[petsc-dev] MatCreateVecs from Fortran problem

[Victor Eijkhout]

On , 2020Mar17, at 13:15, Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>> wrote:

Is the PETSc model that you don't inialized PETSc object to NULL because you check that pointers are valid PETSc pointers instead of testing on NULL?

I think petsc has switched to the mpi/f08 model where objects are no longer opaque pointers hiding in INTEGERs, but actual Fortran derived Type objects.

At least in MPI these days MPI_COMM_NULL is not a constant but a Type(MPI_Comm) variable.

Victor.

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