Incorrect use of `noexcept`

[the-moisrex]

    std::string subsystem() const noexcept;
    std::string   devtype() const noexcept;
    std::string   syspath() const noexcept;
    std::string   sysname() const noexcept;
    std::string    sysnum() const noexcept;
    std::string   devnode() const noexcept;

std::string throws if it fails to allocate storage for it; marking it as noexcept will just call std::terminate directly instead I believe.

May I suggest returning std::string_view instead? The lifetime the strings are tied to udev_device I believe.