There is a module called Quantum::Superpositions , among other things it also allows binary functions to receive quantum parameters. We can extend that to an arbitrary number of parameters. This can serve as a replacement for Algorithm::Loops. Basically you pack up the arguments in a structure like:

[a1,[a2,[a3,...[an,an1]]]..]

the nice property is that each time you look at a ai you get a different value :) In fact, the only thing that concerns you as a programmer , is that you will get every possible combination of the parameters once and only once.

use strict;
use warnings;

# 18-01-2010 
# cartesian product for 3 or more sets using Quantum::Superpositions


# works because BINARY in Q::S allows to make quantized functions like
+ U and p.

sub p { return \@_; }

sub U  {
    my $i = $_[1];
    my @element; # an element of the cartesian product

    if(ref($i) eq 'ARRAY') {
        while(1){
            push @element,$i->[0];
            $i=$i->[1];
            last unless ref($i) eq 'ARRAY';
        }
    };

    @element=($_[0],@element,$i);

    print join(' ',@element)."\n"
    if ref($_[1]) eq 'ARRAY';
}

use Quantum::Superpositions 
BINARY         => ['main::U','main::p'];


#U(any(1..2),p(any(9..13),p(any(0..1),p(any(2..4),any(5..8)))));
U(any(1..2),p(any(2..4),any(5..10)));

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In reply to Quantum tuples by spx2

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