EmptyPartition.cs

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using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
 
namespace System.Linq;
 
[DebuggerDisplay("Count = 0")]
internal sealed class EmptyPartition<TElement> : IPartition<TElement>, IIListProvider<TElement>, IEnumerable<TElement>, IEnumerable, IEnumerator<TElement>, IEnumerator, IDisposable
{
    public static readonly IPartition<TElement> Instance = new EmptyPartition<TElement>();
 
    [ExcludeFromCodeCoverage(Justification = "Shouldn't be called, and as undefined can return or throw anything anyway")]
    public TElement Current => default(TElement);
 
    [ExcludeFromCodeCoverage(Justification = "Shouldn't be called, and as undefined can return or throw anything anyway")]
    object IEnumerator.Current => null;
 
    private EmptyPartition()
    {
    }
 
    public IEnumerator<TElement> GetEnumerator()
    {
        return this;
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return this;
    }
 
    public bool MoveNext()
    {
        return false;
    }
 
    void IEnumerator.Reset()
    {
    }
 
    void IDisposable.Dispose()
    {
    }
 
    public IPartition<TElement> Skip(int count)
    {
        return this;
    }
 
    public IPartition<TElement> Take(int count)
    {
        return this;
    }
 
    public TElement TryGetElementAt(int index, out bool found)
    {
        found = false;
        return default(TElement);
    }
 
    public TElement TryGetFirst(out bool found)
    {
        found = false;
        return default(TElement);
    }
 
    public TElement TryGetLast(out bool found)
    {
        found = false;
        return default(TElement);
    }
 
    public TElement[] ToArray()
    {
        return Array.Empty<TElement>();
    }
 
    public List<TElement> ToList()
    {
        return new List<TElement>();
    }
 
    public int GetCount(bool onlyIfCheap)
    {
        return 0;
    }
}