std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf (3) - Linux Manuals

std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf: std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf

NAME

std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf - std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf

Synopsis

Defined in header <locale>
std::streambuf* rdbuf() const; (1)
std::streambuf* rdbuf( std::streambuf* bytebuf ); (2)

1) returns the pointer to the underlying byte stream
2) replaces the associated byte stream with bytebuf .

Return value

1) the current underlying byte stream
2) the previous byte stream

Example

// Run this code

  #include <iostream>
  #include <sstream>
  #include <locale>
  #include <codecvt>
  int main()
  {
      // convert UTF-8 to UCS4
      std::stringbuf utf8buf(u8"z\u00df\u6c34\U0001d10b"); // or u8"zß水𝄋"
                         // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
      std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv(&utf8buf);
      std::wistream ucsbuf(&conv);
      std::cout << "Reading from a UTF-8 stringbuf via wbuffer_convert:\n";
      for(wchar_t c; ucsbuf.get(c); )
          std::cout << std::hex << std::showbase << c << '\n';

      // reuse the same wbuffer_convert to handle UCS4 to UTF-8 output
      conv.rdbuf(std::cout.rdbuf());
      std::wostream out(&conv);
      std::cout << "Sending UCS4 data to std::cout via wbuffer_convert:\n";
      out << L"z\u00df\u6c34\U0001d10b\n";
  }

Output:

  Reading from a UTF-8 stringbuf via wbuffer_convert:
  0x7a
  0xdf
  0x6c34
  0x1d10b
  Sending UCS4 data to std::cout via wbuffer_convert:
  zß水𝄋