mpl going on good process

2025-09-24 20:38:15 +08:00
parent 8abc82ae08
commit 0cafe9fd4d
15 changed files with 179 additions and 104 deletions
@@ -0,0 +1,70 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace StgSharp.Collections
+{
+    public sealed class NotEnumerableList<T>(int capacity = 4)
+    {
+
+        private T[] _items = new T[capacity];
+        private int _size = 0;
+
+        public T this[int index]
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => (uint)index >= (uint)_size ? throw new ArgumentOutOfRangeException(nameof(index)) : _items[index];
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            set
+            {
+                if ((uint)index >= (uint)_size) {
+                    throw new ArgumentOutOfRangeException(nameof(index));
+                }
+
+                _items[index] = value;
+            }
+        }
+
+        public int Count => _size;
+
+        public int Capacity => _items.Length;
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Add(T item)
+        {
+            if (_size == _items.Length) {
+                EnsureCapacity(_size + 1);
+            }
+
+            _items[_size++] = item;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public Span<T> AsSpan()
+        {
+            return new Span<T>(_items, 0, _size);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void FastClear()
+        {
+            // 只重置size，不清理数组内容
+            _size = 0;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void EnsureCapacity(int min)
+        {
+            if (_items.Length < min)
+            {
+                int newCapacity = _items.Length == 0 ? 4 : _items.Length * 2;
+                if (newCapacity < min) {
+                    newCapacity = min;
+                }
+
+                Array.Resize(ref _items, newCapacity);
+            }
+        }
+
+    }
+}
+