From eb1e3670855f9e18df3b86ceec37468361d2c5d3 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Mon, 4 Jul 2022 18:22:42 +0300
Subject: [PATCH] Implement spaceship operator for geom::vector

---
 libs/geom/include/psemek/geom/vector.hpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libs/geom/include/psemek/geom/vector.hpp b/libs/geom/include/psemek/geom/vector.hpp
index d9a5daac..ddd56b8f 100644
--- a/libs/geom/include/psemek/geom/vector.hpp
+++ b/libs/geom/include/psemek/geom/vector.hpp
@@ -9,6 +9,7 @@
 #include <type_traits>
 #include <stdexcept>
 #include <cmath>
+#include <compare>
 
 namespace psemek::geom
 {
@@ -97,6 +98,19 @@ namespace psemek::geom
 		return !(v1 < v2);
 	}
 
+	template <typename T, std::size_t N>
+	std::strong_ordering operator <=> (vector<T, N> const & v1, vector<T, N> const & v2)
+	{
+		for (std::size_t i = 0; i < N; ++i)
+		{
+			if (v1[i] < v2[i])
+				return std::strong_ordering::less;
+			if (v1[i] > v2[i])
+				return std::strong_ordering::greater;
+		}
+		return std::strong_ordering::equal;
+	}
+
 	template <typename T1, typename T, std::size_t N>
 	vector<T1, N> cast(vector<T, N> const & v)
 	{