to_string fixes

[SVN r44164]

test/is_output_streamable_test.cpp

@@ -0,0 +1,41 @@
+//Copyright (c) 2006-2008 Emil Dotchevski and Reverge Studios, Inc.
+
+//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/exception/detail/is_output_streamable.hpp>
+#include <boost/detail/lightweight_test.hpp>
+
+namespace
+n1
+    {
+    class
+    c1
+        {
+        };
+    }
+
+namespace
+n2
+    {
+    class
+    c2
+        {
+        };
+
+    std::ostream &
+    operator<<( std::ostream & s, c2 const & )
+        {
+        s << "c2";
+        return s;
+        }           
+    }
+
+int
+main()
+    {
+	BOOST_TEST( !boost::is_output_streamable<n1::c1>::value );
+	BOOST_TEST( boost::is_output_streamable<n2::c2>::value );
+	BOOST_TEST( boost::is_output_streamable<int>::value );
+    return boost::report_errors();
+    }