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-rw-r--r--src/storage_number.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/storage_number.h b/src/storage_number.h
index 74d24a322..34ed0d89c 100644
--- a/src/storage_number.h
+++ b/src/storage_number.h
@@ -29,6 +29,7 @@ typedef uint32_t storage_number;
// extract the flags
#define get_storage_number_flags(value) ((((storage_number)value) & (1 << 24)) | (((storage_number)value) & (2 << 24)) | (((storage_number)value) & (4 << 24)))
+#define SN_EMPTY_SLOT 0x00000000
// checks
#define does_storage_number_exist(value) ((get_storage_number_flags(value) != 0)?1:0)