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-rw-r--r--src/lib/intmath/bits.h16
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diff --git a/src/lib/intmath/bits.h b/src/lib/intmath/bits.h
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+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_INTMATH_BITS_H
+#define TOR_INTMATH_BITS_H
+
+#include "lib/cc/torint.h"
+#include "lib/cc/compat_compiler.h"
+
+int tor_log2(uint64_t u64) ATTR_CONST;
+uint64_t round_to_power_of_2(uint64_t u64);
+int n_bits_set_u8(uint8_t v);
+
+#endif /* !defined(TOR_INTMATH_BITS_H) */