015 by Ricardo Signes.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.