HashLookupValueList.cs

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namespace System.Linq.Parallel;
 
internal struct HashLookupValueList<TElement, TOrderKey>
{
    private readonly Pair<TElement, TOrderKey> _head;
 
    private ListChunk<Pair<TElement, TOrderKey>> _tail;
 
    internal Pair<TElement, TOrderKey> Head => _head;
 
    internal ListChunk<Pair<TElement, TOrderKey>> Tail => _tail;
 
    internal HashLookupValueList(TElement firstValue, TOrderKey firstOrderKey)
    {
        _head = CreatePair(firstValue, firstOrderKey);
        _tail = null;
    }
 
    internal bool Add(TElement value, TOrderKey orderKey)
    {
        bool flag = _tail == null;
        if (flag)
        {
            _tail = new ListChunk<Pair<TElement, TOrderKey>>(2);
        }
        _tail.Add(CreatePair(value, orderKey));
        return flag;
    }
 
    private static Pair<TElement, TOrderKey> CreatePair(TElement value, TOrderKey orderKey)
    {
        return new Pair<TElement, TOrderKey>(value, orderKey);
    }
}