NAME

Sub::Exporter::ForMethods - helper routines for using Sub::Exporter to build methods

VERSION

version 0.091970

SYNOPSIS

In an exporting library:

package Method::Builder;

use Sub::Exporter::ForMethods qw(method_installer);

use Sub::Exporter -setup => {
  exports   => [ method => \'_method_generator' ],
  installer => method_installer,
};

sub _method_generator {
  my ($self, $name, $arg, $col) = @_;
  return sub { ... };
};

In an importing library:

package Vehicle::Autobot;
use Method::Builder method => { -as => 'transform' };

DESCRIPTION

The synopsis section, above, looks almost indistinguishable from any other use of Sub::Exporter, apart from the use of method_installer. 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 Vehicle::Autobot::transform. This will insert a named frame into stack traces to aid in debugging.

More importantly (for the author, anyway), they will not be removed by namespace::autoclean. This makes the following code work:

package MyLibrary;

use Math::Trig qw(tan);         # uses Exporter.pm
use String::Truncate qw(trunc); # uses Sub::Exporter's defaults

use Sub::Exporter::ForMethods qw(method_installer);
use Mixin::Linewise { installer => method_installer }, qw(read_file);

use namespace::autoclean;

...

1;

After MyLibrary is compiled, namespace::autoclean will remove tan and trunc as foreign contaminants, but will leave read_file in place. It will also remove method_installer, an added win.

EXPORTS

Sub::Exporter::ForMethods offers only one routine for export, and it may also be called by its full package name:

method_installer

This routine returns an installer suitable for use as the installer argument to Sub::Exporter. It updates the \@to_export argument to wrap all code that will be installed by name in a named subroutine, then passes control to the default Sub::Exporter installer.

AUTHOR

Ricardo Signes <rjbs@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2009 by Ricardo Signes.

This is free software; you can redistribute it and/or modify it under the same terms as perl itself.