Load Perl's class by package name

load_class.pm

sub load_class {
    my($class, $prefix) = @_;

    if ($prefix) {
        unless ($class =~ s/^\+// || $class =~ /^$prefix/) {
            $class = "$prefix\::$class";
        }
    }

    my $file = $class;
    $file =~ s!::!/!g;
    require "$file.pm"; ## no critic

    return $class;
}