Aggregate<TSource, TAccumulate, TResult>
                
                    sealed class Aggregate<
TSource, 
TAccumulate, 
TResult> : 
Producer<
TResult, 
_<
TSource, 
TAccumulate, 
TResult>>
                
 
                
                
                
public Aggregate(
IObservable<
TSource> 
source, 
TAccumulate seed, 
Func<
TAccumulate, 
TSource, 
TAccumulate> 
accumulator, 
Func<
TAccumulate, 
TResult> 
resultSelector)