From 22ef2764846b7d2906f1a00f6662b5f9b944d058 Mon Sep 17 00:00:00 2001
From: Randy Mackay <rmackay9@yahoo.com>
Date: Wed, 6 Dec 2017 10:38:35 +0900
Subject: [PATCH] Rover: add const to mode::speed_error

---
 APMrover2/mode.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/APMrover2/mode.h b/APMrover2/mode.h
index 4dc687f3d1..645e5de9f0 100644
--- a/APMrover2/mode.h
+++ b/APMrover2/mode.h
@@ -82,7 +82,7 @@ public:
     virtual void set_desired_heading_and_speed(float yaw_angle_cd, float target_speed);
 
     // get speed error in m/s, returns zero for modes that do not control speed
-    float speed_error() { return _speed_error; }
+    float speed_error() const { return _speed_error; }
 
     // Navigation control variables
     // The instantaneous desired lateral acceleration in m/s/s