Utility structs for scoped usage of pooled List<T>, HashSet<T>, and Dictionary<TKey, TValue> in Unity. Automatically releases the collection back to the pool on disposal, enabling efficient memory reuse with using statements.

CollectionPoolScope

    public readonly struct ListPoolScope<T> : IDisposable
    {
        public readonly List<T> list;

        private ListPoolScope(List<T> list)
        {
            this.list = list;
        }

        public static ListPoolScope<T> Rent()
        {
            return new ListPoolScope<T>(ListPool<T>.Get());
        }

        public void Dispose()
        {
            ListPool<T>.Release(list);
        }
    }
    
    public readonly struct HashSetPoolScope<T> : IDisposable
    {
        public readonly HashSet<T> hashSet;

        private HashSetPoolScope(HashSet<T> hashSet)
        {
            this.hashSet = hashSet;
        }

        public static HashSetPoolScope<T> Rent()
        {
            return new HashSetPoolScope<T>(HashSetPool<T>.Get());
        }

        public void Dispose()
        {
            HashSetPool<T>.Release(hashSet);
        }
    }

    public readonly struct DictionaryPoolScope<TKey, TValue> : IDisposable
    {
        public readonly Dictionary<TKey, TValue> dictionary;

        private DictionaryPoolScope(Dictionary<TKey, TValue> dictionary)
        {
            this.dictionary = dictionary;
        }

        public static DictionaryPoolScope<TKey, TValue> Rent()
        {
            return new DictionaryPoolScope<TKey, TValue>(DictionaryPool<TKey, TValue>.Get());
        }
        
        public void Dispose()
        {
            DictionaryPool<TKey, TValue>.Release(dictionary);
        }
    }