From c8e214cef4f9c5d5c58441daf146d89ed4716cc9 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Wed, 11 Jul 2018 03:20:18 +0200
Subject: [PATCH] Use Mixin::String so that string conversion is properly
 called for CElevationPlane

---
 src/blackmisc/geo/elevationplane.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/blackmisc/geo/elevationplane.h b/src/blackmisc/geo/elevationplane.h
index 0f774ad68..6522357d8 100644
--- a/src/blackmisc/geo/elevationplane.h
+++ b/src/blackmisc/geo/elevationplane.h
@@ -13,6 +13,7 @@
 #define BLACKMISC_GEO_ELEVATIONPLANE_H
 
 #include "blackmisc/geo/coordinategeodetic.h"
+#include "blackmisc/stringutils.h"
 #include "blackmisc/blackmiscexport.h"
 
 namespace BlackMisc
@@ -21,9 +22,16 @@ namespace BlackMisc
     {
         //! Plane of same elevation, can be a single point or larger area (e.g. airport)
         //! \remark 100km/h 1sec => 28m
-        class BLACKMISC_EXPORT CElevationPlane : public CCoordinateGeodetic
+        class BLACKMISC_EXPORT CElevationPlane :
+            public CCoordinateGeodetic,
+            public Mixin::String<CElevationPlane>
         {
         public:
+            //! Base type
+            using base_type = CCoordinateGeodetic;
+
+            BLACKMISC_DECLARE_USING_MIXIN_STRING(CElevationPlane)
+
             //! Properties by index
             enum ColumnIndex
             {