plString Hash for unordered containers

Sources/Plasma/CoreLib/plString.h

@@ -598,6 +598,35 @@ public:
     static plString Fill(size_t count, char c);
 
 public:
+    /** Functor that hashes a string for unordered containers.
+     *  \note The hash is case sensitive.
+     */
+    struct hash
+    {
+        size_t operator()(const plString& str) const
+        {
+            uint32_t hash = 0;
+            for (size_t i = 0; i < str.GetSize(); ++i) {
+                hash += str.CharAt(i);
+                hash += (hash << 10);
+                hash ^= (hash >> 6);
+            }
+            hash += (hash << 3);
+            hash ^= (hash >> 11);
+            hash += (hash << 15);
+            return hash;
+        }
+    };
+
+    /** Functor that hashes a string for unordered containers.
+     * \remarks This returns the hash of the lower-case variant of the string.
+     */
+    struct hash_i : hash
+    {
+        size_t operator()(const plString& str) const
+        { return hash::operator()(str.ToLower()); }
+    };
+
     /** Functor which compares two strings case-insensitively for sorting. */
     struct less_i
     {