# PetscObjectStateIncrease

Increases the state of any PetscObject, regardless of the type.

### Synopsis

    #include "petsc.h"
    PetscErrorCode PETSC_DLLEXPORT PetscObjectStateIncrease(PetscObject obj)

Not Collective

### Input Parameter

obj -any PETSc object, for example a Vec, Mat or KSP. This must be cast with a (PetscObject), for example, PetscObjectStateIncrease((PetscObject)mat);

Notes: object state is an integer which gets increased every time the object is changed. 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, MatRestoreArray.

seealso: PetscObjectStateQuery

Level:developer
Location:src/sys/src/objects/state.c
Index of all Sys routines
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