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-rw-r--r--lib/include/wolff/types.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/include/wolff/types.h b/lib/include/wolff/types.h
index 1bc8c4d..5bbaa6d 100644
--- a/lib/include/wolff/types.h
+++ b/lib/include/wolff/types.h
@@ -1,4 +1,7 @@
+#ifndef WOLFF_TYPES_H
+#define WOLFF_TYPES_H
+
#include <inttypes.h>
typedef uint_fast32_t v_t; // vertex and edge indices
@@ -25,3 +28,5 @@ typedef uint_fast64_t N_t; // cycle iterator
#define SCNL SCNuFAST16
#define SCNN SCNuFAST64
+#endif
+