daily update on 20250210 by nitload youmu

内核源代码/StgSharp.Common/Collections/ReferencedSlicedCollection.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.Collections
+{
+    /// <summary>
+    /// Part of a collection. This contains a direct reference to origin collection,
+    /// so all change to origin collection will be reflected in this object.
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class ReferencedSlicedCollection<T> : ICollection<T>
+    {
+        private ICollection<T> _collection;
+        private int _begin;
+        private int _length;
+
+        internal ReferencedSlicedCollection()
+        {
+            _collection = Array.Empty<T>();
+            _begin = 0;
+            _length = 0;
+        }
+
+        public ReferencedSlicedCollection(ICollection<T> collection, int begin, int length)
+        {
+            ArgumentNullException.ThrowIfNull(collection);
+            ArgumentOutOfRangeException.ThrowIfLessThan(begin, 0);
+            ArgumentOutOfRangeException.ThrowIfLessThan(length, 0);
+            ArgumentOutOfRangeException.ThrowIfLessThan(begin + length, collection.Count);
+            _collection = collection;
+            _begin = begin;
+            _length = length;
+        }   
+
+        public int Count => _length;
+
+        public bool IsReadOnly => true;
+
+        void ICollection<T>.Add(T item)
+        {
+            throw new NotSupportedException();
+        }
+
+        public void Clear()
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Contains(T item)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void CopyTo(T[] array, int arrayIndex)
+        {
+            throw new NotImplementedException();
+        }
+
+        public IEnumerator<T> GetEnumerator()
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Remove(T item)
+        {
+            throw new NotImplementedException();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}