msvc_disambiguater.hpp

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// -*- C++ -*-
//  Boost general library 'format'   ---------------------------
//  See http://www.boost.org for updates, documentation, and revision history.

//  (C) Samuel Krempp 2001
//                  [e-mail]
//  Permission to copy, use, modify, sell and
//  distribute this software is granted provided this copyright notice appears
//  in all copies. This software is provided "as is" without express or implied
//  warranty, and with no claim as to its suitability for any purpose.

// ideas taken from R黡iger Loos's format class
// and Karl Nelson's ofstream

// ----------------------------------------------------------------------------
// msvc_disambiguater.hpp : msvc workarounds. (for put_{head|last} overloads)
//                          the trick was described in boost's list  by Aleksey Gurtovoy
// ----------------------------------------------------------------------------


#ifndef BOOST_MSVC_DISAMBIGUATER_HPP
#define BOOST_MSVC_DISAMBIGUATER_HPP

#if BOOST_WORKAROUND( BOOST_MSVC, <= 1300)  // this whole header is specifically for msvc

#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 // -BOOST_MSVC

#endif // -BOOST_MSVC_DISAMBIGUATER_HPP