Function dds_unregister_instance 

pub unsafe extern "C" fn dds_unregister_instance(
    writer: dds_entity_t,
    data: *const c_void,
) -> dds_return_t

@brief Unregisters an instance by instance @ingroup writing @component data_instance

This operation reverses the action of register instance, removes all information regarding the instance and unregisters an instance with a key value from the data writer.

@param[in] writer The writer to which instance is associated. @param[in] data The instance with the key value.

@returns A dds_return_t indicating success or failure.

@retval DDS_RETCODE_OK The operation was successful. @retval DDS_RETCODE_BAD_PARAMETER One of the given arguments is not valid. @retval DDS_RETCODE_ILLEGAL_OPERATION The operation is invoked on an inappropriate object.