68 lines
1.5 KiB
C#
68 lines
1.5 KiB
C#
using System.Collections;
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using System.Diagnostics.Contracts;
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using System.Runtime.InteropServices;
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namespace Recyclable.Collections
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{
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public partial class RecyclableList<T> : IRecyclableVersionedList<T>
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{
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VersionedEnumerator IRecyclableVersionedList<T>.GetEnumerator() => new(this);
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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public struct VersionedEnumerator : IEnumerator<T>
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{
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private int _currentItemIndex;
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private readonly ulong _enumeratorVersion;
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private readonly RecyclableList<T> _list;
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#nullable disable
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[Pure]
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public readonly T Current => _enumeratorVersion == _list._version ? _list._memoryBlock[_currentItemIndex - 1] : throw new InvalidOperationException();
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[Pure]
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readonly object IEnumerator.Current => _enumeratorVersion == _list._version ? _list._memoryBlock[_currentItemIndex - 1] : throw new InvalidOperationException();
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#nullable restore
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public bool MoveNext()
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{
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if (_enumeratorVersion != _list._version)
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{
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throw new InvalidOperationException();
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}
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Contract.EndContractBlock();
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if (_currentItemIndex < _list._count)
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{
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_currentItemIndex++;
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return true;
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}
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return false;
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}
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public VersionedEnumerator(RecyclableList<T> list)
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{
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_currentItemIndex = 0;
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_list = list;
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_enumeratorVersion = list._version;
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}
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[Pure]
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public readonly void Dispose()
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{
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}
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void IEnumerator.Reset()
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{
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if (_enumeratorVersion != _list._version)
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{
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throw new InvalidOperationException();
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}
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_currentItemIndex = 0;
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}
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}
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}
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}
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