H5VLdatatype_get

herr_t H5VLdatatype_get(void *  dt,  hid_t connector_id,  H5VL_datatype_get_args_t *  args,
       hid_t dxpl_id,  void * *  req)

Gets datatype information through the VOL.

`dt`	Datatype object
`connector_id`	VOL connector identifier
`args`	Get arguments
`dxpl_id`	Data transfer property list
`req`	Async request object (can be null)

Non-negative on success, negative on failure.