From 64948b6840032b04ef00bfe207baa29dd445d141 Mon Sep 17 00:00:00 2001
From: Alexey Rusakov <Kitsune-Ral@users.sf.net>
Date: Thu, 7 Jul 2022 18:32:48 +0200
Subject: Avoid std::derived_from and std::bind_front

Apple Clang doesn't have those yet.
---
 lib/events/event.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/events/event.h')

diff --git a/lib/events/event.h b/lib/events/event.h
index a966e613..05eb51e9 100644
--- a/lib/events/event.h
+++ b/lib/events/event.h
@@ -344,7 +344,7 @@ inline auto eventCast(const BasePtrT& eptr)
 namespace _impl {
     template <typename FnT, class BaseT>
     concept Invocable_With_Downcast =
-        std::derived_from<std::remove_cvref_t<fn_arg_t<FnT>>, BaseT>;
+        std::is_base_of_v<BaseT, std::remove_cvref_t<fn_arg_t<FnT>>>;
 }
 
 template <class BaseT, typename TailT>
-- 
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