From 5a0b3927a33807cca4c77c40eb873f8a3b51b0b0 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 29 Apr 2023 19:07:11 +0100
Subject: Drop .hpp for header only things

Half of them acquired a .cpp part anyway
---
 lib/sorting.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 lib/sorting.h

(limited to 'lib/sorting.h')

diff --git a/lib/sorting.h b/lib/sorting.h
new file mode 100644
index 0000000..777de00
--- /dev/null
+++ b/lib/sorting.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include <glm/fwd.hpp>
+#include <type_traits>
+
+template<typename T> struct PtrSorter {
+	bool
+	operator()(const T & a, const T & b) const
+	{
+		return *a < *b;
+	}
+};
+
+template<typename T, auto M> struct PtrMemberSorter : public PtrSorter<T> {
+	using MT = std::decay_t<decltype((*T {}).*M)>;
+	using is_transparent = MT;
+
+	using PtrSorter<T>::operator();
+
+	bool
+	operator()(const MT & a, const T & b) const
+	{
+		return a < (*b).*M;
+	}
+
+	bool
+	operator()(const T & a, const MT & b) const
+	{
+		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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