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+// ----------------------------------------------------------------------------
+// msvc_disambiguater.hpp : msvc workarounds. (for put_{head|last} overloads)
+//               the trick was described in boost's list  by Aleksey Gurtovoy
+// ----------------------------------------------------------------------------
+
+//  Copyright Samuel Krempp 2003. Use, modification, and distribution are
+//  subject to 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/format for library home page
+
+// ----------------------------------------------------------------------------
+
+#ifndef BOOST_MSVC_DISAMBIGUATER_HPP
+#define BOOST_MSVC_DISAMBIGUATER_HPP
+
+#if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))
+
+#include <boost/format/group.hpp>
+#include <ostream>
+
+namespace boost {
+namespace io {
+namespace detail {
+
+template< class Ch, class Tr, class T >
+struct disambiguater
+{
+   template< typename U >
+   static void put_head(BOOST_IO_STD basic_ostream<Ch, Tr>& os, group1<U> const& x, long)
+   {
+       os << group_head(x.a1_); 
+   }
+   static void put_head(BOOST_IO_STD basic_ostream<Ch, Tr>& os, T const& x, int)
+   {
+   }
+   template< typename U >
+   static void put_last(BOOST_IO_STD basic_ostream<Ch, Tr>& os, group1<U> const& x, long)
+   {
+       os << group_last(x.a1_); 
+   }
+   static void put_last(BOOST_IO_STD basic_ostream<Ch, Tr>& os, T const& x, int)
+   {
+     os << x;
+   }
+};
+
+} // namespace detail
+} // namespace io
+} // namespace boost
+
+#endif // -__DECCXX_VER
+
+#endif // -BOOST_MSVC_DISAMBIGUATER_HPP