From 07725134993ac9cf5f62e23cd44a91913a1a073a Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 29 Jan 2018 22:21:59 +0100
Subject: [PATCH] LuaInstance: prepare for 3 argument signal/slot callbacks

---
 gtk2_ardour/luainstance.cc | 22 ++++++++++++++++++++++
 gtk2_ardour/luainstance.h  |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/gtk2_ardour/luainstance.cc b/gtk2_ardour/luainstance.cc
index 8f9572b98e..361b1e238c 100644
--- a/gtk2_ardour/luainstance.cc
+++ b/gtk2_ardour/luainstance.cc
@@ -2125,6 +2125,14 @@ LuaCallback::connect_2 (enum LuaSignal::LuaSignal ls, T ref, PBD::Signal2<void,
 			gui_context());
 }
 
+template <typename T, typename C1, typename C2, typename C3> void
+LuaCallback::connect_3 (enum LuaSignal::LuaSignal ls, T ref, PBD::Signal3<void, C1, C2, C3> *signal) {
+	signal->connect (
+			_connections, invalidator (*this),
+			boost::bind (&LuaCallback::proxy_3<T, C1, C2, C3>, this, ls, ref, _1, _2, _3),
+			gui_context());
+}
+
 template <typename T> void
 LuaCallback::proxy_0 (enum LuaSignal::LuaSignal ls, T ref) {
 	bool ok = true;
@@ -2167,3 +2175,17 @@ LuaCallback::proxy_2 (enum LuaSignal::LuaSignal ls, T ref, C1 a1, C2 a2) {
 		drop_callback (); /* EMIT SIGNAL */
 	}
 }
+
+template <typename T, typename C1, typename C2, typename C3> void
+LuaCallback::proxy_3 (enum LuaSignal::LuaSignal ls, T ref, C1 a1, C2 a2, C3 a3) {
+	bool ok = true;
+	{
+		const luabridge::LuaRef& rv ((*_lua_call)((int)ls, ref, a1, a2, a3));
+		if (! rv.cast<bool> ()) {
+			ok = false;
+		}
+	}
+	if (!ok) {
+		drop_callback (); /* EMIT SIGNAL */
+	}
+}
diff --git a/gtk2_ardour/luainstance.h b/gtk2_ardour/luainstance.h
index 60bbca7c88..d48ab8330a 100644
--- a/gtk2_ardour/luainstance.h
+++ b/gtk2_ardour/luainstance.h
@@ -70,6 +70,9 @@ private:
 
 	template <typename T, typename C1, typename C2> void connect_2 (enum LuaSignal::LuaSignal, T, PBD::Signal2<void, C1, C2>*);
 	template <typename T, typename C1, typename C2> void proxy_2 (enum LuaSignal::LuaSignal, T, C1, C2);
+
+	template <typename T, typename C1, typename C2, typename C3> void connect_3 (enum LuaSignal::LuaSignal, T, PBD::Signal3<void, C1, C2, C3>*);
+	template <typename T, typename C1, typename C2, typename C3> void proxy_3 (enum LuaSignal::LuaSignal, T, C1, C2, C3);
 };
 
 typedef boost::shared_ptr<LuaCallback> LuaCallbackPtr;