#include "petsc/private/petscimpl.h" PetscErrorCode PetscObjectStateIncrease(PetscObject obj)Logically Collective
Notes: object state is an integer which gets increased every time the object is changed internally. By saving and later querying the object state one can determine whether information about the object is still current. Currently, state is maintained for Vec and Mat objects.
This routine is mostly for internal use by PETSc; a developer need only call it after explicit access to an object's internals. Routines such as VecSet() or MatScale() already call this routine. It is also called, as a precaution, in VecRestoreArray(), MatRestoreRow(), MatDenseRestoreArray().
This routine is logically collective because state equality comparison needs to be possible without communication.