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What is the equivalent of a C++ pure-virtual function in Objective-C?

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What is the equivalent of a C++ pure-virtual function in Objective-C?

Subject: What is the equivalent of a C++ pure-virtual function in Objective-C?
From: "Michael A. Crawford" <email@hidden>
Date: Sun, 11 Jan 2009 18:20:50 -0800

I want to force derived classes to implement a given interface without provided a default implementation. Does the concept exist in Objective-C (I'm almost sure it does)? If so, what does the syntax look like?

-Michael
----------------------
The united stand.  The divided get played.

-- Bernie MAC

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