question about foreach, opApply, and delegates

[Jerry Quinn]

downs Wrote:

> Jerry Quinn wrote:
> > Hi, all.  I find myself a little confused about how foreach, opApply, and delegates interact according to the docs.
> > 
> > Foreach on an aggregate will use the opApply call (assuming ranges aren't being used).  So if we use a simple example below, what exactly is the delegate that is passed to opApply? 
> 
> > The docs say a delegate is a pairing of an object reference and a function, where the object is passed as the 'this' parameter to the function.  But that doesn't seem to be the case here.
> 
> If the docs say that, they're wrong.
> 
> Generally speaking, a delegate is a pairing of a function pointer and a context, where the context can be a struct pointer, a class reference *or a stackframe*, as is the case with opApply.
> 
> Hope that clears things up.

Yes, that helps.  All 3 replies are basically the same, and the docs are clearly insufficient to describe what's actually happening in a delegate.

I'll file a bug.

Thanks!