#ifndef BOOST_ARCHIVE_CODECVT_NULL_HPP

 #define BOOST_ARCHIVE_CODECVT_NULL_HPP

 // MS compatible compilers support #pragma once

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

 # pragma once

 #endif

 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

 // codecvt_null.hpp:

 // (C) Copyright 2004 Robert Ramey - http://www.rrsd.com .

 // Use, modification and distribution is 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 for updates, documentation, and revision history.

 #include <locale>

 #include <cstddef>

 #include <boost/config.hpp>

 namespace std{

     #if defined(__LIBCOMO__)

         using ::mbstate_t;

     #elif defined(__QNXNTO__)

         using std::mbstate_t;

     #elif defined(BOOST_DINKUMWARE_STDLIB) && BOOST_DINKUMWARE_STDLIB == 1

         using ::mbstate_t;

     #elif defined(__SGI_STL_PORT)

     #elif defined(BOOST_NO_STDC_NAMESPACE)

         using ::codecvt;

         using ::mbstate_t;

     #endif

 } // namespace std

 namespace boost {

 namespace archive {

 template<class Ch>

 class codecvt_null;

 template<>

 class codecvt_null<char> : public std::codecvt<char, char, std::mbstate_t>

 {

     virtual bool do_always_noconv() const throw() {

         return true;

     }

 public:

     explicit codecvt_null(std::size_t no_locale_manage = 0) :

         std::codecvt<char, char, std::mbstate_t>(no_locale_manage)

     {}

 };

 template<>

 class codecvt_null<wchar_t> : public std::codecvt<wchar_t, char, std::mbstate_t>

 {

     virtual std::codecvt_base::result

     do_out(

         std::mbstate_t & state,

         const wchar_t * first1,

         const wchar_t * last1,

         const wchar_t * & next1,

         char * first2,

         char * last2,

         char * & next2

     ) const;

     virtual std::codecvt_base::result

     do_in(

         std::mbstate_t & state,

         const char * first1,

         const char * last1,

         const char * & next1,

         wchar_t * first2,

         wchar_t * last2,

         wchar_t * & next2

     ) const;

     virtual int do_encoding( ) const throw( ){

         return sizeof(wchar_t) / sizeof(char);

     }

     virtual int do_max_length( ) const throw( ){

         return do_encoding();

     }

 };

 } // namespace archive

 } // namespace boost

 #endif //BOOST_ARCHIVE_CODECVT_NULL_HPP