From 9300a4b0ba649af225f6c005dbfe70aa9c9e8c0e Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 18 Dec 2022 12:42:23 +0000
Subject: Helper to sort glm::vecs by a specific axis

---
 lib/sorting.hpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'lib')

diff --git a/lib/sorting.hpp b/lib/sorting.hpp
index 0604aaf..777de00 100644
--- a/lib/sorting.hpp
+++ b/lib/sorting.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <glm/fwd.hpp>
 #include <type_traits>
 
 template<typename T> struct PtrSorter {
@@ -28,3 +29,21 @@ template<typename T, auto M> struct PtrMemberSorter : public PtrSorter<T> {
 		return (*a).*M < b;
 	}
 };
+
+struct CompareBy {
+	glm::length_t index;
+
+	template<typename T>
+	auto
+	operator()(const T & a, const T & b) const
+	{
+		return get(a) < get(b);
+	}
+
+	template<typename T>
+	auto
+	get(const T & a) const
+	{
+		return a[index];
+	}
+};
-- 
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