boost_exception/include/boost/exception/detail/is_output_streamable.hpp

//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)

#ifndef UUID_898984B4076411DD973EDFA055D89593
#define UUID_898984B4076411DD973EDFA055D89593

#include <ostream>

namespace
boost
    {
	namespace
	to_string_detail
		{
		template <bool>
		struct
		is_output_streamable_dispatch
			{
			enum e { value=1 };
			};

		template <>
		struct
		is_output_streamable_dispatch<false>
			{
			enum e { value=0 };
			};

        template <class T,class CharT,class Traits>
        char operator<<( std::basic_ostream<CharT,Traits> &, T const & );

		template <class T,class CharT,class Traits>
        struct
		is_output_streamable_impl
			{
			enum e { value=is_output_streamable_dispatch<1!=sizeof((*(std::basic_ostream<CharT,Traits>*)0)<<(*(T*)0))>::value };
			};
		}

	template <class T, class CharT=char, class Traits=std::char_traits<CharT> >
    struct
	is_output_streamable
		{
		enum e { value=to_string_detail::is_output_streamable_impl<T,CharT,Traits>::value };
		};
    }

#endif