+
+bool
+RouteGroupMember::use_group (PBD::Controllable::GroupControlDisposition gcd, bool (RouteGroup::*predicate)(void) const) const
+{
+ bool active_for_predicate = _route_group && (_route_group->*predicate)() && _route_group->is_active();
+
+ return ((gcd != PBD::Controllable::NoGroup) && (gcd != PBD::Controllable::ForGroup)) &&
+ _route_group &&
+ ((active_for_predicate && (gcd != PBD::Controllable::InverseGroup)) ||
+ (!active_for_predicate && (gcd == PBD::Controllable::InverseGroup)));
+}