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

#include <codecvt>
#include <iostream>
#include <locale>
#include <sstream>
int main()
{
    // 将UTF-8转换为UCS4
    std::stringbuf utf8buf("z\u00df\u6c34\U0001d10b");
                       // 或 "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b"
                       // 或 u8"zß水𝄋"
    std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv(&utf8buf);
    std::wistream ucsbuf(&conv);
    std::cout << "通过wbuffer_convert从UTF-8 stringbuf读取: "
              << std::hex << std::showbase;
    for (wchar_t c; ucsbuf.get(c);)
        std::cout << static_cast<std::wint_t>(c) << ' ';
    // 复用同一wbuffer_convert处理UCS4到UTF-8的输出
    conv.rdbuf(std::cout.rdbuf());
    std::wostream out(&conv);
    std::cout << "\n通过wbuffer_convert向std::cout发送UCS4数据: ";
    out << L"z\u00df\u6c34\U0001d10b\n";
}