// (C) Copyright Jonathan Turkanis 2003.

 // 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.)

 // See http://www.boost.org/libs/iostreams for documentation.

 #ifndef BOOST_IOSTREAMS_DETAIL_IOS_HPP_INCLUDED

 #define BOOST_IOSTREAMS_DETAIL_IOS_HPP_INCLUDED

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif              

 #include <boost/config.hpp> // BOOST_MSVC.

 #include <boost/detail/workaround.hpp>

 #include <boost/iostreams/detail/config/wide_streams.hpp>

 #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES

 # if !BOOST_WORKAROUND(__MWERKS__, <= 0x3003)

 #  include <ios>

 # else

 #  include <istream>

 #  include <ostream>

 # endif

 #else 

 # include <exception>

 # include <iosfwd>

 #endif 

 namespace boost { namespace iostreams { namespace detail {

 #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------------------//

 # define BOOST_IOSTREAMS_BASIC_IOS(ch, tr)  std::basic_ios< ch, tr >

 # if !BOOST_WORKAROUND(__MWERKS__, <= 0x3003) && \

      !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \

      !BOOST_WORKAROUND(BOOST_MSVC, < 1300) \

      /**/

 #define BOOST_IOS                std::ios

 #define BOOST_IOSTREAMS_FAILURE  std::ios::failure

 # else

 #define BOOST_IOS                std::ios_base

 #define BOOST_IOSTREAMS_FAILURE  std::ios_base::failure

 # endif

 #else // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-----------------------//

 #define BOOST_IOS                          std::ios

 #define BOOST_IOSTREAMS_BASIC_IOS(ch, tr)  std::ios

 #define BOOST_IOSTREAMS_FAILURE            boost::iostreams::detail::failure

 class failure : std::exception {    

 public:

     explicit failure(const std::string& what_arg) : what_(what_arg) { }

     const char* what() const { return what_.c_str(); }

 private:

     std::string what_;

 };

 #endif // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //----------------------//

 } } } // End namespace failure, iostreams, boost.

 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_IOS_HPP_INCLUDED