use strict;
use warnings;
use Data::Dump qw/pp dd/;
use Test::More;


sub matrix2 (&@){
    my $code = shift;

    my @coor;
    my $depth = @_;

    my $rec;
    $rec = sub  {

        return $code->(@coor) unless @_;

        my $level  = $depth - @_;
        my $max    = shift;
        my $cursor = \$coor[$level];

        my $arr = [
                   map {
                       $$cursor = $_;
                       $rec->(@_)
                   } 0 .. $max
                  ];

        return $arr;
    };

    $rec->(@_);
}



my $a_matrix = matrix2 {"<@_>"} 3,2,1;



my @classic;
for my $x (0..3) {
    for my $y (0..2) {
        for my $z (0..1) {
            $classic[$x][$y][$z] = "<$x $y $z>";
        }
    }
}




is_deeply($a_matrix,\@classic,"same matrix");

pp \@classic;

done_testing;