Imported existing code

libraries/include/boost/signals2/detail/unique_lock.hpp

@@ -0,0 +1,42 @@
+/*
+  Provides a basic subset of boost::unique_lock functionality.  Provided only because
+  including boost/thread/locks.hpp requires linking to thread library
+*/
+// Copyright Frank Mori Hess 2008.
+// Distributed under the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/signals2 for library home page.
+
+#ifndef BOOST_SIGNALS2_UNIQUE_LOCK_HPP
+#define BOOST_SIGNALS2_UNIQUE_LOCK_HPP
+
+#include <boost/noncopyable.hpp>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<typename Mutex>
+      class unique_lock: public noncopyable
+      {
+      public:
+        unique_lock(Mutex &m): _mutex(m)
+        {
+          _mutex.lock();
+        }
+        ~unique_lock()
+        {
+          _mutex.unlock();
+        }
+      private:
+        Mutex &_mutex;
+      };
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+#endif  // BOOST_SIGNALS2_UNIQUE_LOCK_HPP