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In article <AB2c2qg402@terem.perm.su> kaf@terem.perm.su (Kostarev A.) writes:
> Hi Guys:
> 
> In "[FAQ] A Simple Sample Objective-C Programm" (Bill Shirley)
> we have found several unknown
> construction : @interface, @implementation etc..
> We have read "Object-Oriented Programming" An Evolutionary Approach
> (August 1986), but can't find this constructions.
> 
> Can somebody say what means these keywords and where can we
> find full formal descriptions of additional possibilities.
> 
> --------
> Alexey F. Kostarev
> Igor N. Avtaev

Sorry, I've never read "Object-Oriented Programming", so I'm not sure if it 
covers Objective-C -- which is a distinct language from C++, although both 
are based on C.

Constructions beginning with `@' are Objective-C compiler directives.

@interface ThisClass : ThatClass
	means that the following statements (until a @end) declare instance 
variables and methods for a class named ThisClass, which is a subclass of
ThatClass.

@interface ThisClass
	means that the following statements (until a @end) define the methods
that ThisClass responds to.

An excellent introduction to Objective-C can be found in _NeXTSTEP_Concepts_,
by the staff of NeXT Computer, Inc.  In the United States it is published by 
Addison-Wesley.  I don't know if it is available in the CIS, although I've 
heard NeXT sells machines in Russia.

Perhaps someone can suggest a more widely available (and less machine-specific)
reference.  Anybody?

--
Frank Mitchell,	Business Systems Analyst, First National Bank of Chicago
email:frank@fnbc.com (NeXTmail)

"In a way, staring into a computer screen is like staring into an eclipse. 
It's brilliant and you don't realize the damage until its too late."
-- Bruce Sterling, LA Times, 2/20/92