Re: Is "static" meaningful in Objective-C methods?

[Russell Standish]

Let me butt in: It seems that the solution to Paul's problem to define
a sim. anneal class, and to store the relevant instance variables
there. Then messages pass to the enclosing class can be forwarded onto
the sim. anneal class.

Paul E Johnson wrote:
> 
> "Marcus G. Daniels" wrote:
> > 
> > >>>>> "PJ" == Paul E Johnson <address@hidden> writes:
> > PJ> Using this in Swarm would let me get rid of a bunch of IVARS that hold
> > PJ> values of seldom-used methods, so I could clean up some code.
> > 
> > It seems fishy that an instance variable would ever be changed to static
> > state, since one is local to an object and the other modifies the
> > behavior of any object that calls the method.
> 
> OK, I don't want instances to share the static variable, so I won't do
> it. 
> 
> So you don't think I'm totally insane, here is why I wanted do do this.
> I was looking at using simulated annealing to optimize something (the
> Gnu Scientific Library code makes it quite clear how this can be done,
> incidentally).  In the method to do the simulated annealing, it uses
> some variables that are adjusted each time the method is called.  For
> example, the T variable ("Temperature")  shrinks T just a bit, say
> T=T/1.1.  T is used in no other methods, so it is not needed as an IVAR,
> except that each time the method is called, of course, it has to know
> its previous value.
> 
> I'm reading a C book that recommends using static locals in place of
> global variables where possible. Too bad Obj-C methods don't allow it.
> 
> -- 
> Paul E. Johnson                       email: address@hidden
> Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
> University of Kansas                  Office: (785) 864-9086
> Lawrence, Kansas 66045                FAX: (785) 864-5700
> 
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