glog print wchar_t?

[wqingzex]

I write this code to print wchar_t using glog:

std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
    std::mbstate_t state = std::mbstate_t();
    int len = 1 + std::wcsrtombs(nullptr, &wstr, 0, &state);
    std::vector<char> mbstr(len);
    std::wcsrtombs(&mbstr[0], &wstr, mbstr.size(), &state);

    out << &mbstr[0];
    return out;
}

std::ostream& operator<<(std::ostream& out, const std::wstring& str) {
   return operator<<(out, str.c_str());
}

but it does not work, why??

[seanchann]

refer here: https://code.google.com/p/google-glog/issues/detail?id=4