bool operator!=(LyXGlueLength const & l1, LyXGlueLength const & l2);
/** If "data" is valid, the length represented by it is
stored into "result", if that is not 0. */
bool operator!=(LyXGlueLength const & l1, LyXGlueLength const & l2);
/** If "data" is valid, the length represented by it is
stored into "result", if that is not 0. */