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Devel::BeginLift - make selected sub calls evaluate at compile time |
Devel::BeginLift - make selected sub calls evaluate at compile time
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
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.
use Devel::BeginLift qw(list of subs);
Calls Devel::BeginLift->setup_for(__PACKAGE__ => \@list_of_subs);
no Devel::BeginLift;
Calls Devel::BeginLift->teardown_for(__PACKAGE__);
Devel::BeginLift->setup_for($package => \@subnames);
Installs begin lifting magic (unless already installed) and registers ``${package}::$name'' for each member of @subnames to be executed when parsed and replaced with its output rather than left for runtime.
Devel::BeginLift->teardown_for($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.
Matt S Trout - <mst@shadowcatsystems.co.uk>
Company: http://www.shadowcatsystems.co.uk/ Blog: http://chainsawblues.vox.com/
This library is free software under the same terms as perl itself
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Devel::BeginLift - make selected sub calls evaluate at compile time |