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Assets/Oculus/Interaction/Runtime/Scripts/Extensions/HashSetExtensions.cs

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * Licensed under the Oculus SDK License Agreement (the "License");
+ * you may not use the Oculus SDK except in compliance with the License,
+ * which is provided at the time of installation or download, or which
+ * otherwise accompanies this software in either electronic or hard copy form.
+ *
+ * You may obtain a copy of the License at
+ *
+ * https://developer.oculus.com/licenses/oculussdk/
+ *
+ * Unless required by applicable law or agreed to in writing, the Oculus SDK
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using System.Collections.Generic;
+
+namespace Oculus.Interaction
+{
+    /// <summary>
+    /// Non-allocating HashSet extension methods mirroring MS implementation
+    /// https://referencesource.microsoft.com/#system.core/system/Collections/Generic/HashSet.cs
+    /// </summary>
+    public static class HashSetExtensions
+    {
+        /// <summary>
+        /// Take the union of this HashSet with other. Modifies this set.
+        /// </summary>
+        /// <param name="other">HashSet with items to add</param>
+        public static void UnionWithNonAlloc<T>(this HashSet<T> hashSetToModify, HashSet<T> other)
+        {
+            if (hashSetToModify == null)
+            {
+                throw new ArgumentNullException(nameof(hashSetToModify));
+            }
+            if (other == null)
+            {
+                throw new ArgumentNullException(nameof(other));
+            }
+            foreach (T item in other)
+            {
+                hashSetToModify.Add(item);
+            }
+        }
+
+        /// <summary>
+        /// Take the union of this HashSet with other. Modifies this set.
+        /// </summary>
+        /// <param name="other">IList with items to add</param>
+        public static void UnionWithNonAlloc<T>(this HashSet<T> hashSetToModify, IList<T> other)
+        {
+            if (hashSetToModify == null)
+            {
+                throw new ArgumentNullException(nameof(hashSetToModify));
+            }
+            if (other == null)
+            {
+                throw new ArgumentNullException(nameof(other));
+            }
+            for (int i = 0; i < other.Count; ++i)
+            {
+                hashSetToModify.Add(other[i]);
+            }
+        }
+
+        /// <summary>
+        /// Remove items in other from this set. Modifies this set
+        /// </summary>
+        /// <param name="other">HashSet with items to remove</param>
+        public static void ExceptWithNonAlloc<T>(this HashSet<T> hashSetToModify, HashSet<T> other)
+        {
+            if (hashSetToModify == null)
+            {
+                throw new ArgumentNullException(nameof(hashSetToModify));
+            }
+            if (other == null)
+            {
+                throw new ArgumentNullException(nameof(other));
+            }
+            if (hashSetToModify.Count == 0)
+            {
+                return;
+            }
+            if (other == hashSetToModify)
+            {
+                hashSetToModify.Clear();
+                return;
+            }
+            foreach (T element in other)
+            {
+                hashSetToModify.Remove(element);
+            }
+        }
+
+        /// <summary>
+        /// Remove items in other from this set. Modifies this set
+        /// </summary>
+        /// <param name="other">IList with items to remove</param>
+        public static void ExceptWithNonAlloc<T>(this HashSet<T> hashSetToModify, IList<T> other)
+        {
+            if (hashSetToModify == null)
+            {
+                throw new ArgumentNullException(nameof(hashSetToModify));
+            }
+            if (other == null)
+            {
+                throw new ArgumentNullException(nameof(other));
+            }
+            if (hashSetToModify.Count == 0)
+            {
+                return;
+            }
+            for (int i = 0; i < other.Count; ++i)
+            {
+                hashSetToModify.Remove(other[i]);
+            }
+        }
+
+        /// <summary>
+        /// Checks if this set overlaps other (i.e. they share at least one item)
+        /// </summary>
+        /// <param name="other">HashSet to check overlap against</param>
+        /// <returns>true if these have at least one common element; false if disjoint</returns>
+        public static bool OverlapsNonAlloc<T>(this HashSet<T> hashSetToCheck, HashSet<T> other)
+        {
+            if (hashSetToCheck == null)
+            {
+                throw new ArgumentNullException(nameof(hashSetToCheck));
+            }
+            if (other == null)
+            {
+                throw new ArgumentNullException(nameof(other));
+            }
+            if (hashSetToCheck.Count == 0)
+            {
+                return false;
+            }
+            foreach (T element in other)
+            {
+                if (hashSetToCheck.Contains(element))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// Checks if this set overlaps other (i.e. they share at least one item)
+        /// </summary>
+        /// <param name="other">IList to check overlap against</param>
+        /// <returns>true if these have at least one common element; false if disjoint</returns>
+        public static bool OverlapsNonAlloc<T>(this HashSet<T> hashSetToCheck, IList<T> other)
+        {
+            if (hashSetToCheck == null)
+            {
+                throw new ArgumentNullException(nameof(hashSetToCheck));
+            }
+            if (other == null)
+            {
+                throw new ArgumentNullException(nameof(other));
+            }
+            if (hashSetToCheck.Count == 0)
+            {
+                return false;
+            }
+            for (int i = 0; i < other.Count; ++i)
+            {
+                if (hashSetToCheck.Contains(other[i]))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+}