From a811583380f8181c537094b12bd5e18bce75da50 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 17 May 2022 23:29:08 +0200
Subject: [PATCH] Add API to query registered controllers

---
 libs/pbd/controllable.cc    | 11 +++++++++++
 libs/pbd/pbd/controllable.h |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/libs/pbd/controllable.cc b/libs/pbd/controllable.cc
index e9fd872609..43c385349c 100644
--- a/libs/pbd/controllable.cc
+++ b/libs/pbd/controllable.cc
@@ -145,6 +145,17 @@ Controllable::by_id (const ID& id)
 	return boost::shared_ptr<Controllable>();
 }
 
+Controllable::ControllableSet
+Controllable::registered_controllables ()
+{
+	ControllableSet rv;
+	Glib::Threads::RWLock::ReaderLock lm (registry_lock);
+	for (auto const& i : registry) {
+		rv.insert (i->shared_from_this ());
+	}
+	return rv;
+}
+
 void
 Controllable::dump_registry ()
 {
diff --git a/libs/pbd/pbd/controllable.h b/libs/pbd/pbd/controllable.h
index 7f4a202b7f..6494484ae5 100644
--- a/libs/pbd/pbd/controllable.h
+++ b/libs/pbd/pbd/controllable.h
@@ -169,6 +169,10 @@ public:
 	static boost::shared_ptr<Controllable> by_id (const PBD::ID&);
 	static void dump_registry ();
 
+
+	typedef std::set<boost::shared_ptr<Controllable>> ControllableSet;
+	static ControllableSet registered_controllables ();
+
 	static const std::string xml_node_name;
 
 protected: