public async override Task <LeafNode> BestNodeAsync(Tournament <T> tournament, IAsyncComparator <T> comparator, CancellationToken cancellationToken)
{
if (BestCompetitor == null)
{
Debug.Assert(tournament.NextWinnerStepsMax > 0);
Debug.Assert(tournament.NextWinnerStepsMax - tournament.NextWinnerStepsDone > 0);
cancellationToken.ThrowIfCancellationRequested();
T itemA = (await CompetitorA.BestNodeAsync(tournament, comparator, cancellationToken)).Item;
cancellationToken.ThrowIfCancellationRequested();
T itemB = (await CompetitorB.BestNodeAsync(tournament, comparator, cancellationToken)).Item;
cancellationToken.ThrowIfCancellationRequested();
BestCompetitor = (await comparator.CompareAsync(itemA, itemB, cancellationToken)) > 0 ? CompetitorA : CompetitorB;
tournament.NextWinnerStepsDone++;
Debug.Assert(tournament.NextWinnerStepsDone <= tournament.NextWinnerStepsMax);
tournament.GlobalStepsDone++;
Debug.Assert(tournament.GlobalStepsDone <= tournament.GlobalStepsMax);
}
return(await BestCompetitor.BestNodeAsync(tournament, comparator, cancellationToken));
}
