# 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 "petsc.h"
    int PetscObjectDereference(PetscObject obj)

Collective on PetscObject

### Input Parameter

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

### See Also

PetscObjectCompose(), PetscObjectReference()

Level:advanced
Location: src/sys/src/objects/inherit.c
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