add boost on mac

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

@@ -0,0 +1,80 @@
+
+#ifndef BOOST_CONTRACT_DETAIL_CHECKING_HPP_
+#define BOOST_CONTRACT_DETAIL_CHECKING_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/config.hpp>
+#include <boost/contract/detail/static_local_var.hpp>
+#include <boost/contract/detail/declspec.hpp>
+#include <boost/thread/mutex.hpp>
+#include <boost/noncopyable.hpp>
+
+namespace boost { namespace contract { namespace detail {
+
+#ifdef BOOST_MSVC
+    #pragma warning(push)
+    #pragma warning(disable: 4251) // Member w/o DLL spec (mutex_ type).
+#endif
+
+// RAII facility to disable assertions while checking other assertions.
+class BOOST_CONTRACT_DETAIL_DECLSPEC checking :
+    private boost::noncopyable // Non-copyable resource (might use mutex, etc.).
+{
+public:
+    explicit checking() {
+        #ifndef BOOST_CONTRACT_DISABLE_THREADS
+            init_locked();
+        #else
+            init_unlocked();
+        #endif
+    }
+
+    ~checking() {
+        #ifndef BOOST_CONTRACT_DISABLE_THREADS
+            done_locked();
+        #else
+            done_unlocked();
+        #endif
+    }
+    
+    static bool already() {
+        #ifndef BOOST_CONTRACT_DISABLE_THREADS
+            return already_locked();
+        #else
+            return already_unlocked();
+        #endif
+    }
+
+private:
+    void init_unlocked();
+    void init_locked();
+
+    void done_unlocked();
+    void done_locked();
+
+    static bool already_unlocked();
+    static bool already_locked();
+
+    struct mutex_tag;
+    typedef static_local_var<mutex_tag, boost::mutex> mutex;
+
+    struct checking_tag;
+    typedef static_local_var_init<checking_tag, bool, bool, false> flag;
+};
+
+#ifdef BOOST_MSVC
+    #pragma warning(pop)
+#endif
+
+} } } // namespace
+
+#ifdef BOOST_CONTRACT_HEADER_ONLY
+    #include <boost/contract/detail/inlined/detail/checking.hpp>
+#endif
+
+#endif // #include guard
+