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+
+#ifndef BOOST_CONTRACT_DETAIL_PP_KEYWORD_PRIVATE_HPP_
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_PRIVATE_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/contract/detail/preprocessor/keyword/utility/is.hpp>
+#include <boost/preprocessor/cat.hpp>
+
+/* PRIVATE */
+
+// Must expand to a single comma `,` (not local macros, do not #undefine).
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_PRIVATE_CAT_TO_COMMAprivate ,
+
+// Must expand to empty `` (not local macros, do not #undefine).
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_PRIVATE_CAT_TO_EMPTYprivate
+
+/* PUBLIC */
+
+// 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_IS_PRIVATE(tokens) \
+ BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS( \
+ BOOST_CONTRACT_DETAIL_PP_KEYWORD_PRIVATE_CAT_TO_COMMA, tokens)
+
+// Precondition: tokens must start with `private` (this can be
+// checked with `..._IS_PRIVATE` macro above).
+#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_REMOVE_PRIVATE(tokens) \
+ BOOST_PP_CAT(BOOST_CONTRACT_DETAIL_PP_KEYWORD_PRIVATE_CAT_TO_EMPTY, tokens)
+
+#endif // #include guard
+