RE: [Q] omissible method declaration in interface file

Subject: RE: [Q] omissible method declaration in interface file
From: JongAm Park <email@hidden>
Date: Sat, 27 May 2006 12:33:43 -0700
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Thank you for your detailed explanation.

Well... isn't it be controlled by @private, @protected, and @public?
No. @private, @protected, and @public apply only to instance variables and not instance methods. As a practical matter, @private, @protected, and @public cannot be enforced even for instance variables at run-time because an instance can always be treated as a C struct via @defs(class_name) and the variables can be accessed using simple C structure dereference.

Hmm.. I am sorry that I was confused it with those for C++. :) I read Apple's Obj-C reference manual again, and finally "recognized" that they are applied only to variables. How did I missed it!!!

If things are omitted in interface files and they
are written in their implementation files, it would be easy to lose
track, and although some methods are deleted accidently from the
implementation file, it would be easier to figure out which one is
omitted or not.
By default, an Objective-C compiler will WARN you that a method is declared but not implemented. Implementing a method that is not declared is not even worth a warning. It is normal.

Yes. Why not. However, let's assume that someone give you his code, i.e. a header and its implementation file. Let's also assume that you use C++. He tried cleaning some portion of code before giving it to you. However, he deleted some 1 or 2 line of functions from his implementation file accidently, but not from his header file which contains a class whose methods are implemented in the implementation file. With C++, it is possible that the compiler emits error message for you.

However if a method declaration in a header file can be omissible, it may not be able to throw errors, because to the compiler, the method doesn't exist at all.

So, this is the reason behind my question.

Thank you.

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JongAm Park                   Home : http://my.dreamwiz.com/jongam
                              Blog : http://jongampark.blogspot.com
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