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+
+#ifndef BOOST_CONTRACT_DETAIL_NOOP_HPP_
+#define BOOST_CONTRACT_DETAIL_NOOP_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
+
+// Following must be expressions, not statements (as used with if.., etc.).
+
+#define BOOST_CONTRACT_DETAIL_NOOP ((void)0)
+
+// Following always compiles but never evaluates cond (so check correct syntax).
+#define BOOST_CONTRACT_DETAIL_NOEVAL(cond) \
+ (true || (cond) ? BOOST_CONTRACT_DETAIL_NOOP : BOOST_CONTRACT_DETAIL_NOOP)
+
+#endif // #include guard
+