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

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

Subject: Re: What is the equivalent of a C++ pure-virtual function in Objective-C?
From: Graham Cox <email@hidden>
Date: Mon, 12 Jan 2009 20:34:13 +1100


On 12 Jan 2009, at 7:33 pm, Jean-Daniel Dupas wrote:

Just for the record. Mac OS 10.5 introduced two new keywords to define methods in a protocol:
@required
@optional.
A class that "conforms to" the formal protocol is required to implement the methods marked as required of the protocol.

Yes, but if you don't specify anything, @required is assumed.

--Graham
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References:  
  >What is the equivalent of a C++ pure-virtual function in	Objective-C? (From: "Michael A. Crawford" <email@hidden>)
  >Re: What is the equivalent of a C++ pure-virtual function in	Objective-C? (From: Graham Cox <email@hidden>)
  >Re: What is the equivalent of a C++ pure-virtual function in	Objective-C? (From: Jean-Daniel Dupas <email@hidden>)




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