From: Frank Stein <dr.frank.stain@gmail.com>
Date: Fri, 21 Oct 2016 22:04:15 +0000 (+0200)
Subject: std::hash for const Entity implemented.
X-Git-Url: https://code.bitgloo.com/?a=commitdiff_plain;h=8a53139f94bdea60099723528079a6a514764f3a;p=clyne%2Fentityx.git

std::hash for const Entity implemented.
---

diff --git a/entityx/Entity.h b/entityx/Entity.h
index 9fcf676..e4a3871 100644
--- a/entityx/Entity.h
+++ b/entityx/Entity.h
@@ -1079,5 +1079,11 @@ template <> struct hash<entityx::Entity> {
     return static_cast<std::size_t>(entity.id().index() ^ entity.id().version());
   }
 };
+
+template <> struct hash<const entityx::Entity> {
+  std::size_t operator () (const entityx::Entity &entity) const {
+    return static_cast<std::size_t>(entity.id().index() ^ entity.id().version());
+  }
+};
 }