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+
+#ifndef BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS_HPP_
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS_HPP_
+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/variadic/size.hpp>
+
+/* PRIVATE */
+
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS_1 0
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS_2 1
+
+/* PUBLIC */
+
+// Precondition: A macro named `cat_to_comma_prefix ## token-to-check` must be
+// #defined to expand to `,`.
+// Precondition: tokens must start with a token concatenable to a macro name
+// (e.g., a literal or integral token).
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS( \
+ cat_to_comma_prefix, tokens) \
+ BOOST_PP_CAT(BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS_, \
+ BOOST_PP_VARIADIC_SIZE(BOOST_PP_CAT(cat_to_comma_prefix, tokens)))
+
+#endif // #include guard
+