throw_exception() now ensures that the exception type passed to it derives publicly from std::exception.

[SVN r45041]

test/throw_exception_fail.cpp

@@ -0,0 +1,18 @@
+//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/throw_exception.hpp>
+
+struct
+my_exception
+	{
+	};
+
+void
+tester()
+    {
+	//Must not compile, throw_exception requires exception types to derive std::exception.
+	boost::throw_exception(my_exception());
+    }