Fix addressof for nullptr_t values. Fixes #5487.

addressof_np_test.cpp

@@ -0,0 +1,50 @@
+//
+// Copyright 2013 Peter Dimov
+//
+// 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
+//
+
+#include <boost/utility/addressof.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <cstddef>
+
+#if defined( BOOST_NO_CXX11_NULLPTR )
+
+void nullptr_test()
+{
+}
+
+#else
+
+void nullptr_test()
+{
+    {
+        auto x = nullptr;
+        BOOST_TEST( boost::addressof(x) == &x );
+    }
+
+    {
+        auto const x = nullptr;
+        BOOST_TEST( boost::addressof(x) == &x );
+    }
+
+    {
+        auto volatile x = nullptr;
+        BOOST_TEST( boost::addressof(x) == &x );
+    }
+
+    {
+        auto const volatile x = nullptr;
+        BOOST_TEST( boost::addressof(x) == &x );
+    }
+}
+
+#endif
+
+int main()
+{
+    nullptr_test();
+    return boost::report_errors();
+}