sub make_max_finder {
        my $max;
        sub {
            for (@_) { $max = $_ if !defined $max || $_ > $max }
            $max;
        }
    }

##</code><code>##

    my $max_finder = make_max_finder();

##</code><code>##

    $max_finder->(0);
    print $max_finder->();    # 0
    print $max_finder->(-1);  # 0
    print $max_finder->(2);   # 2

##</code><code>##

    print $max_finder->(-1, 3, 0);  # 3
    print $max_finder->(-1, 0, 1);  # 3

##</code><code>##

    my $max_finder = make_max_finder();

    while (my $next_val = get_next_value()) {
        $max_finder->($next_val);
    }

    $max_finder->();  # retrieve maximum

##</code><code>##

    my $max_value = make_max_finder()->(@values);