98 lines
3.3 KiB
C#
98 lines
3.3 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="NotEnumerableList"
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// Project: StgSharp
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// AuthorGroup: Nitload
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// Copyright (c) Nitload. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Runtime.CompilerServices;
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namespace StgSharp.Collections
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{
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public sealed class NotEnumerableList<T>(int capacity = 4)
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{
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private T[] _items = new T[capacity];
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private int _size = 0;
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public T this[int index]
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => (uint)index >= (uint)_size ? throw new ArgumentOutOfRangeException(nameof(index)) : _items[index];
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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set
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{
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if ((uint)index >= (uint)_size) {
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throw new ArgumentOutOfRangeException(nameof(index));
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}
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_items[index] = value;
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}
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}
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public int Count => _size;
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public int Capacity => _items.Length;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public void Add(T item)
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{
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if (_size == _items.Length) {
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EnsureCapacity(_size + 1);
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}
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_items[_size++] = item;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public Span<T> AsSpan()
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{
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return new Span<T>(_items, 0, _size);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public void FastClear()
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{
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// 只重置size，不清理数组内容
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_size = 0;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private void EnsureCapacity(int min)
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{
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if (_items.Length < min)
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{
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int newCapacity = _items.Length == 0 ? 4 : _items.Length * 2;
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if (newCapacity < min) {
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newCapacity = min;
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}
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Array.Resize(ref _items, newCapacity);
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}
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}
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}
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}
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