Hello,
2014-12-17 17:34 GMT+01:00 David Chisnall <[email protected]>:
>
> On 17 Dec 2014, at 17:23, Johan Ceuppens <[email protected]> wrote:
>
> > Hello,
> >
> > I am writing a small prolog system with a decision tree which
> understands "not x" and "x" for now. This can be used in the CALayer as
> said before by Ivan here.
> >
> > The interface is as follows :
> > //make predicates which is an NSString
> > OpalFuzzyPredicate *pred = [[OpalFuzzyPredicate alloc] init];
> > //initialize it with a string which in this case is multi-worded
> > [pred initWithString:@"update full window";
>
> Sending an init-family method to an object that has already been
> initialised is usually undefined behaviour.
>
>
I didn't know. I thought init was part of NSObject.
> > //so it becomes a compound, which gets parsed and
> > //adds comp to compound DB and compiles it into the tree
> > InferenceCompound *comp = [factory makeCompound:pred];
>
> What is factory? In Objective-C classes are usually factories, there's
> little need for the factory pattern in a language where class methods can
> be overridden.
>
The factory pattern makes for a static if you like, it's interface is like :
<code>
@interface OpalFuzzyDTreeFactory
{
OpalFuzzyInference *_inference;
}
- (id) makeDTree;
- (id) makeADT:(OpalFuzzyPredicate*)p with:(Class)adt;
- (id) makeAtom:(OpalFuzzyPredicate*)p;
- (id) makeVar:(OpalFuzzyPredicate*)p;
- (id) makeNumber:(OpalFuzzyPredicate*)p;
- (id) makeCompound:(OpalFuzzyPredicate*)p;
- (id) compileToTree:(InferenceADT*)adt;
//_inference wrapper
- (id)createInferenceManipulator;
@end
</code>
>
> >
> > pred = [[OpalFuzzyPredicate alloc] init];
> > //initialize it with a string which in this case is multi-worded
> > [pred initWithString:@"not update full window";
>
> Once again. And why would you want to do this rather than reuse
> NSPredicate, which can already represent and operate on predicates?
>
>
If it's in Foundation OK then.
> >
> > //so it becomes a compound, which gets parsed and
> > //adds comp to compound DB and compiles it into the tree
> > InferenceCompound *comp = [factory makeCompound:pred];
> >
> > I will try to get this in if I can do it.
>
> Given your unwillingness to fully explain what you're doing and the
> appalling quality of your code (some of the diffs you've posted obviously
> wouldn't even compile due to mismatched braces, the rest is broken due to
> poor understanding of Objective-C conventions), I'd be very hesitant about
> your having commit access to a GNUstep repository until you've demonstrated
> that:
>
> - You can communicate with other developers
> - You can write useable code
>
>
Don't worry, I'll do that off-list :-)
> David
>
> -- Send from my Jacquard Loom
>
>
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