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.\" ========================================================================
.\"
.IX Title "Devel::BeginLift 3pm"
.TH Devel::BeginLift 3pm "2012-04-21" "perl v5.22.1" "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"
Devel::BeginLift \- make selected sub calls evaluate at compile time
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Devel::BeginLift qw(foo baz);
\&  
\&  use vars qw($i);
\&  
\&  BEGIN { $i = 0 }
\&  
\&  sub foo { "foo: $_[0]\en"; }
\&  
\&  sub bar { "bar: $_[0]\en"; }
\&  
\&  for (1 .. 3) {
\&    print foo($i++);
\&    print bar($i++);
\&  }
\&  
\&  no Devel::BeginLift;
\&  
\&  print foo($i++);
.Ve
.PP
outputs \-
.PP
foo: 0
bar: 1
foo: 0
bar: 2
foo: 0
bar: 3
foo: 4
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Devel::BeginLift 'lifts' arbitrary sub calls to running at compile time
\&\- sort of a souped up version of \*(L"use constant\*(R". It does this via some
slightly insane perlguts magic.
.SS "import"
.IX Subsection "import"
.Vb 1
\&  use Devel::BeginLift qw(list of subs);
.Ve
.PP
Calls Devel::BeginLift\->setup_for(_\|_PACKAGE_\|_ => \e@list_of_subs);
.SS "unimport"
.IX Subsection "unimport"
.Vb 1
\&  no Devel::BeginLift;
.Ve
.PP
Calls Devel::BeginLift\->teardown_for(_\|_PACKAGE_\|_);
.SS "setup_for"
.IX Subsection "setup_for"
.Vb 1
\&  Devel::BeginLift\->setup_for($package => \e@subnames);
.Ve
.PP
Installs begin lifting magic (unless already installed) and registers
\&\*(L"${package}::$name\*(R" for each member of \f(CW@subnames\fR to be executed when parsed
and replaced with its output rather than left for runtime.
.SS "teardown_for"
.IX Subsection "teardown_for"
.Vb 1
\&  Devel::BeginLift\->teardown_for($package);
.Ve
.PP
Deregisters all subs currently registered for \f(CW$package\fR and uninstalls begin
lifting magic is number of teardown_for calls matches number of setup_for
calls.
.SS "setup_for_cv"
.IX Subsection "setup_for_cv"
.Vb 1
\&  $id = Devel::BeginLift\->setup_for_cv(\e&code);
.Ve
.PP
Same as \f(CW\*(C`setup_for\*(C'\fR, but only registers begin lifting magic for one code
reference. Returns an id to be used in \f(CW\*(C`teardown_for_cv\*(C'\fR.
.SS "teardown_for_cv"
.IX Subsection "teardown_for_cv"
.Vb 1
\&  Devel::BeginLift\->teardown_for_cv($id);
.Ve
.PP
Deregisters begin lifting magic referred to by \f(CW$id\fR.
.SH "AUTHOR"
.IX Header "AUTHOR"
Matt S Trout \- <mst@shadowcatsystems.co.uk>
.PP
Company: http://www.shadowcatsystems.co.uk/
Blog: http://chainsawblues.vox.com/
.SH "LICENSE"
.IX Header "LICENSE"
This library is free software under the same terms as perl itself