introduce flag for emergency menu exit

examples/main.cpp

@@ -33,24 +33,30 @@ int main(int argc, char** argv)
 	//screen.ForceHandleCtrlZ(true);
 	option.on_enter = screen.ExitLoopClosure();
 	auto menu = ftxui::Menu(&examples, &selectedExample, option);
-	
+	bool emergencyExit = false;
 	menu |= ftxui::CatchEvent(
 	[&](ftxui::Event event)
 	{
 		if (event == ftxui::Event::CtrlC || event == ftxui::Event::CtrlZ)
 		{
 			screen.ExitLoopClosure()();
-			exit(0);
+			emergencyExit = true;
 		}
 		return false;
 	});
 	screen.Loop(menu);
 
-	if (selectedExample >= examples.size()) throw std::runtime_error("Invalid menu selection!");
+	if (!emergencyExit)
+	{
+		if (selectedExample >= examples.size())
+		{
+			throw std::runtime_error("Invalid menu selection!");
+		}
 
 		std::unique_ptr<IGraphicsApp> app(EXAMPLE_APPS[selectedExample].second());
 
 		GraphicsAppManager manager(app.get());
 		manager.Run();
+	}
 	return 0;
 }