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Assets/Mirror/Transports/FizzySteamworks/BidirectionalDictionary.cs

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+using System.Collections;
+using System.Collections.Generic;
+
+namespace Mirror.FizzySteam
+{
+    public class BidirectionalDictionary<T1, T2> : IEnumerable
+    {
+        private Dictionary<T1, T2> t1ToT2Dict = new Dictionary<T1, T2>();
+        private Dictionary<T2, T1> t2ToT1Dict = new Dictionary<T2, T1>();
+
+        public IEnumerable<T1> FirstTypes => t1ToT2Dict.Keys;
+        public IEnumerable<T2> SecondTypes => t2ToT1Dict.Keys;
+
+        public IEnumerator GetEnumerator() => t1ToT2Dict.GetEnumerator();
+
+        public int Count => t1ToT2Dict.Count;
+
+        public void Add(T1 key, T2 value)
+        {
+            if (t1ToT2Dict.ContainsKey(key))
+            {
+                Remove(key);
+            }
+
+            t1ToT2Dict[key] = value;
+            t2ToT1Dict[value] = key;
+        }
+
+        public void Add(T2 key, T1 value)
+        {
+            if (t2ToT1Dict.ContainsKey(key))
+            {
+                Remove(key);
+            }
+
+            t2ToT1Dict[key] = value;
+            t1ToT2Dict[value] = key;
+        }
+
+        public T2 Get(T1 key) => t1ToT2Dict[key];
+
+        public T1 Get(T2 key) => t2ToT1Dict[key];
+
+        public bool TryGetValue(T1 key, out T2 value) => t1ToT2Dict.TryGetValue(key, out value);
+
+        public bool TryGetValue(T2 key, out T1 value) => t2ToT1Dict.TryGetValue(key, out value);
+
+        public bool Contains(T1 key) => t1ToT2Dict.ContainsKey(key);
+
+        public bool Contains(T2 key) => t2ToT1Dict.ContainsKey(key);
+
+        public void Remove(T1 key)
+        {
+            if (Contains(key))
+            {
+                T2 val = t1ToT2Dict[key];
+                t1ToT2Dict.Remove(key);
+                t2ToT1Dict.Remove(val);
+            }
+        }
+        public void Remove(T2 key)
+        {
+            if (Contains(key))
+            {
+                T1 val = t2ToT1Dict[key];
+                t1ToT2Dict.Remove(val);
+                t2ToT1Dict.Remove(key);
+            }
+        }
+
+        public T1 this[T2 key]
+        {
+            get => t2ToT1Dict[key];
+            set
+            {
+                Add(key, value);
+            }
+        }
+
+        public T2 this[T1 key]
+        {
+            get => t1ToT2Dict[key];
+            set
+            {
+                Add(key, value);
+            }
+        }
+    }
+}