From 8340be48084fd8a37ba8eebbab8f5afcc9bc7113 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 31 Jul 2023 13:35:37 -0600
Subject: [PATCH] add another version of FooListToControlList

---
 libs/ardour/ardour/utils.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/ardour/utils.h b/libs/ardour/ardour/utils.h
index 4c14e9d67e..e549d81862 100644
--- a/libs/ardour/ardour/utils.h
+++ b/libs/ardour/ardour/utils.h
@@ -126,8 +126,19 @@ template<typename T> std::shared_ptr<ControlList> route_list_to_control_list (st
 
 template<typename T> std::shared_ptr<ControlList> stripable_list_to_control_list (StripableList& sl, std::shared_ptr<T> (Stripable::*get_control)() const) {
 	std::shared_ptr<ControlList> cl (new ControlList);
-	for (StripableList::const_iterator s = sl.begin(); s != sl.end(); ++s) {
-		std::shared_ptr<AutomationControl> ac = ((*s).get()->*get_control)();
+	for (auto const & s : sl) {
+		std::shared_ptr<AutomationControl> ac = (s.get()->*get_control)();
+		if (ac) {
+			cl->push_back (ac);
+		}
+	}
+	return cl;
+}
+
+template<typename T> std::shared_ptr<ControlList> stripable_list_to_control_list (std::shared_ptr<StripableList const> sl, std::shared_ptr<T> (Stripable::*get_control)() const) {
+	std::shared_ptr<ControlList> cl (new ControlList);
+	for (auto const & s : *sl) {
+		std::shared_ptr<AutomationControl> ac = (s.get()->*get_control)();
 		if (ac) {
 			cl->push_back (ac);
 		}