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

From cppreference.com
< cpp‎ | locale‎ | wbuffer convert

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𝄋

### See also

(constructor) | constructs a new wbuffer_convert (public member function)

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