// यूनिकोड
    static char const u8s[] = "\xE0\xA4\xAF\xE0\xA5\x82\xE0\xA4\xA8\xE0\xA4\xBF\xE0\xA4\x95\xE0\xA5\x8B\xE0\xA4\xA1";
    using namespace ww898::utf;
    std::u16string u16;
    convz<utf_selector_t<decltype(*u8s)>, utf16>(u8s, std::back_inserter(u16));
    std::u32string u32;
    conv<utf16, utf_selector_t<decltype(u32)::value_type>>(u16.begin(), u16.end(), std::back_inserter(u32));
    std::vector<char> u8;
    convz<utf32, utf8>(u32.data(), std::back_inserter(u8));
    std::wstring uw;
    conv<utf8, utfw>(u8s, u8s + sizeof(u8s), std::back_inserter(uw));
    auto u8r = conv<char>(uw);
    auto u16r = conv<char16_t>(u16);
    auto uwr = convz<wchar_t>(u8s);
    auto u32r = conv<char32_t>(std::string_view(u8r.data(), u8r.size())); // C++17 only
    static_assert(std::is_same<utf_selector<decltype(*u8s)>, utf_selector<decltype(u8)::value_type>>::value, "Fail");
    static_assert(
        std::is_same<utf_selector_t<decltype(u16)::value_type>, utf_selector_t<decltype(uw)::value_type>>::value !=
        std::is_same<utf_selector_t<decltype(u32)::value_type>, utf_selector_t<decltype(uw)::value_type>>::value, "Fail");