Re^2: what would you like to see in perl5.12? (trees)


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Re^2: what would you like to see in perl5.12? (trees)

by Arunbear (Prior)

on Aug 10, 2008 at 16:31 UTC ( [id://703440]=note: print w/replies, xml )

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in reply to Re: what would you like to see in perl5.12? (trees)
in thread what would you like to see in perl5.12?

I've added seekable and reversible hash iteration to Tree::RB. Here is an example:

use strict;
use warnings;
use feature 'say';
use Tree::RB;

my $tied = tie(my %capital, 'Tree::RB');
%capital = (
    France  => 'Paris',
    England => 'London',
    Hungary => 'Budapest',
    Ireland => 'Dublin',
    Egypt   => 'Cairo',
    Germany => 'Berlin',
);

say 'Countries starting from Germany:';
$tied->hseek('Germany');
while(my ($key, $val) = each %capital) {
    say "key: $key, val: $val";
} 

say "\nCountries in reverse:";
$tied->hseek({-reverse=> 1});
while(my ($key, $val) = each %capital) {
    say "key: $key, val: $val";
}
[download]

Output:

Countries starting from Germany:
key: Germany, val: Berlin
key: Hungary, val: Budapest
key: Ireland, val: Dublin

Countries in reverse:
key: Ireland, val: Dublin
key: Hungary, val: Budapest
key: Germany, val: Berlin
key: France, val: Paris
key: England, val: London
key: Egypt, val: Cairo
[download]