From d6e98a054f356d2df10af7be45096b33ec20812d Mon Sep 17 00:00:00 2001
From: Randy Mackay <rmackay9@yahoo.com>
Date: Wed, 15 Jun 2022 12:24:26 +0900
Subject: [PATCH] Copter: get_rangefinder_height_interpolated_cm made const

---
 ArduCopter/Copter.h    | 6 ++----
 ArduCopter/sensors.cpp | 2 +-
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/ArduCopter/Copter.h b/ArduCopter/Copter.h
index c39e378951..362b1a4558 100644
--- a/ArduCopter/Copter.h
+++ b/ArduCopter/Copter.h
@@ -256,10 +256,8 @@ private:
         uint32_t glitch_cleared_ms; // system time glitch cleared
     } rangefinder_state, rangefinder_up_state;
 
-    /*
-      return rangefinder height interpolated using inertial altitude
-     */
-    bool get_rangefinder_height_interpolated_cm(int32_t& ret);
+    // return rangefinder height interpolated using inertial altitude
+    bool get_rangefinder_height_interpolated_cm(int32_t& ret) const;
 
     class SurfaceTracking {
     public:
diff --git a/ArduCopter/sensors.cpp b/ArduCopter/sensors.cpp
index 54968f092f..afa8c7e333 100644
--- a/ArduCopter/sensors.cpp
+++ b/ArduCopter/sensors.cpp
@@ -135,7 +135,7 @@ bool Copter::rangefinder_up_ok() const
   difference between the inertial height at that time and the current
   inertial height to give us interpolation of height from rangefinder
  */
-bool Copter::get_rangefinder_height_interpolated_cm(int32_t& ret)
+bool Copter::get_rangefinder_height_interpolated_cm(int32_t& ret) const
 {
     if (!rangefinder_alt_ok()) {
         return false;