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comp.lang.ruby

declaration for module methods which need to be implemented

Paul

12/13/2007 10:29:00 PM

Let's say I have the following module:

------------------------
module Parenting

def add_child(a_child)
self.children.push(a_child)
end

def delete_child(a_child)
self.children.delete(a_child)
end

def children
# need to implement
but is there a programtaic way to declare this?
end

end
------------------------

Is there a way to enforce that the 'children' method is understood in
any class which includes this module? Or do I simply rely on a
comment, as above
1 Answer

Eivind Eklund

12/14/2007 10:16:00 AM

0

On Dec 13, 2007 11:30 PM, Paul <pdavidow@gmail.com> wrote:
> Let's say I have the following module:
[...]
> Is there a way to enforce that the 'children' method is understood in
> any class which includes this module? Or do I simply rely on a
> comment, as above

There are ways (you can play around with Parenting.inherited and do
method rewrites), yet I suspect you're better off with a comment. All
methods for ensuring this have limitations that will block some cases
of valid code (though that may be resolved by adding a sort of
say-that-it-is-OK method).

Eivind.