1 files changed, 27 insertions, 0 deletions
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;
+        }
+    };
+}
+