From a4d0f2013d4ea0c9290c99b4a756c94da0800f51 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Wed, 29 Jan 2025 12:20:27 +0100
Subject: [PATCH] Add a std::span implementation for old platforms

---
 .gitmodules               |  6 ++++++
 include/lol/3rdparty/span |  1 +
 include/lol/std/span      | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)
 create mode 160000 include/lol/3rdparty/span
 create mode 100644 include/lol/std/span

diff --git a/.gitmodules b/.gitmodules
index 7c726ab1..4be492fa 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -38,6 +38,12 @@
 	branch = master
 	update = checkout
 
+[submodule "span"]
+	path = include/lol/3rdparty/span
+	url = https://github.com/tcbrindle/span
+	branch = master
+	update = checkout
+
 [submodule "doctest"]
 	path = include/lol/3rdparty/doctest
 	url = https://github.com/doctest/doctest
diff --git a/include/lol/3rdparty/span b/include/lol/3rdparty/span
new file mode 160000
index 00000000..836dc6a0
--- /dev/null
+++ b/include/lol/3rdparty/span
@@ -0,0 +1 @@
+Subproject commit 836dc6a0efd9849cb194e88e4aa2387436bb079b
diff --git a/include/lol/std/span b/include/lol/std/span
new file mode 100644
index 00000000..e677a5df
--- /dev/null
+++ b/include/lol/std/span
@@ -0,0 +1,37 @@
+//
+//  Lol Engine
+//
+//  Copyright © 2010–2025 Sam Hocevar <sam@hocevar.net>
+//
+//  Lol Engine is free software. It comes without any warranty, to
+//  the extent permitted by applicable law. You can redistribute it
+//  and/or modify it under the terms of the Do What the Fuck You Want
+//  to Public License, Version 2, as published by the WTFPL Task Force.
+//  See http://www.wtfpl.net/ for more details.
+//
+
+#pragma once
+
+// Assume std::span is available, then check for exceptions
+#define LOL_HAS_STD_SPAN 1
+
+#if !defined __SCE__
+#   include <version> // Provide __cpp_lib_span if relevant
+#   if !defined __cpp_lib_span
+#       undef LOL_HAS_STD_SPAN
+#   endif
+#endif
+
+#if defined __SCE__ // SCE platforms do not have <version>, so check for C++20 support
+#   if !_HAS_CXX20
+#       undef LOL_HAS_STD_SPAN
+#   endif
+#endif
+
+// Include <span> if everything went well, otherwise use the 3rd party implementation
+#if defined LOL_HAS_STD_SPAN
+#   include <span>
+#else
+#   define TCB_SPAN_NAMESPACE_NAME std
+#   include "../3rdparty/span/include/tcb/span.hpp"
+#endif