Use new boost::optional API

get_value_or() has been deprecated since boost 1.56

libs/ardour/file_source.cc

@@ -296,7 +296,7 @@ FileSource::find (Session& s, DataType type, const string& path, bool must_exist
 
 			/* more than one match: ask the user */
 
-                        int which = FileSource::AmbiguousFileName (path, de_duped_hits).get_value_or (-1);
+                        int which = FileSource::AmbiguousFileName (path, de_duped_hits).value_or (-1);
 
                         if (which < 0) {
                                 goto out;

libs/ardour/io.cc

@@ -231,7 +231,7 @@ IO::remove_port (boost::shared_ptr<Port> port, void* src)
 	after.set (port->type(), after.get (port->type()) - 1);
 
 	boost::optional<bool> const r = PortCountChanging (after); /* EMIT SIGNAL */
-	if (r.get_value_or (false)) {
+	if (r.value_or (false)) {
 		return -1;
 	}
 
@@ -1398,7 +1398,7 @@ IO::enable_connecting ()
 	Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock());
 	connecting_legal = true;
 	boost::optional<int> r = ConnectingLegal ();
-	return r.get_value_or (0);
+	return r.value_or (0);
 }
 
 void

libs/ardour/route.cc

@@ -1076,7 +1076,7 @@ Route::add_processors (const ProcessorList& others, boost::shared_ptr<Processor>
 
 		if (flags != None) {
 			boost::optional<int> rv = PluginSetup (boost::dynamic_pointer_cast<Route>(shared_from_this ()), pi, flags);  /* EMIT SIGNAL */
-			int mode = rv.get_value_or (0);
+			int mode = rv.value_or (0);
 			switch (mode & 3) {
 				case 1:
 					to_skip.push_back (*i); // don't add this one;

libs/ardour/session_state.cc

@@ -961,7 +961,7 @@ Session::load_state (string snapshot_name)
 		/* there is pending state from a crashed capture attempt */
 
 		boost::optional<int> r = AskAboutPendingState();
-		if (r.get_value_or (1)) {
+		if (r.value_or (1)) {
 			state_was_pending = true;
 		}
 	}
@@ -1540,7 +1540,7 @@ Session::set_state (const XMLNode& node, int version)
 		assert (AudioEngine::instance()->running ());
 		if (_base_sample_rate != AudioEngine::instance()->sample_rate ()) {
 			boost::optional<int> r = AskAboutSampleRateMismatch (_base_sample_rate, _current_sample_rate);
-			if (r.get_value_or (0)) {
+			if (r.value_or (0)) {
 				goto out;
 			}
 		}
@@ -2376,7 +2376,7 @@ retry:
 			}
 
 			if (!no_questions_about_missing_files) {
-				user_choice = MissingFile (this, err.path, err.type).get_value_or (-1);
+				user_choice = MissingFile (this, err.path, err.type).value_or (-1);
 			} else {
 				user_choice = -2;
 			}
@@ -3217,7 +3217,7 @@ int
 Session::ask_about_playlist_deletion (boost::shared_ptr<Playlist> p)
 {
 	boost::optional<int> r = AskAboutPlaylistDeletion (p);
-	return r.get_value_or (1);
+	return r.value_or (1);
 }
 
 void

libs/ardour/tempo_map_importer.cc

@@ -87,7 +87,7 @@ TempoMapImporter::_prepare_move ()
 {
 	// Prompt user for verification
 	boost::optional<bool> replace = Prompt (_("This will replace the current tempo map!\nAre you sure you want to do this?"));
-	return replace.get_value_or (false);
+	return replace.value_or (false);
 }
 
 void

libs/midi++2/mtc.cc

@@ -187,7 +187,7 @@ Parser::process_mtc_quarter_frame (MIDI::byte *msg)
 
 			boost::optional<bool> res = mtc_skipped ();
 
-			if (res.get_value_or (false)) {
+			if (res.value_or (false)) {
 
 				/* no error, reset next expected frame */
 

libs/midi++2/parser.cc

@@ -390,7 +390,7 @@ Parser::scanner (unsigned char inbyte)
 	if (rtmsg) {
 		boost::optional<int> res = edit (&inbyte, 1);
 
-		if (res.get_value_or (1) >= 0 && !_offline) {
+		if (res.value_or (1) >= 0 && !_offline) {
 			realtime_msg (inbyte);
 		}
 
@@ -427,7 +427,7 @@ Parser::scanner (unsigned char inbyte)
 
 			boost::optional<int> res = edit (msgbuf, msgindex);
 
-			if (res.get_value_or (1) >= 0) {
+			if (res.value_or (1) >= 0) {
 				if (!possible_mmc (msgbuf, msgindex) || _mmc_forward) {
 					if (!possible_mtc (msgbuf, msgindex) || _mtc_forward) {
 						if (!_offline) {
@@ -503,7 +503,7 @@ Parser::scanner (unsigned char inbyte)
 
                 edit_result = edit (msgbuf, msgindex);
 
-		if (edit_result.get_value_or (1)) {
+		if (edit_result.value_or (1)) {
 
 			/* message not cancelled by an editor */