[petsc-dev] Counting Fortran function pointers

[Jed Brown]

On Wed, Dec 5, 2012 at 6:03 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>  I think you mean that DMDASNESSetFunctionLocal() sets a function pointer
> specific to DMSNES_DA (I don't think you mean to talk about plain "DM" here
> (yes I use the wrong object for a fortran function pointer recently but
> that was because I was lazy).
>
>     Anyways, the cure is that each PetscObject has two fortran pointer
> arrays; the current one that handles the methods for the base class of the
> PetscObject (for example DMSNESSetFunction()) and the other specific for
> the subclass (for example DMDASNESSetFunctionLocal()). When a subclass gets
> changed with XXXSetType() the second fortran pointer array is deleted so
> you don't get "left over" wrong function pointers. Each subclass manages
> its own enums for the subclass so the base class fortran stuff doesn't need
> to know about the subclasses.
>
>    Does that work?
>

What about derived classes? Must we have the subtype create set the number
of required Fortran pointers?
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