NullableIntSumAggregationOperator.cs

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using System.Collections.Generic;
using System.Threading;
 
namespace System.Linq.Parallel;
 
internal sealed class NullableIntSumAggregationOperator : InlinedAggregationOperator<int?, int?, int?>
{
    private sealed class NullableIntSumAggregationOperatorEnumerator<TKey> : InlinedAggregationOperatorEnumerator<int?>
    {
        private readonly QueryOperatorEnumerator<int?, TKey> _source;
 
        internal NullableIntSumAggregationOperatorEnumerator(QueryOperatorEnumerator<int?, TKey> source, int partitionIndex, CancellationToken cancellationToken)
            : base(partitionIndex, cancellationToken)
        {
            _source = source;
        }
 
        protected override bool MoveNextCore(ref int? currentElement)
        {
            int? currentElement2 = null;
            TKey currentKey = default(TKey);
            QueryOperatorEnumerator<int?, TKey> source = _source;
            if (source.MoveNext(ref currentElement2, ref currentKey))
            {
                int num = 0;
                int num2 = 0;
                do
                {
                    if ((num2++ & 0x3F) == 0)
                    {
                        _cancellationToken.ThrowIfCancellationRequested();
                    }
                    num = checked(num + currentElement2.GetValueOrDefault());
                }
                while (source.MoveNext(ref currentElement2, ref currentKey));
                currentElement = num;
                return true;
            }
            return false;
        }
 
        protected override void Dispose(bool disposing)
        {
            _source.Dispose();
        }
    }
 
    internal NullableIntSumAggregationOperator(IEnumerable<int?> child)
        : base(child)
    {
    }
 
    protected override int? InternalAggregate(ref Exception singularExceptionToThrow)
    {
        using IEnumerator<int?> enumerator = GetEnumerator(ParallelMergeOptions.FullyBuffered, suppressOrderPreservation: true);
        int num = 0;
        while (enumerator.MoveNext())
        {
            num = checked(num + enumerator.Current.GetValueOrDefault());
        }
        return num;
    }
 
    protected override QueryOperatorEnumerator<int?, int> CreateEnumerator<TKey>(int index, int count, QueryOperatorEnumerator<int?, TKey> source, object sharedData, CancellationToken cancellationToken)
    {
        return new NullableIntSumAggregationOperatorEnumerator<TKey>(source, index, cancellationToken);
    }
}