125 【战斗】战斗系统

yyl

2025-08-25 214fe94eaf7f09741a7857775dfffe8c3b83c75c

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using Cysharp.Threading.Tasks.Internal;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
 
namespace Cysharp.Threading.Tasks.Linq
{
    public static partial class UniTaskAsyncEnumerable
    {
        public static IUniTaskAsyncEnumerable<TSource> Reverse<TSource>(this IUniTaskAsyncEnumerable<TSource> source)
        {
            Error.ThrowArgumentNullException(source, nameof(source));
            return new Reverse<TSource>(source);
        }
    }
 
    internal sealed class Reverse<TSource> : IUniTaskAsyncEnumerable<TSource>
    {
        readonly IUniTaskAsyncEnumerable<TSource> source;
 
        public Reverse(IUniTaskAsyncEnumerable<TSource> source)
        {
            this.source = source;
        }
 
        public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
        {
            return new _Reverse(source, cancellationToken);
        }
 
        sealed class _Reverse : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
        {
            readonly IUniTaskAsyncEnumerable<TSource> source;
            CancellationToken cancellationToken;
 
            TSource[] array;
            int index;
 
            public _Reverse(IUniTaskAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
            {
                this.source = source;
                this.cancellationToken = cancellationToken;
                TaskTracker.TrackActiveTask(this, 3);
            }
 
            public TSource Current { get; private set; }
 
            // after consumed array, don't use await so allow async(not require UniTaskCompletionSourceCore).
            public async UniTask<bool> MoveNextAsync()
            {
                cancellationToken.ThrowIfCancellationRequested();
 
                if (array == null)
                {
                    array = await source.ToArrayAsync(cancellationToken);
                    index = array.Length - 1;
                }
 
                if (index != -1)
                {
                    Current = array[index];
                    --index;
                    return true;
                }
                else
                {
                    return false;
                }
            }
 
            public UniTask DisposeAsync()
            {
                TaskTracker.RemoveTracking(this);
                return default;
            }
        }
    }
}