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-rw-r--r--src/H5VLpublic.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/H5VLpublic.h b/src/H5VLpublic.h
index ae423bb..b276128 100644
--- a/src/H5VLpublic.h
+++ b/src/H5VLpublic.h
@@ -356,9 +356,10 @@ typedef struct H5VL_request_class_t {
* filters. Subsequent values should be obtained from the HDF5 development
* team at help@hdfgroup.org.
*/
-typedef unsigned H5VL_class_value_t;
+typedef int H5VL_class_value_t;
/* VOL connector identifier values */
+#define H5_VOL_INVALID (-1) /* Invalid ID for VOL connector iD */
#define H5_VOL_NATIVE 0 /* Native HDF5 file formnat VOL connector */
#define H5_VOL_RESERVED 256 /* VOL connector IDs below this value are reserved for library use */
#define H5_VOL_MAX 65535 /* Maximum VOL connector ID */