>You could also implement a "late-bound" visitor using a registry of
>type-to-processor-method mappings. Using such a registry, you could
>run the following code:
> public void RegisterProcessor<T>(Processor<T> processor) {
> processors.Add(typeof(T), delegate(object o) {
> processor((T)o);
> });
> }
Nice! It solves the "big method" and I can only see one cast operation:
processor((T)o);
I tried something very similar but had problems with how to declare the
delegate but this method with the anonymous delegate method solves it.
One problem I see is if there are missing type-processor mappings, but
that's easily fixed:
public class ProcessorRegistry {
...
public void Process(object o) {
Type t = o.GetType();
if (processor.ContainsKey(t))
processors[t](o);
else
// throw exception, call a default processor or do nothing
}
}
// Kristofer
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