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List:       ruby-talk
Subject:    Re: Interfaces in Ruby
From:       "Robert" <bob.news () gmx ! net>
Date:       2003-01-03 10:13:03
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thanks a lot for those remarks and pointers!

kind regards

    robert


"Paul Brannan" <pbrannan@atdesk.com> schrieb im Newsbeitrag
news:20030102160633.GS31857@atdesk.com...
> On Thu, Jan 02, 2003 at 11:49:55PM +0900, Robert wrote:
> > since ruby is dynamically type in principle there is no technical need
for
> > interfaces.  however, if i want to define an interface - say for reasons
of
> > documentation - what is the suggested way to do so?  create a class with
a
> > set of methods returning 'nil' or 'self'?  or create a method, that
checks
> > the interface of an instance and raises a TypeError if any of the
methods is
> > missing?  what would you suggest?
>
> Make sure whatever mechanism you use is a module and not a class.  Ruby
> only has single inheritance, so if it's a class, then I can't get both
> your interface and inherit from another class.
>
> See some discussion on this at (at the bottom under Abstract Base
> Classes):
>
>   http://www.rubygarden.org/ruby?RubyFromCpp
>
> See also an earlier thread on this list starting at [ruby-talk:53297].
>
> Paul
>
>


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