Sub::Exporter::ForMethUser3Contributed Perl DocumeSub::Exporter::ForMethods(3)NAMESub::Exporter::ForMethods - helper routines for using Sub::Exporter to
build methods
VERSION
version 0.100050
SYNOPSIS
In an exporting library:
package Method::Builder;
use Sub::Exporter::ForMethodsqw(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::ForMethodsqw(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.
EXPORTSSub::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) 2010 by Ricardo Signes.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
perl v5.14.1 2010-01-06 Sub::Exporter::ForMethods(3)
