From d085c9a510c7c26d1e6e449702020baf198682b6 Mon Sep 17 00:00:00 2001
From: Kornei Dontsov <korneidontsov@gmail.com>
Date: Mon, 16 Jan 2023 17:18:50 +0300
Subject: [PATCH] [Unity3D-sdk] Remove null propagation for C# 4.0

Null propagation operator was released in C# 6.0. Older versions of Unity use C# 4.0 which doesn't have null propagation operator. This leads to errors like this:
`Assets/PocoSDK/PocoManager.cs(155,16): error CS1525: Unexpected symbol `.', expecting `[', or `identifier'`;
`<Assembly-CSharp>\Assets\PocoSDK\PocoManager.cs:5345 Feature 'null propagating operator' is not available. Please use language version 6.0 or greater.`

Documentation in README says that Poco-SDK supports Unity3D version 4 & 5 and above. To do this we should replace null propagation operator with the equivalent C# 4.0 code. This commit does it.
---
 Unity3D/PocoManager.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Unity3D/PocoManager.cs b/Unity3D/PocoManager.cs
index c2c46f8..01398f5 100644
--- a/Unity3D/PocoManager.cs
+++ b/Unity3D/PocoManager.cs
@@ -152,7 +152,11 @@ private object GetScreenSize(List<object> param)
     public void stopListening()
     {
         mRunning = false;
-        server?.Stop();
+        var server = this.server;
+        if (server != null)
+        {
+            server.Stop();
+        }
     }
 
     [RPC]