Enumerator.cs

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using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
 
namespace System.Diagnostics;
 
internal struct Enumerator<T> : IEnumerator<T>, IEnumerator, IDisposable
{
    private DiagNode<T> _nextNode;
 
    [AllowNull]
    [MaybeNull]
    private T _currentItem;
 
    public T Current => _currentItem;
 
    object IEnumerator.Current => Current;
 
    public Enumerator(DiagNode<T> head)
    {
        _nextNode = head;
        _currentItem = default(T);
    }
 
    public bool MoveNext()
    {
        if (_nextNode == null)
        {
            _currentItem = default(T);
            return false;
        }
        _currentItem = _nextNode.Value;
        _nextNode = _nextNode.Next;
        return true;
    }
 
    public void Reset()
    {
        throw new NotSupportedException();
    }
 
    public void Dispose()
    {
    }
}