Hello, dear esteemed monks!

I just wrote the following in my module. The idea is as follows: allow user to override default methods by either subclassing, or providing a callback. So a subclass with do_foo method and an instance of base class with on_foo member will behave exactly the same.

However, looking at this again, I suspect it's being overengineered. Should I just provide default do_foo methods in subclass that search for a callback and croak if none found? This will still allow for both ad-hoc overriding and subclassing.

Should I just go with normal OO and leave do_foo() alone?

Guess there's no single correct answer after all, but I'd like to hear your opinions and make up my own.

sub backend_call {
    my $self = shift;
    my $method = shift;

    my $todo = $self->{"on_$method"} || $self->can("do_$method");
    if (!$todo) {
        my $sub = [caller(1)]->[3];
        $sub =~ s/.*:://;
        croak join "", (ref $self || $self),"->",$sub,
            ": no backend found for $method";
    };

    return $todo->($self, @_);
};

[download]

Thank you!

In reply to Implementing methods in a subclass or providing in-place callback: Is it overengineered? by Dallaylaen

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