rem: VOLUME_ANALYZE_CONTROLLER* new_expr(void) const { return new VOLUME_ANALYZE_CONTROLLER(*this); }
add: VOLUME_ANALYZE_CONTROLLER* new_expr(void) const { return new VOLUME_ANALYZE_CONTROLLER(); }
context:   VOLUME_ANALYZE_CONTROLLER* new_expr(void) const { return new VOLUME_ANALYZE_CONTROLLER(*this); }