add boost on mac

macx64/include/boost/contract/detail/assert.hpp

@@ -0,0 +1,28 @@
+
+#ifndef BOOST_CONTRACT_DETAIL_ASSERT_HPP_
+#define BOOST_CONTRACT_DETAIL_ASSERT_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/core/exception.hpp>
+#include <boost/contract/detail/noop.hpp>
+#include <boost/preprocessor/stringize.hpp>
+
+// In detail because used by both ASSERT and CHECK.
+// Use ternary operator `?:` and no trailing `;` here to allow `if(...) ASSERT(
+// ...); else ...` (won't compile if expands using an if statement instead even
+// if wrapped by {}, and else won't compile if expands trailing `;`).
+#define BOOST_CONTRACT_DETAIL_ASSERT(cond) \
+    /* no if-statement here */ \
+    ((cond) ? \
+        BOOST_CONTRACT_DETAIL_NOOP \
+    : \
+        throw boost::contract::assertion_failure( \
+                __FILE__, __LINE__, BOOST_PP_STRINGIZE(cond)) \
+    ) /* no ; here */
+
+#endif // #include guard
+