external_libraries/boost/libs/filesystem/v3/src/windows_file_codecvt.hpp

   1 //  filesystem windows_file_codecvt.hpp  -----------------------------------------------//
   2
   3 //  Copyright Beman Dawes 2009
   4
   5 //  Distributed under the Boost Software License, Version 1.0.
   6 //  See http://www.boost.org/LICENSE_1_0.txt
   7
   8 //  Library home page: http://www.boost.org/libs/filesystem
   9
  10 #ifndef BOOST_FILESYSTEM3_WIN_FILE_CODECVT_HPP
  11 #define BOOST_FILESYSTEM3_WIN_FILE_CODECVT_HPP
  12
  13 #include <boost/filesystem/v3/config.hpp>
  14 #include <locale>
  15
  16   //------------------------------------------------------------------------------------//
  17   //                                                                                    //
  18   //                          class windows_file_codecvt                                //
  19   //                                                                                    //
  20   //  Warning: partial implementation; even do_in and do_out only partially meet the    //
  21   //  standard library specifications as the "to" buffer must hold the entire result.   //
  22   //                                                                                    //
  23   //------------------------------------------------------------------------------------//
  24
  25   class BOOST_FILESYSTEM_DECL windows_file_codecvt
  26     : public std::codecvt< wchar_t, char, std::mbstate_t >
  27   {
  28   public:
  29     explicit windows_file_codecvt()
  30         : std::codecvt<wchar_t, char, std::mbstate_t>() {}
  31   protected:
  32
  33     virtual bool do_always_noconv() const throw() { return false; }
  34
  35     //  seems safest to assume variable number of characters since we don't
  36     //  actually know what codepage is active
  37     virtual int do_encoding() const throw() { return 0; }
  38
  39     virtual std::codecvt_base::result do_in(std::mbstate_t& state,
  40       const char* from, const char* from_end, const char*& from_next,
  41       wchar_t* to, wchar_t* to_end, wchar_t*& to_next) const;
  42
  43     virtual std::codecvt_base::result do_out(std::mbstate_t & state,
  44       const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next,
  45       char* to, char* to_end, char*& to_next) const;
  46
  47     virtual std::codecvt_base::result do_unshift(std::mbstate_t&,
  48         char* /*from*/, char* /*to*/, char* & /*next*/) const  { return ok; }
  49
  50     virtual int do_length(std::mbstate_t&,
  51       const char* /*from*/, const char* /*from_end*/, std::size_t /*max*/) const  { return 0; }
  52
  53     virtual int do_max_length() const throw () { return 0; }
  54   };
  55
  56 #endif  // BOOST_FILESYSTEM3_WIN_FILE_CODECVT_HPP