Increases the state of any PetscObject
PetscErrorCode PetscObjectStateIncrease(PetscObject obj)
obj -any PETSc object, for example a Vec, Mat or KSP. This must be
cast with a (PetscObject), for example,
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.
Index of all Sys routines
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Index of all manual pages