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https://github.com/Alex-Rachel/TEngine.git
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Init TEngine4.0.0
Init TEngine4.0.0
This commit is contained in:
117
UnityProject/Packages/UniTask/Runtime/Linq/Intersect.cs
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117
UnityProject/Packages/UniTask/Runtime/Linq/Intersect.cs
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using Cysharp.Threading.Tasks.Internal;
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using System;
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using System.Collections.Generic;
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using System.Threading;
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namespace Cysharp.Threading.Tasks.Linq
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{
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public static partial class UniTaskAsyncEnumerable
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{
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public static IUniTaskAsyncEnumerable<TSource> Intersect<TSource>(this IUniTaskAsyncEnumerable<TSource> first, IUniTaskAsyncEnumerable<TSource> second)
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{
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Error.ThrowArgumentNullException(first, nameof(first));
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Error.ThrowArgumentNullException(second, nameof(second));
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return new Intersect<TSource>(first, second, EqualityComparer<TSource>.Default);
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}
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public static IUniTaskAsyncEnumerable<TSource> Intersect<TSource>(this IUniTaskAsyncEnumerable<TSource> first, IUniTaskAsyncEnumerable<TSource> second, IEqualityComparer<TSource> comparer)
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{
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Error.ThrowArgumentNullException(first, nameof(first));
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Error.ThrowArgumentNullException(second, nameof(second));
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Error.ThrowArgumentNullException(comparer, nameof(comparer));
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return new Intersect<TSource>(first, second, comparer);
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}
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}
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internal sealed class Intersect<TSource> : IUniTaskAsyncEnumerable<TSource>
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{
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readonly IUniTaskAsyncEnumerable<TSource> first;
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readonly IUniTaskAsyncEnumerable<TSource> second;
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readonly IEqualityComparer<TSource> comparer;
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public Intersect(IUniTaskAsyncEnumerable<TSource> first, IUniTaskAsyncEnumerable<TSource> second, IEqualityComparer<TSource> comparer)
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{
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this.first = first;
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this.second = second;
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this.comparer = comparer;
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}
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public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
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{
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return new _Intersect(first, second, comparer, cancellationToken);
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}
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class _Intersect : AsyncEnumeratorBase<TSource, TSource>
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{
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static Action<object> HashSetAsyncCoreDelegate = HashSetAsyncCore;
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readonly IEqualityComparer<TSource> comparer;
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readonly IUniTaskAsyncEnumerable<TSource> second;
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HashSet<TSource> set;
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UniTask<HashSet<TSource>>.Awaiter awaiter;
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public _Intersect(IUniTaskAsyncEnumerable<TSource> first, IUniTaskAsyncEnumerable<TSource> second, IEqualityComparer<TSource> comparer, CancellationToken cancellationToken)
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: base(first, cancellationToken)
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{
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this.second = second;
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this.comparer = comparer;
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}
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protected override bool OnFirstIteration()
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{
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if (set != null) return false;
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awaiter = second.ToHashSetAsync(cancellationToken).GetAwaiter();
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if (awaiter.IsCompleted)
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{
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set = awaiter.GetResult();
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SourceMoveNext();
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}
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else
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{
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awaiter.SourceOnCompleted(HashSetAsyncCoreDelegate, this);
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}
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return true;
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}
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static void HashSetAsyncCore(object state)
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{
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var self = (_Intersect)state;
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if (self.TryGetResult(self.awaiter, out var result))
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{
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self.set = result;
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self.SourceMoveNext();
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}
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}
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protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
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{
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if (sourceHasCurrent)
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{
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var v = SourceCurrent;
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if (set.Remove(v))
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{
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Current = v;
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result = true;
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return true;
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}
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else
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{
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result = default;
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return false;
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}
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}
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result = false;
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return true;
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}
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}
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}
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}
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