From 8a118fc294d2b4d1ff174bb67da866b8d3a52a95 Mon Sep 17 00:00:00 2001
From: Sven Scharmentke <sven@vastlimits.com>
Date: Thu, 11 Jul 2019 08:28:57 +0200
Subject: [PATCH] Support hashing.

This enabled hashing so that unordered_map are supported.
---
 enum.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/enum.h b/enum.h
index 3ba66b3..6618a7a 100644
--- a/enum.h
+++ b/enum.h
@@ -949,6 +949,16 @@ operator >>(std::basic_istream<Char, Traits>& stream, Enum &value)             \
         stream.setstate(std::basic_istream<Char, Traits>::failbit);            \
                                                                                \
     return stream;                                                             \
+}                                                                              \
+                                                                               \
+namespace std {                                                                \
+template <> struct hash<Enum>                                                  \
+{                                                                              \
+   size_t operator()(const Enum &x) const                                      \
+   {                                                                           \
+      return std::hash<size_t>()(x._to_index());                               \
+   }                                                                           \
+};                                                                             \
 }