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package VarGuard; |
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66785
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use 5.006; |
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use strict; |
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use warnings; |
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=head1 NAME |
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VarGuard - safe clean blocks for variables |
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=head1 VERSION |
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Version 0.03 |
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=cut |
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our $VERSION = '0.03'; |
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=head1 SYNOPSIS |
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use VarGuard; |
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{ |
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var_guard { print "$_[0]\n" } my $scalar; |
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$scalar = 'abc'; |
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} # print "abc\n"; when scalar is destroyed |
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{ |
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var_guard { print "@_\n" } my @array; |
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... |
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} |
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{ |
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var_guard { print "@_\n" } my %hash; |
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... |
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} |
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{ |
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var_guard { $_[0]() } my $code; |
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$code = sub { ... }; |
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... |
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} |
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=head1 DESCRIPTION |
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This module is similar to L, except that this module is guard on a variable. |
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=head1 CAVEAT |
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This module will tie something on the variable. So don't use it on a tied variable, |
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or tie the guarded variable. |
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=head1 EXPORT |
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var_guard |
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=head1 SUBROUTINES |
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=head2 var_guard { ...code block... } VAR(could be $, @, %, or any reference) |
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=cut |
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use base qw(Exporter); |
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135
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our @EXPORT = qw(var_guard); |
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use VarGuard::Scalar; |
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694
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use VarGuard::Array; |
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659
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use VarGuard::Hash; |
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sub var_guard(&\[$@%*]) { |
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my($cb, $var) = @_; |
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my $ref_type = ref $var; |
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if( $ref_type eq 'SCALAR' or $ref_type eq 'CODE' ) { |
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tie $$var, 'VarGuard::Scalar', $cb; |
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} |
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elsif( $ref_type eq 'ARRAY' ) { |
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tie @$var, 'VarGuard::Array', $cb; |
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} |
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elsif( $ref_type eq 'HASH' ) { |
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tie %$var, 'VarGuard::Hash', $cb; |
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} |
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else { |
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die "type: $ref_type is not supported."; |
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} |
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} |
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=head1 AUTHOR |
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90
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Cindy Wang (CindyLinz) |
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=head1 BUGS |
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Please report any bugs or feature requests to C, or through |
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the web interface at L. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 LICENSE AND COPYRIGHT |
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Copyright 2011 Cindy Wang (CindyLinz). |
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This program is free software; you can redistribute it and/or modify it |
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under the terms of either: the GNU General Public License as published |
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by the Free Software Foundation; or the Artistic License. |
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See http://dev.perl.org/licenses/ for more information. |
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108
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=head1 SEE ALSO |
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110
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L |
111
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112
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=cut |
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1; # End of VarGuard |