Catch exceptions by const reference

3 files changed, 9 insertions, 9 deletions

diff --git a/gtk2_ardour/ardour_ui.cc b/gtk2_ardour/ardour_ui.cc
index 3e3f3effb3..251bd31431 100644
--- a/gtk2_ardour/ardour_ui.cc
+++ b/gtk2_ardour/ardour_ui.cc
@@ -1969,7 +1969,7 @@ ARDOUR_UI::open_session ()
 		string default_session_folder = Config->get_default_session_parent_dir();
 		open_session_selector.add_shortcut_folder (default_session_folder);
 	}
-	catch (Glib::Error & e) {
+	catch (Glib::Error const& e) {
 		std::cerr << "open_session_selector.add_shortcut_folder() threw Glib::Error " << e.what() << std::endl;
 	}
 
@@ -3642,7 +3642,7 @@ ARDOUR_UI::load_session (const std::string& path, const std::string& snap_name,
 
 	/* this one is special */
 
-	catch (AudioEngine::PortRegistrationFailure& err) {
+	catch (AudioEngine::PortRegistrationFailure const& err) {
 
 		MessageDialog msg (err.what(),
 				   true,
@@ -3667,7 +3667,7 @@ ARDOUR_UI::load_session (const std::string& path, const std::string& snap_name,
 		}
 		goto out;
 	}
-	catch (SessionException e) {
+	catch (SessionException const& e) {
 		MessageDialog msg (string_compose(
 			                   _("Session \"%1 (snapshot %2)\" did not load successfully:\n%3"),
 			                   path, snap_name, e.what()),
@@ -3803,7 +3803,7 @@ ARDOUR_UI::build_session (const std::string& path, const std::string& snap_name,
 		new_session = new Session (*AudioEngine::instance(), path, snap_name, bus_profile);
 	}
 
-	catch (SessionException e) {
+	catch (SessionException const& e) {
 		cerr << "Here are the errors associated with this failed session:\n";
 		dump_errors (cerr);
 		cerr << "---------\n";
diff --git a/gtk2_ardour/luainstance.cc b/gtk2_ardour/luainstance.cc
index a37270e112..156ad11d34 100644
--- a/gtk2_ardour/luainstance.cc
+++ b/gtk2_ardour/luainstance.cc
@@ -1323,7 +1323,7 @@ LuaInstance::interactive_add (LuaScriptInfo::ScriptType type, int id)
 
 	try {
 		script = Glib::file_get_contents (spi->path);
-	} catch (Glib::FileError e) {
+	} catch (Glib::FileError const& e) {
 		string msg = string_compose (_("Cannot read script '%1': %2"), spi->path, e.what());
 		Gtk::MessageDialog am (msg);
 		am.run ();
@@ -1360,7 +1360,7 @@ LuaInstance::interactive_add (LuaScriptInfo::ScriptType type, int id)
 				string msg = string_compose (_("Session script '%1' instantiation failed: %2"), spd.name(), e.what ());
 				Gtk::MessageDialog am (msg);
 				am.run ();
-			} catch (SessionException e) {
+			} catch (SessionException const& e) {
 				string msg = string_compose (_("Loading Session script '%1' failed: %2"), spd.name(), e.what ());
 				Gtk::MessageDialog am (msg);
 				am.run ();
diff --git a/gtk2_ardour/luawindow.cc b/gtk2_ardour/luawindow.cc
index 4e02cd2b20..76f20178ec 100644
--- a/gtk2_ardour/luawindow.cc
+++ b/gtk2_ardour/luawindow.cc
@@ -464,7 +464,7 @@ LuaWindow::save_script ()
 			update_gui_state (); // XXX here?
 			append_text (X_("> ") + string_compose (_("Saved as %1"), sb.path));
 			return; // OK
-		} catch (Glib::FileError e) {
+		} catch (Glib::FileError const& e) {
 			msg = string_compose (_("Error saving file: %1"), e.what());
 			goto errorout;
 		}
@@ -516,7 +516,7 @@ LuaWindow::save_script ()
 		LuaScripting::instance().refresh (true);
 		append_text (X_("> ") + string_compose (_("Saved as %1"), path));
 		return; // OK
-	} catch (Glib::FileError e) {
+	} catch (Glib::FileError const& e) {
 		msg = string_compose (_("Error saving file: %1"), e.what());
 		goto errorout;
 	}
@@ -743,7 +743,7 @@ LuaWindow::ScriptBuffer::load ()
 		script = Glib::file_get_contents (path);
 		flags |= Buffer_Valid;
 		flags &= BufferFlags(~Buffer_Dirty);
-	} catch (Glib::FileError e) {
+	} catch (Glib::FileError const& e) {
 		return false;
 	}
 	return true;