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advent2009-day22.t
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advent2009-day22.t
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# http://perl6advent.wordpress.com/2009/12/22/day-22-operator-overloading/
use v6;
use Test;
plan 4;
multi sub postfix:<!>(Int $n) {
[*] 1..$n;
}
is 3!, 6, 'factorial operator';
class PieceOfString {
has $.length;
}
## This example seems odd. Why is it passing 2 args to :length in the .new call?
multi sub infix:<+>(PieceOfString $lhs, PieceOfString $rhs) {
PieceOfString.new(:length($lhs.length, $rhs.length));
}
my $a = PieceOfString.new(:length(4));
my $b = PieceOfString.new(:length(6));
my $c = $a + $b;
is $c.length, (4,6), "+ override";
multi sub infix:<==>(PieceOfString $lhs, PieceOfString $rhs --> Bool) {
$lhs.length == $rhs.length;
}
my $d = PieceOfString.new(:length(6));
#?niecza skip 'No candidates for dispatch to &infix:<==>'
ok $b == $d, "override equality";
# XXX This pragma was NOT used in the advent calendar.
use MONKEY_TYPING;
augment class PieceOfString {
method Str {
'-' x $.length;
}
}
is ~$d, '------', 'Str override';
done;