use strict;
use warnings;

use Test::More;

use Data::Dumper;

my $correct_result = make_a_rowsxcols_array(5,3);
print Dumper($correct_result);

### $#out = -1; # clears an array;

# Case1: pass it an arrayref
my $T = 'Case1';
my @out = (1,2,3);
is( case1(\@out), 0, "$T: returned success.");
is_deeply(\@out, $correct_result, "$T: correct result.");

# Case2: pass it a scalar
$T = 'Case2';
my $x = 123;
is( case2($x), 0, "$T: returned success.");
is_deeply($x, $correct_result, "$T: correct result.");

# Case3: pass it a scalarref
$T = 'Case3';
my $y = 123;
is( case3(\$y), 0, "$T: returned success.");
is_deeply($y, $correct_result, "$T: correct result.");

done_testing();

sub case1 {
	# pass an arrayref, clear it and make it 5rowsx3cols
	my $out = $_[0];
	return 1 unless ref($out) eq 'ARRAY';
	$#{ $out } = -1;
	push @$out, @{ make_a_rowsxcols_array(5,3) };
	return 0;
}

sub case2 {
	# pass a simple scalar, make it an arrayref
	my $out = $_[0];
	return 1 unless ref($out) eq '';

	$out = make_a_rowsxcols_array(5,3);
	return 0;
}

sub case3 {
	# pass a scalarref, fill it with an arrayref to 5rowsx3cols
	my $out = $_[0];
	return 1 unless ref($out) eq 'SCALAR';

	undef $$out;
	$$out = make_a_rowsxcols_array(5,3);
	return 0;
}


sub make_a_rowsxcols_array {
	[ map { [ (42)x$_[1] ] } 1..$_[0] ]
}