From 3bf8a3c59ee12c202b517ee5329d78a60fa55055 Mon Sep 17 00:00:00 2001
From: Reinder Feenstra <reinderfeenstra@gmail.com>
Date: Mon, 21 Dec 2020 23:09:52 +0100
Subject: [PATCH] TileRotate: added operator +=

---
 shared/src/traintastic/board/tilerotate.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/shared/src/traintastic/board/tilerotate.hpp b/shared/src/traintastic/board/tilerotate.hpp
index be792cf9..8dbbede5 100644
--- a/shared/src/traintastic/board/tilerotate.hpp
+++ b/shared/src/traintastic/board/tilerotate.hpp
@@ -43,6 +43,12 @@ constexpr TileRotate operator +(TileRotate lhs, TileRotate rhs)
   return static_cast<TileRotate>((static_cast<std::underlying_type_t<TileRotate>>(lhs) + static_cast<std::underlying_type_t<TileRotate>>(rhs)) % 8);
 }
 
+constexpr TileRotate& operator +=(TileRotate& lhs, TileRotate rhs)
+{
+  lhs = lhs + rhs;
+  return lhs;
+}
+
 constexpr TileRotate operator -(TileRotate lhs, TileRotate rhs)
 {
   return static_cast<TileRotate>((static_cast<std::underlying_type_t<TileRotate>>(lhs) + 8 - static_cast<std::underlying_type_t<TileRotate>>(rhs)) % 8);