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-rw-r--r--src/H5public.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/H5public.h b/src/H5public.h
index 7bacb3d..3b89879 100644
--- a/src/H5public.h
+++ b/src/H5public.h
@@ -176,6 +176,7 @@ H5_GCC_DIAG_ON(long-long)
#else
# error "nothing appropriate for hsize_t"
#endif
+#define HSIZE_UNDEF ((hsize_t)(hssize_t)(-1))
/*
* File addresses have their own types.