From 6659107625a566d8b34718e9e307f42999dedd3e Mon Sep 17 00:00:00 2001
From: dP <dp@dpointer.org>
Date: Thu, 1 Apr 2021 14:14:20 +0300
Subject: [PATCH] Fix c++17 compilation

---
 src/citymania/cm_highlight_type.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/citymania/cm_highlight_type.hpp b/src/citymania/cm_highlight_type.hpp
index 79ca931c53..3a9a74c244 100644
--- a/src/citymania/cm_highlight_type.hpp
+++ b/src/citymania/cm_highlight_type.hpp
@@ -94,7 +94,7 @@ public:
 
 class TileIndexDiffCCompare{
 public:
-    bool operator()(const TileIndexDiffC &a, const TileIndexDiffC &b) {
+    bool operator()(const TileIndexDiffC &a, const TileIndexDiffC &b) const {
         if (a.x < b.x) return true;
         if (a.x == b.x && a.y < b.y) return true;
         return false;