Buffer.cs

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using System.Collections.Generic;
 
namespace System.Linq;
 
internal readonly struct Buffer<TElement>
{
    internal readonly TElement[] _items;
 
    internal readonly int _count;
 
    internal Buffer(IEnumerable<TElement> source)
    {
        if (source is IIListProvider<TElement> iIListProvider)
        {
            _count = (_items = iIListProvider.ToArray()).Length;
        }
        else
        {
            _items = System.Collections.Generic.EnumerableHelpers.ToArray(source, out _count);
        }
    }
}