using System.Collections.Generic; namespace System.Collections.Frozen { internal sealed class DefaultFrozenSet<T> : ItemsFrozenSet<T, DefaultFrozenSet<T>.GSW> { internal struct GSW : IGenericSpecializedWrapper { private DefaultFrozenSet<T> _set; public int Count => _set.Count; public IEqualityComparer<T> Comparer => _set.Comparer; public void Store(FrozenSet<T> set) { _set = (DefaultFrozenSet<T>)set; } public int FindItemIndex(T item) { return _set.FindItemIndex(item); } public Enumerator GetEnumerator() { return _set.GetEnumerator(); } } internal DefaultFrozenSet(HashSet<T> source) : base(source, false) { } private protected override int FindItemIndex(T item) { IEqualityComparer<T> comparer = base.Comparer; int num = (item != null) ? comparer.GetHashCode(item) : 0; _hashTable.FindMatchingEntries(num, out int i, out int endIndex); for (; i <= endIndex; i++) { if (num == _hashTable.HashCodes[i] && comparer.Equals(item, _items[i])) return i; } return -1; } } }