From 862ec14e06751ba674ae8e8cbfcdddd81eabd4f9 Mon Sep 17 00:00:00 2001
From: "Daniel J. Hofmann" <daniel@trvx.org>
Date: Wed, 10 May 2017 15:07:14 +0200
Subject: [PATCH] Asserts Valid Iterators in Roundabout Exit Invalidation, see
 #4024

---
 src/extractor/guidance/roundabout_handler.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/extractor/guidance/roundabout_handler.cpp b/src/extractor/guidance/roundabout_handler.cpp
index 6095d405b..d1deba7cb 100644
--- a/src/extractor/guidance/roundabout_handler.cpp
+++ b/src/extractor/guidance/roundabout_handler.cpp
@@ -1,6 +1,7 @@
 #include "extractor/guidance/roundabout_handler.hpp"
 #include "extractor/guidance/constants.hpp"
 
+#include "util/assert.hpp"
 #include "util/bearing.hpp"
 #include "util/coordinate_calculation.hpp"
 #include "util/guidance/name_announcements.hpp"
@@ -158,6 +159,8 @@ void RoundaboutHandler::invalidateExitAgainstDirection(const NodeID from_nid,
         }
     }
 
+    OSRM_ASSERT(invalidate_from <= invalidate_to, coordinates[from_nid]);
+
     // Exiting roundabouts at an entry point is technically a data-modelling issue.
     // This workaround handles cases in which an exit precedes and entry. The resulting
     // u-turn against the roundabout direction is invalidated.