From e29b7cbafdf5a4d62ac8b9ac4e838c3dc8fa4e89 Mon Sep 17 00:00:00 2001
From: Simon G <simon.gockner@gmail.com>
Date: Fri, 13 Nov 2020 16:58:29 +0100
Subject: [PATCH] - add GBaseKey class that is only settable once

---
 GBase/GBaseKey.cs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 GBase/GBaseKey.cs

diff --git a/GBase/GBaseKey.cs b/GBase/GBaseKey.cs
new file mode 100644
index 0000000..00ab036
--- /dev/null
+++ b/GBase/GBaseKey.cs
@@ -0,0 +1,30 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase
+{
+    public class GBaseKey
+    {
+        private int _key = -1;
+        private bool _isSet;
+
+        public int Key
+        {
+            get => _key;
+            internal set
+            {
+                if (_isSet)
+                    throw new InvalidOperationException("Key is already set.");
+
+                _key = value;
+                _isSet = true;
+            }
+        }
+
+        public override string ToString() => $"{Key}";
+        public static implicit operator int(GBaseKey key) => key.Key;
+    }
+}
\ No newline at end of file