Scroll to navigation

LexAlias(3pm) User Contributed Perl Documentation LexAlias(3pm)


Devel::LexAlias - alias lexical variables


 use Devel::LexAlias qw(lexalias);
 sub steal_my_x {
     my $foo = 1;
     lexalias(1, '$x', \$foo);
 sub foo {
     my $x = 22;
     print $x; # prints 22
     print $x; # prints 1


Devel::LexAlias provides the ability to alias a lexical variable in a subroutines scope to one of your choosing.

If you don't know why you'd want to do this, I'd suggest that you skip this module. If you think you have a use for it, I'd insist on it.

Still here?

$where refers to the subroutine in which to alias the lexical, it can be a coderef or a call level such that you'd give to "caller"

$name is the name of the lexical within that subroutine

$variable is a reference to the variable to install at that location


lexalias delves into the internals of the interpreter to perform its actions and is so very sensitive to bad data, which will likely result in flaming death, or a core dump. Consider this a warning.

There is no checking that you are attaching a suitable variable back into the pad as implied by the name of the variable, so it is possible to do the following:

 lexalias( $sub, '$foo', [qw(an array)] );

The behaviour of this is untested, I imagine badness is very close on the horizon though.


peek_sub from PadWalker, Devel::Peek


Richard Clamp <> with close reference to PadWalker by Robin Houston


Copyright (c) 2002, 2013, Richard Clamp. All Rights Reserved. This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself.

2022-07-30 perl v5.34.0