From 18fa2868964f9b5f48628837a4630220ded8fa81 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sat, 23 Jan 2021 21:33:59 +0300
Subject: [PATCH] Add simplex comparison operators

---
 libs/geom/include/psemek/geom/simplex.hpp | 37 +++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/libs/geom/include/psemek/geom/simplex.hpp b/libs/geom/include/psemek/geom/simplex.hpp
index eafb48f5..072b0f07 100644
--- a/libs/geom/include/psemek/geom/simplex.hpp
+++ b/libs/geom/include/psemek/geom/simplex.hpp
@@ -4,6 +4,7 @@
 
 #include <iostream>
 #include <type_traits>
+#include <algorithm>
 
 namespace psemek::geom
 {
@@ -35,6 +36,42 @@ namespace psemek::geom
 	template <typename Point>
 	using triangle = simplex<Point, 2>;
 
+	template <typename P, std::size_t K>
+	bool operator == (simplex<P, K> const & s1, simplex<P, K> const & s2)
+	{
+		return std::equal(s1.points, s1.points + K + 1, s2.points);
+	}
+
+	template <typename P, std::size_t K>
+	bool operator != (simplex<P, K> const & s1, simplex<P, K> const & s2)
+	{
+		return !(s1 == s2);
+	}
+
+	template <typename P, std::size_t K>
+	bool operator < (simplex<P, K> const & s1, simplex<P, K> const & s2)
+	{
+		return std::lexicographical_compare(s1.points, s1.points + K + 1, s2.points, s2.points + K + 1);
+	}
+
+	template <typename P, std::size_t K>
+	bool operator > (simplex<P, K> const & s1, simplex<P, K> const & s2)
+	{
+		return s2 < s1;
+	}
+
+	template <typename P, std::size_t K>
+	bool operator <= (simplex<P, K> const & s1, simplex<P, K> const & s2)
+	{
+		return !(s2 < s1);
+	}
+
+	template <typename P, std::size_t K>
+	bool operator >= (simplex<P, K> const & s1, simplex<P, K> const & s2)
+	{
+		return !(s1 < s2);
+	}
+
 	template <typename Point, std::size_t K>
 	std::ostream & operator << (std::ostream & os, simplex<Point, K> const & s)
 	{