In a class I'm coding, I have a method that calls a code ref to process an argument, another to initialize that code ref, and two (e.g.) other methods that handle the processing. Stripped down, the example looks like this: 
                                                           
    sub foo_a {                                                  
        my ($self, $arg) = @_;                                   
        # method A for processing $arg                           
    }                                                            
                                                                 
    sub foo_b {                                                  
        my ($self, $arg) = @_;                                   
        # method B for processing $arg                           
    }                                                            
                                                                 
    sub foo {                                                    
        my ($self, $arg) = @_;                                   
        $self->{'foo_code'}->($self, $arg);     # XXX            
    }                                                            
                                                                 
    sub foo_set {                                                
        my ($self, $code) = @_;                                  
        $self->{'foo_code'} = $code;                             
    }

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The user has access to the specific foo_a() and foo_b() methods, or can use foo() to call whatever's registered as the current underlying method.

The line marked "XXX" above bugs me. Having to simulate an object-call to the underlying method by explicitly repeating $self in the calling sequence feels ugly. Is there a better way that this can be done more "directly?"

I had some success changing foo_set() to fiddle with typeglobs as a way of "aliasing" foo() to the underlying method, but this gets in the way of letting users supply their own processing functions via an anonymous code ref: 
                                                           
    $obj->foo_set(sub { # process $_[1] });

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Is there any magic I'm overlooking that cleans this up?

In reply to cleaning up an indirect by knight

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