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package Tie::Expression; |
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use warnings; |
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use strict; |
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our $VERSION = sprintf "%d.%02d", q$Revision: 0.1 $ =~ /(\d+)/g; |
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sub TIEHASH($) { bless \eval { my $scalar }, shift } |
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sub FETCH($$) { $_[1] } |
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1; |
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=head1 NAME |
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Tie::Expression - Let any %hash interpolate any expression. |
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=head1 VERSION |
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$Id: Expression.pm,v 0.1 2008/07/01 17:56:27 dankogai Exp dankogai $ |
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=head1 SYNOPSIS |
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use Tie::Expression; |
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tie my %expression, 'Tie::Expression'; |
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print "PI = $expression{ 4 * atan2(1,1) }.\n"; |
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=head1 DISCUSSION |
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This module makes any tied hash a I. Just |
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feed its key any expression and the result of the expression becomes |
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the value. |
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It is known that C< @{[ expression ]} > is a univasal |
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interpolator but the solution with this module is more elegant. |
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The implementation is deceptively simple. Just check the source and |
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you will find this module is just six lines long! |
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=head1 SEE ALSO |
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L |
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=head1 EXPORT |
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Nothing. |
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=head1 AUTHOR |
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Dan Kogai, C<< >> |
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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 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc Tie::Expression |
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You can also look for information at: |
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=over 4 |
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=item * RT: CPAN's request tracker |
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L |
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=item * AnnoCPAN: Annotated CPAN documentation |
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L |
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=item * CPAN Ratings |
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L |
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=item * Search CPAN |
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L |
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=back |
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=head1 ACKNOWLEDGEMENTS |
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None so far. |
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=head1 COPYRIGHT & LICENSE |
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Copyright 2008 Dan Kogai, all rights reserved. |
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |