switch to using boost::signals2 instead of sigc++, at least for libardour. not finished yet, but compiles, loads sessions, records and can close a session without a crash

git-svn-id: svn://localhost/ardour2/branches/3.0@6372 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 73 insertions, 0 deletions

diff --git a/libs/ardour/session_handle.cc b/libs/ardour/session_handle.cc
new file mode 100644
index 0000000000..03671cfa68
--- /dev/null
+++ b/libs/ardour/session_handle.cc
@@ -0,0 +1,73 @@
+/*
+    Copyright (C) 2009 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "pbd/error.h"
+
+#include "ardour/session.h"
+#include "ardour/session_handle.h"
+
+#include "i18n.h"
+
+using namespace std;
+using namespace ARDOUR;
+using namespace PBD;
+
+SessionHandlePtr::SessionHandlePtr (Session* s)
+	: _session (s) 
+{
+	if (_session) {
+		_session_connections.add_connection (_session->GoingAway.connect (boost::bind (&SessionHandlePtr::session_going_away, this)));
+	}
+}	
+
+void
+SessionHandlePtr::set_session (Session* s)
+{
+	_session_connections.drop_connections ();
+
+	if (_session) {
+		_session = 0;
+	}
+
+	if (s) {
+		_session = s;
+		_session_connections.add_connection (_session->GoingAway.connect (boost::bind (&SessionHandlePtr::session_going_away, this)));
+	}
+}
+
+void
+SessionHandlePtr::session_going_away ()
+{
+	set_session (0);
+}
+
+/*-------------------------*/
+
+
+SessionHandleRef::SessionHandleRef (Session& s)
+	: _session (s) 
+{
+	scoped_connect (_session.GoingAway, boost::bind (&SessionHandleRef::session_going_away, this));
+}	
+
+void
+SessionHandleRef::session_going_away ()
+{
+	error << string_compose (_("programming error: %1"), "SessionHandleRef exists across sesssion deletion!") << endmsg;
+}