[petsc-users] Fortran Interface NULL object / Casting

[Nicholas Arnold-Medabalimi]

Hi Petsc Users

I am trying to use DMAddField in a Fortran code. I had some questions on
casting/passing NULL. I follow how to pass NULL for standard types (INT,
CHAR, etc).

Is there a method/best practice for passing NULL for Petsc type arguments?
(In this case DMAddLabel I'd want to pass NULL to a DMLabel Parameter not
an intrinsic type)

For the 2nd question, In some cases in C we would cast a more specific
object to Petsc Object
DMAddField(dm, NULL, (PetscObject)fvm); (where fvm is a PetscFVM type)
Is there a method or practice to do the same in Fortran.

Thanks
Nicholas

-- 
Nicholas Arnold-Medabalimi

Ph.D. Candidate
Computational Aeroscience Lab
University of Michigan
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