From 2f56f0caa2a222050d81ce54b3c2f61adb2ea7d4 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Thu, 4 Mar 2021 14:29:09 +0300
Subject: [PATCH] Add hash for geom::vector

---
 libs/geom/include/psemek/geom/vector.hpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/libs/geom/include/psemek/geom/vector.hpp b/libs/geom/include/psemek/geom/vector.hpp
index 77a46fce..bb20a72b 100644
--- a/libs/geom/include/psemek/geom/vector.hpp
+++ b/libs/geom/include/psemek/geom/vector.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <psemek/geom/detail/array.hpp>
+#include <psemek/util/hash.hpp>
 
 #include <iostream>
 #include <cstddef>
@@ -358,3 +359,21 @@ namespace psemek::geom
 	}
 
 }
+
+namespace std
+{
+
+	template <typename T, std::size_t N>
+	struct hash<::psemek::geom::vector<T, N>>
+	{
+		std::size_t operator()(::psemek::geom::vector<T, N> const & v) const noexcept
+		{
+			std::hash<T> h;
+			std::size_t r = 0;
+			for (std::size_t i = 0; i < N; ++i)
+				::psemek::util::hash_combine(r, h(v[i]));
+			return r;
+		}
+	};
+
+}