From 9e1610143f0e96b77ca962a7113d79a2fbcbf6f5 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Fri, 28 Dec 2018 17:33:35 -0500
Subject: partially fixed problems that arise in small systems by reworking the
 way that boundary edges are identified

---
 lib/include/array_hash.hpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 lib/include/array_hash.hpp

(limited to 'lib/include/array_hash.hpp')

diff --git a/lib/include/array_hash.hpp b/lib/include/array_hash.hpp
new file mode 100644
index 0000000..3b35e4a
--- /dev/null
+++ b/lib/include/array_hash.hpp
@@ -0,0 +1,27 @@
+
+#pragma once
+
+#include <array>
+#include <unordered_map>
+
+namespace std
+{
+    template<typename T, size_t N>
+    struct hash<array<T, N> >
+    {
+        typedef array<T, N> argument_type;
+        typedef size_t result_type;
+
+        result_type operator()(const argument_type& a) const
+        {
+            hash<T> hasher;
+            result_type h = 0;
+            for (result_type i = 0; i < N; ++i)
+            {
+                h = h * 31 + hasher(a[i]);
+            }
+            return h;
+        }
+    };
+}
+
-- 
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