Tie::Cycle is a simple module that implements cyclic arrays through a tied reference (to the array):
use strict;
use warnings;
use Tie::Cycle;
my @names = qw/tom harry diana nick sally henry/;
tie my $cycle, 'Tie::Cycle', [
sub{print "$_[0] plays\n"},
sub{print "$_[0] eats\n"},
sub{print "$_[0] sleeps\n"}
];
$cycle && $cycle->($_) for (@names);
Prints:
tom plays
harry eats
diana sleeps
nick plays
sally eats
henry sleeps
The last line ($cycle && $cycle->($_) for (@names);) seems a bit odd, but $cycle->($_) doesn't trigger the FETCH sub in the tied scalar (anybody knows why?) and a first call to $cycle is needed.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|