| using Cysharp.Threading.Tasks.Internal; | 
| using System; | 
| using System.Collections.Generic; | 
| using System.Threading; | 
|   | 
| namespace Cysharp.Threading.Tasks.Linq | 
| { | 
|     public static partial class UniTaskAsyncEnumerable | 
|     { | 
|         public static UniTask<Boolean> ContainsAsync<TSource>(this IUniTaskAsyncEnumerable<TSource> source, TSource value, CancellationToken cancellationToken = default) | 
|         { | 
|             return ContainsAsync(source, value, EqualityComparer<TSource>.Default, cancellationToken); | 
|         } | 
|   | 
|         public static UniTask<Boolean> ContainsAsync<TSource>(this IUniTaskAsyncEnumerable<TSource> source, TSource value, IEqualityComparer<TSource> comparer, CancellationToken cancellationToken = default) | 
|         { | 
|             Error.ThrowArgumentNullException(source, nameof(source)); | 
|             Error.ThrowArgumentNullException(comparer, nameof(comparer)); | 
|   | 
|             return Contains.ContainsAsync(source, value, comparer, cancellationToken); | 
|         } | 
|     } | 
|   | 
|     internal static class Contains | 
|     { | 
|         internal static async UniTask<bool> ContainsAsync<TSource>(IUniTaskAsyncEnumerable<TSource> source, TSource value, IEqualityComparer<TSource> comparer, CancellationToken cancellationToken) | 
|         { | 
|             var e = source.GetAsyncEnumerator(cancellationToken); | 
|             try | 
|             { | 
|                 while (await e.MoveNextAsync()) | 
|                 { | 
|                     if (comparer.Equals(value, e.Current)) | 
|                     { | 
|                         return true; | 
|                     } | 
|                 } | 
|   | 
|                 return false; | 
|             } | 
|             finally | 
|             { | 
|                 if (e != null) | 
|                 { | 
|                     await e.DisposeAsync(); | 
|                 } | 
|             } | 
|         } | 
|     } | 
| } |