|  | HDF5 Last Updated on 2025-10-31
    The HDF5 Field Guide | 
#include <src/H5Rpublic.h>
Opaque reference type. The same reference type is used for object, dataset region and attribute references. This is the type that should always be used with the current reference API.
| Data Fields | ||
| union { | ||
| uint8_t __data [(64)] | ||
| int64_t align | ||
| } | u | |
| uint8_t __data[(64)] | 
opaque data
| int64_t align | 
ensures alignment
| union { ... } u |