XInt IFactorialFunction.Factorial(int n)
{
if (n < 0)
{
throw new System.ArgumentOutOfRangeException(
this.Name + ": " + nameof(n) + " >= 0 required, but was " + n);
}
if (n < 2)
{
return(XInt.One);
}
var log2N = XMath.FloorLog2(n);
ProductDelegate prodDelegate = Product;
var results = new IAsyncResult[log2N];
int high = n, low = n >> 1, shift = low, taskCounter = 0;
// -- It is more efficient to add the big intervals
// -- first and the small ones later!
while ((low + 1) < high)
{
results[taskCounter++] = prodDelegate.BeginInvoke(low + 1, high, null, null);
high = low;
low >>= 1;
shift += low;
}
XInt p = XInt.One, r = XInt.One;
while (--taskCounter >= 0)
{
var I = Task.Factory.StartNew(() => r * p);
var t = p * prodDelegate.EndInvoke(results[taskCounter]);
r = I.Result;
p = t;
}
return((r * p) << shift);
}
public Model_Invoke_Result(Invoke_Produce produce, AsyncCallback callback, object state)
: base(callback, state)
{
this.produce = produce;
//this.State=new List<string>();
//stateList = this.State as List<string>;
//Turn the expression into an array of bytes
produce.RunWork();
//string sta1 = "开始执行";
//stateList.Add(sta1);
ProductDelegate del = new ProductDelegate(produce.Product);
AsyncCallback callBack = new AsyncCallback(OnProduceComplete);
//string currentState = "kaishi";
IAsyncResult asyncResult = del.BeginInvoke(callBack, this);
if (!produce.Finish)
{
return;
}
base.Complete(produce.Result, true);
//begin writing asynchronously
//IAsyncResult result = fs.BeginWrite(bytes, 0, bytes.Length, new AsyncCallback(OnWrite), thi
}
