From 3156b4a832820d9bce7ccd32d6641d98ed2bdb14 Mon Sep 17 00:00:00 2001
From: Mike Seese <seesemichaelj@gmail.com>
Date: Mon, 2 Oct 2023 12:46:57 -0700
Subject: [PATCH] fix issue with std::result_of being removed in c++20 (#393)

---
 Source/SocketIOLib/SocketIOLib.Build.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Source/SocketIOLib/SocketIOLib.Build.cs b/Source/SocketIOLib/SocketIOLib.Build.cs
index eec6c8c..2835db1 100644
--- a/Source/SocketIOLib/SocketIOLib.Build.cs
+++ b/Source/SocketIOLib/SocketIOLib.Build.cs
@@ -72,6 +72,14 @@ public SocketIOLib(ReadOnlyTargetRules Target) : base(Target)
 				{
 					PublicDefinitions.Add("SIO_TLS=1");
 				}
+				
+				if (
+					(Target.Version.MajorVersion == 5 && Target.Version.MinorVersion >= 3) ||
+					Target.Version.MajorVersion > 5
+				)
+				{
+					PublicDefinitions.Add("ASIO_HAS_STD_INVOKE_RESULT=1");
+				}
 			}
 	}
 }