public Stream <TIn, TIn> Fold <TIn> (Func <TOut, TIn, TIn> fn, TIn initAccValue)
{
var(Stream, Pusher) = FolderStream <TOut, TIn> .GetAccumulableStream(fn, initAccValue, this);
_streamer = Pusher;
return(Stream);
}
public Stream <double, double> Min(Func <TOut, double> fn)
{
Func <TOut, double, double> folder = ((x, acc) => { var nx = fn(x); return(nx < acc ? nx : acc); });
var(Stream, Pusher) = FolderStream <TOut, double> .GetAccumulableStream(folder, double.MaxValue, this);
_streamer = Pusher;
return(Stream);
}