// Usage:
// void fn(const string_type& str) {
//     std::cout << str << '\n';
// }
struct string_type : std::string_view
{
    // Takes const char*, std::string, std::string_view
    template <class T, class = std::enable_if_t<
        std::is_constructible_v<std::string_view, const T&>
    >>
    string_type(const T& str) noexcept
    : std::string_view(str)
    { }

    // Takes literal string
    template <size_t N>
    string_type(const char (&str)[N]) noexcept
    : std::string_view(str, N - 1)
    { }

    // Takes QString
    string_type(const QString& str) noexcept
    : qba(str.toLocal8Bit()) {
        this->operator=(std::string_view(qba->data(), qba->size()));
    }

private:
    std::optional<QByteArray> qba;
};