petsc-3.10.5 2019-03-28
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# PetscObjectDereference

Indicates to any PetscObject that it is being referenced by one less PetscObject. This decreases the reference count for that object by one.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode  PetscObjectDereference(PetscObject obj)

Collective on PetscObject if reference reaches 0 otherwise Logically Collective

### Input Parameter

obj -the PETSc object; this must be cast with (PetscObject), for example, PetscObjectDereference((PetscObject)mat);

### Notes

PetscObjectDestroy(PetscObject *obj) sets the obj pointer to null after the call, this routine does not.

### See Also

PetscObjectCompose(), PetscObjectReference()

### Level

advanced

### Location

src/sys/objects/inherit.c
Index of all Sys routines
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Index of all manual pages