calling an arbitrary superclass method

[Eric Mahurin]

Anybody know of a way to call an arbitrary method in the
superclass? In the current method, you can use "super" to call
the same method of the superclass, but how do you call another?
The only way I can think of off hand is to alias the
superclass methods to something else before creating the
derived class definition. But, that seems kind of ugly. It
seems like there should be a way to call it directly using
superclass or something.




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[Logan Capaldo]

Anybody know of a way to call an arbitrary method in the
superclass? In the current method, you can use "super" to call
the same method of the superclass, but how do you call another?
The only way I can think of off hand is to alias the
superclass methods to something else before creating the
derived class definition. But, that seems kind of ugly. It
seems like there should be a way to call it directly using
superclass or something.





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self.class.superclass.instance_methodsome_method).bind(self).call
(*args)

 

[Eric Mahurin]

On Jul 3, 2005, at 3:31 PM, Eric Mahurin wrote:
=20

self.class.superclass.
instance_methodsome_method).bind(self).call(*args)

That is the magic I was looking for. Thanks.

I think it would be nice if we had something like this in
Object to make it easier (and faster when written in C):

class Object
def super_method(sym)
self.class.superclass.instance_method(sym)
end
def super_send(sym,*args)
super_method(sym).call(*args)
end
end




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[Eric Mahurin]

=20
That is the magic I was looking for. Thanks.
=20
I think it would be nice if we had something like this in
Object to make it easier (and faster when written in C):
=20
class Object
def super_method(sym)
self.class.superclass.instance_method(sym).bind(self)
end
def super_send(sym,*args)
super_method(sym).call(*args)
end
end

Forgot the bind(self). Added it above.


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[redentis]

That is the magic I was looking for. Thanks.

I think it would be nice if we had something like this in
Object to make it easier (and faster when written in C):

class Object
def super_method(sym)
self.class.superclass.instance_method(sym)
end
def super_send(sym,*args)
super_method(sym).call(*args)
end
end

What scenario(s) do you think this would be useful in? Surely the whole
point of the OO principles of polymorphism and implementation hiding is
that you should never need to "call an arbitrary method in the
superclass".

The only case I can think of where you might want to access the
superclass implementation is in an overriding method in a subclass and
at that point 'super' does what you'd expect: gives you essentially
privileged access to the implementation in the super class.

 

[Eric Mahurin]

=20
What scenario(s) do you think this would be useful in? Surely
the whole
point of the OO principles of polymorphism and implementation
hiding is
that you should never need to "call an arbitrary method in
the
superclass".
=20
The only case I can think of where you might want to access
the
superclass implementation is in an overriding method in a
subclass and
at that point 'super' does what you'd expect: gives you
essentially
privileged access to the implementation in the super class.

That is exactly what I want to do. I want to be able to call
more than just the superclass method of the same name that
"super" allows me to.

These methods should be "protected" so that only derived
classes are using them.



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