Re: OBJ-C question
Re: OBJ-C question
- Subject: Re: OBJ-C question
- From: Ondra Cada <email@hidden>
- Date: Sat, 17 Apr 2004 19:59:55 +0200
Sherm,
On 17.4.2004, at 19:37, Sherm Pendley wrote:
>
I'm confused - your advice is seemingly contradictory to Apple's
>
practice. Looking at AppKit headers such as NSWindow.h,
>
NSOutlineView.h, and NSBrowserView.h, I see all of the delegate and/or
>
data source methods that are relevant to each class added to NSObject
>
as a category.
NO! Those are exactly the informal protocols we are speaking of;
there's no underlying implementation.
There's no thing like an "informal protocol" in the ObjC language. We
call that a category declaration which does not have any
implementation. That's all: the "informal protocol" does nothing less
and nothing more than informing the compiler that some messages exist
and that they have some signatures.
The important point: from the runtime POV, no informal protocol exist
at all.
---
Ondra Hada
OCSoftware: email@hidden
http://www.ocs.cz
private email@hidden
http://www.ocs.cz/oc
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