NAME
Devel::BeginLift - make selected sub calls evaluate at compile time
SYNOPSIS
use Devel::BeginLift qw(foo baz);
use vars qw($i);
BEGIN { $i = 0 }
sub foo { "foo: $_[0]\n"; }
sub bar { "bar: $_[0]\n"; }
for (1 .. 3) {
print foo($i++);
print bar($i++);
}
no Devel::BeginLift;
print foo($i++);outputs -
foo: 0 bar: 1 foo: 0 bar: 2 foo: 0 bar: 3 foo: 4
DESCRIPTION
Devel::BeginLift 'lifts' arbitrary sub calls to running at compile time - sort of a souped up version of "use constant". It does this via some slightly insane perlguts magic.
import
use Devel::BeginLift qw(list of subs);Calls Devel::BeginLift->setup_for(__PACKAGE__ => \@list_of_subs);
unimport
no Devel::BeginLift;Calls Devel::BeginLift->teardown_for(__PACKAGE__);
setup_for
Devel::BeginLift->setup_for($package => \@subnames);Installs begin lifting magic (unless already installed) and registers "${package}::$name" for each member of @subnames to be executed when parsed and replaced with its output rather than left for runtime.
teardown_for
Devel::BeginLift->teardown_for($package);Deregisters all subs currently registered for $package and uninstalls begin lifting magic is number of teardown_for calls matches number of setup_for calls.
setup_for_cv
$id = Devel::BeginLift->setup_for_cv(\&code);Same as setup_for, but only registers begin lifting magic for one code reference. Returns an id to be used in teardown_for_cv.
teardown_for_cv
Devel::BeginLift->teardown_for_cv($id);Deregisters begin lifting magic referred to by $id.
AUTHOR
Matt S Trout - <mst@shadowcatsystems.co.uk>
Company: http://www.shadowcatsystems.co.uk/ Blog: http://chainsawblues.vox.com/
LICENSE
This library is free software under the same terms as perl itself