private static T Reduce(IEnumerable <T> source, int sign)
{
Func <Pair <bool, T>, T, Pair <bool, T> > intermediateReduce = AggregationMinMaxHelpers <T> .MakeIntermediateReduceFunction(sign);
Func <Pair <bool, T>, Pair <bool, T>, Pair <bool, T> > finalReduce = AggregationMinMaxHelpers <T> .MakeFinalReduceFunction(sign);
Func <Pair <bool, T>, T> resultSelector = AggregationMinMaxHelpers <T> .MakeResultSelectorFunction();
AssociativeAggregationOperator <T, Pair <bool, T>, T> @operator = new AssociativeAggregationOperator <T, Pair <bool, T>, T>(source, new Pair <bool, T>(false, default(T)), null, true, intermediateReduce, finalReduce, resultSelector, default(T) != null, QueryAggregationOptions.AssociativeCommutative);
return(@operator.Aggregate());
}
//-----------------------------------------------------------------------------------
// Helper method to find the minimum or maximum element in the source.
//
private static T Reduce(IEnumerable <T> source, int sign)
{
Contract.Assert(source != null);
Contract.Assert(sign == -1 || sign == 1);
Func <Pair <bool, T>, T, Pair <bool, T> > intermediateReduce = MakeIntermediateReduceFunction(sign);
Func <Pair <bool, T>, Pair <bool, T>, Pair <bool, T> > finalReduce = MakeFinalReduceFunction(sign);
Func <Pair <bool, T>, T> resultSelector = MakeResultSelectorFunction();
AssociativeAggregationOperator <T, Pair <bool, T>, T> aggregation =
new AssociativeAggregationOperator <T, Pair <bool, T>, T>(source, new Pair <bool, T>(false, default(T)), null,
true, intermediateReduce, finalReduce, resultSelector, default(T) != null, QueryAggregationOptions.AssociativeCommutative);
return(aggregation.Aggregate());
}