PetscObjectExists

Determines whether a PETSc object has been destroyed.

#include "petsc.h"    
int PetscObjectExists(PetscObject obj,PetscTruth *exists)

Not Collective

obj -any PETSc object, for example a Vec, Mat or KSP. Thus must be cast with a (PetscObject), for example, PetscObjectGetCookie((PetscObject)mat,&exists);

exists -PETSC_FALSE if object does not exist; PETSC_TRUE if object does exist.