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 steal_my_x; 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
$where
caller
$name is the name of the lexical within that subroutine
$name
$variable is a reference to the variable to install at that location
$variable
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 <richardc@unixbeard.net> 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.
To install Devel::LexAlias, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Devel::LexAlias
CPAN shell
perl -MCPAN -e shell install Devel::LexAlias
For more information on module installation, please visit the detailed CPAN module installation guide.