small touchups in UnmanagedMap dispose guards are missing

Author: Wayfarer

ExtendedSystemObjects/UnmanagedMap.cs

@@ -102,6 +102,11 @@ public UnmanagedMap(int capacityPowerOf2 = 8)
         /// </value>
         public int Capacity { get; private set; }
 
+        /// <summary>
+        /// The disposed
+        /// </summary>
+        private bool _disposed;
+
         /// <summary>
         /// Gets the keys.
         /// </summary>
@@ -163,8 +168,10 @@ private List<TValue> GetValuesSnapshot()
         /// </summary>
         public void Dispose()
         {
+            if (_disposed) return;
             Free();
             GC.SuppressFinalize(this);
+            _disposed = true;
         }
 
         /// <summary>
@@ -198,7 +205,7 @@ public void Set(int key, TValue value)
 
             for (var i = 0; i < Capacity; i++)
             {
-                // Triangular probing: offset = i*(i+1)/2
+                // linear probing
                 var idx = (hashIndex + i) & mask;
 
                 ref var slot = ref _entries[idx];
@@ -320,7 +327,7 @@ private int FindIndex(int key)
 
             for (var i = 0; i < Capacity; i++)
             {
-                // Triangular probing: offset = i*(i+1)/2
+                // linear probing
                 var idx = (startIndex + i) & mask;
 
                 ref var slot = ref _entries[idx];
@@ -419,7 +426,7 @@ private void InsertRaw(int key, TValue value)
 
             for (var i = 0; i < Capacity; i++)
             {
-                // Triangular probing: offset = i*(i+1)/2
+                // linear probing
                 var idx = (hashIndex + i) & mask;
 
                 if (_entries[idx].used == SharedResources.Empty)
@@ -432,6 +439,8 @@ private void InsertRaw(int key, TValue value)
                     return;
                 }
             }
+
+            throw new InvalidOperationException("InsertRaw failed during rehash.");
         }
 
         /// <summary>