From 0edd0c2abcc27116bfa5e7659ef7056905d5689f Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 9 Oct 2020 17:32:45 +0200
Subject: [PATCH] Do not bind pure virtual functions, use indirection

This fixes Windows/MSVC builds, where linking fails due
to binding a pure virtual function.
---
 libs/ardour/ardour/vst3_plugin.h | 2 ++
 libs/ardour/vst3_plugin.cc       | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/ardour/vst3_plugin.h b/libs/ardour/ardour/vst3_plugin.h
index 5b31fbfc6c..0110c84781 100644
--- a/libs/ardour/ardour/vst3_plugin.h
+++ b/libs/ardour/ardour/vst3_plugin.h
@@ -212,6 +212,8 @@ private:
 	void psl_subscribe_to (boost::shared_ptr<ARDOUR::AutomationControl>, FIDString);
 	void psl_stripable_property_changed (PBD::PropertyChange const&);
 
+	void foward_signal (Presonus::IContextInfoHandler2*, FIDString) const;
+
 	PBD::ScopedConnectionList   _strip_connections;
 	PBD::ScopedConnectionList   _ac_connection_list;
 	std::set<Evoral::Parameter> _ac_subscriptions;
diff --git a/libs/ardour/vst3_plugin.cc b/libs/ardour/vst3_plugin.cc
index 7b3c7dcefd..c4476fa659 100644
--- a/libs/ardour/vst3_plugin.cc
+++ b/libs/ardour/vst3_plugin.cc
@@ -2692,7 +2692,14 @@ VST3PI::psl_subscribe_to (boost::shared_ptr<ARDOUR::AutomationControl> ac, FIDSt
 		return;
 	}
 
-	ac->Changed.connect_same_thread (_ac_connection_list, boost::bind (&IContextInfoHandler2::notifyContextInfoChange, nfo2.get(), id));
+	ac->Changed.connect_same_thread (_ac_connection_list, boost::bind (&VST3PI::foward_signal, this, nfo2.get(), id));
+}
+
+void
+VST3PI::foward_signal (IContextInfoHandler2* handler, FIDString id) const
+{
+	assert (handler);
+	handler->notifyContextInfoChange (id);
 }
 
 void