Init TEngine4.0.0

Init TEngine4.0.0

UnityProject/Packages/UniTask/Runtime/Linq/Skip.cs

@@ -0,0 +1,69 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<TSource> Skip<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Int32 count)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+
+            return new Skip<TSource>(source, count);
+        }
+    }
+
+    internal sealed class Skip<TSource> : IUniTaskAsyncEnumerable<TSource>
+    {
+        readonly IUniTaskAsyncEnumerable<TSource> source;
+        readonly int count;
+
+        public Skip(IUniTaskAsyncEnumerable<TSource> source, int count)
+        {
+            this.source = source;
+            this.count = count;
+        }
+
+        public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            return new _Skip(source, count, cancellationToken);
+        }
+
+        sealed class _Skip : AsyncEnumeratorBase<TSource, TSource>
+        {
+            readonly int count;
+
+            int index;
+
+            public _Skip(IUniTaskAsyncEnumerable<TSource> source, int count, CancellationToken cancellationToken)
+                : base(source, cancellationToken)
+            {
+                this.count = count;
+            }
+
+            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            {
+                if (sourceHasCurrent)
+                {
+                    if (count <= checked(index++))
+                    {
+                        Current = SourceCurrent;
+                        result = true;
+                        return true;
+                    }
+                    else
+                    {
+                        result = default;
+                        return false;
+                    }
+                }
+                else
+                {
+                    result = false;
+                    return true;
+                }
+            }
+        }
+    }
+}