🚀 go-pugleaf

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

In article <1992Oct7.181415.3185@fnbc.com>, frank@fnbc.com (Frank
Mitchell) writes:
|> In article <AB2c2qg402@terem.perm.su> kaf@terem.perm.su (Kostarev A.)
writes:
||> > 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.
||> 
|> 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.

The book mentioned is the original presentation of Objective-C by Brad Cox.
The language syntax used in that early book is slightly different than that
which is currently used.  A new version of the book has been published, which
is much improved:

Object-Oriented Programming: An Evolutionary Approach
	Brad J. Cox and Andrew J. Novobilski
	Addison-Wesley, 1991.
	ISBN 0-201-54834-8

I would be careful about reading Next manuals unless you are actually going
to be programming on a Next machine.  The Next version of the language is
non-standard, and won't necessarily be compatible with compilers produced
for other platforms by Stepstone and others.

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

How about "Objective-C Object-Orientated Programming Techniques" 
by Lewis J. Pinson and Richard S. Wiener, published by 
Addison-Wesley 1991 ISBN 0-201-50828-1.

It compares the Stepstone and NeXT implementations of Objective C 
and gives lots of example code. Class libraries from each are 
covered.

Hope that this is useful.

Guy Roberts, Infotec SA. guy@infotec.ch.
-- 
Guy Roberts(guy@infotec.ch) Infotec S.A.
phone: 022/738 44 33        8 avenue de Frontenex
fax:   022/786 50 61        Geneva, Switzerland.