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Re: Can a Swarm instance be treated like a SwarmObject instance?
From: |
Ken Cline |
Subject: |
Re: Can a Swarm instance be treated like a SwarmObject instance? |
Date: |
Thu, 22 Apr 1999 13:35:41 -0400 (EDT) |
On Thu, 22 Apr 1999, William S. Shu wrote:
I presume the `createBegin:' fragment below is from the
SmlSwarm.m. If so, why are you assigning the pointer
returned from `[super createBegin: aZone]' (that is,
`[Swarm createBegin: aZone]') to a SmlObject pointer?
(As I recall) By default the ivars for ObjC objects will
have a protected access level and hence the compiler is
correct to warn you about trying to access SmlObject ivars
from a SmlSwarm method.
My apologies if I've mis-interpreted what you are trying to
do.
Ken.
> The code and error messages follow:
>
> The createBegin Method:
>
> + createBegin: aZone
> {
> SmlObject *obj;
>
> obj = [super createBegin: aZone];
>
> // initialise SmlObject to suitable (harmless) defaults
> obj->birthday = 0;
> obj->position.x = 0;
>
> ...
>
> return obj; // return self
> }
>
>
>
> Compilation messages:
>
> cd c:/u/mosq/proto/
> make -k SmlSwarm.o
> gcc -c -Wno-import -g -O2 -fno-inline -I/Apps/Swarm-1.3.1/packages/swarm/in
> clude SmlSwarm.m
> SmlSwarm.m: In function `_c_SmlSwarm__createBegin_':
> SmlSwarm.m:317: instance variable `birthday' is declared protected
> SmlSwarm.m:318: instance variable `position' is declared protected
> SmlSwarm.m:319: instance variable `position' is declared protected
> SmlSwarm.m:320: instance variable `clusterList' is declared private
> SmlSwarm.m:321: instance variable `world' is declared protected
> SmlSwarm.m:322: instance variable `valueSpace' is declared protected
> SmlSwarm.m:323: instance variable `modelSwarm' is declared protected
> SmlSwarm.m:324: instance variable `smlColor' is declared protected
> make: *** [SmlSwarm.o] Error 1
> gcc -c -Wno-import -g -O2 -fno-inline -I/Apps/Swarm-1.3.1/packages/swarm/in
> clude SmlPopSwarm.m
>
> Compilation exited abnormally with code 2 at Thu Apr 22 16:32:27
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