Annex D (normative) Compatibility features [depr]

wstring_convert<std::codecvt_utf8<wchar_t>> myconv;
std::string mbstring = myconv.to_bytes(L"Hello\n");
std::cout << mbstring;

namespace std {
  template<class Codecvt, class Elem = wchar_t,
           class WideAlloc = allocator<Elem>,
           class ByteAlloc = allocator<char>>
    class wstring_convert {
    public:
      using byte_string = basic_string<char, char_traits<char>, ByteAlloc>;
      using wide_string = basic_string<Elem, char_traits<Elem>, WideAlloc>;
      using state_type  = typename Codecvt::state_type;
      using int_type    = typename wide_string::traits_type::int_type;

      wstring_convert() : wstring_convert(new Codecvt) {}
      explicit wstring_convert(Codecvt* pcvt);
      wstring_convert(Codecvt* pcvt, state_type state);
      explicit wstring_convert(const byte_string& byte_err,
                               const wide_string& wide_err = wide_string());
      ~wstring_convert();

      wstring_convert(const wstring_convert&) = delete;
      wstring_convert& operator=(const wstring_convert&) = delete;

      wide_string from_bytes(char byte);
      wide_string from_bytes(const char* ptr);
      wide_string from_bytes(const byte_string& str);
      wide_string from_bytes(const char* first, const char* last);

      byte_string to_bytes(Elem wchar);
      byte_string to_bytes(const Elem* wptr);
      byte_string to_bytes(const wide_string& wstr);
      byte_string to_bytes(const Elem* first, const Elem* last);

      size_t converted() const noexcept;
      state_type state() const;

    private:
      byte_string byte_err_string;  // exposition only
      wide_string wide_err_string;  // exposition only
      Codecvt* cvtptr;              // exposition only
      state_type cvtstate;          // exposition only
      size_t cvtcount;              // exposition only
    };
}

• (3.1)
  byte_­err_­string — a byte string to display on errors
• (3.2)
  wide_­err_­string — a wide string to display on errors
• (3.3)
  cvtptr — a pointer to the allocated conversion object (which is freed when the wstring_­convert object is destroyed)
• (3.4)
  cvtstate — a conversion state object
• (3.5)
  cvtcount — a conversion count

namespace std {
  template<class Codecvt, class Elem = wchar_t, class Tr = char_traits<Elem>>
    class wbuffer_convert : public basic_streambuf<Elem, Tr> {
    public:
      using state_type = typename Codecvt::state_type;

      wbuffer_convert() : wbuffer_convert(nullptr) {}
      explicit wbuffer_convert(streambuf* bytebuf,
                               Codecvt* pcvt = new Codecvt,
                               state_type state = state_type());

      ~wbuffer_convert();

      wbuffer_convert(const wbuffer_convert&) = delete;
      wbuffer_convert& operator=(const wbuffer_convert&) = delete;

      streambuf* rdbuf() const;
      streambuf* rdbuf(streambuf* bytebuf);

      state_type state() const;

    private:
      streambuf* bufptr;            // exposition only
      Codecvt* cvtptr;              // exposition only
      state_type cvtstate;          // exposition only
  };
}

• (3.1)
  bufptr — a pointer to its underlying byte stream buffer
• (3.2)
  cvtptr — a pointer to the allocated conversion object (which is freed when the wbuffer_­convert object is destroyed)
• (3.3)
  cvtstate — a conversion state object