Removing some of the elements from vibe.core.concurrency.Future[] futurelist

[kerdemdemir]

I am trying to make non blocking web requests to a web service.

vibe.core.concurrency.Future!(UserData)[] futurelist;

// I will make http requests in for loop and push them to 
futureList
foreach( elem; elemList )
{
         // In makeWebRequest I make the httprequest, parse json 
and push to my UserData
         auto future = vibe.core.concurrency.async( 
&elem.makeWebRequest );
         futurelist ~= future;
}


// I want to do call ProcessResponceData for each future which is 
ready.
while ( futurelist.length > 0 )
{
         futurelist.filter!(a => a.ready()).each!(a=> 
ProcessResponceData(a.getResult()));

         //!!!!!  Here is my problem
         //!!!!!  I want to remove the futures which are already 
processed.
         futurelist = futurelist.filter!(a => !a.ready()).array;	
         sleep(10.msecs);

}

I am having troubles while trying to remove the future which I 
already processed.

futurelist = futurelist.filter!(a => !a.ready()).array;	 results 
with:

/usr/local/bin/../import/std/array.d(2716,20): Error: can't have 
array of nothrow @safe void()
/usr/local/bin/../import/std/array.d(2782,46): Error: can't have 
array of inout nothrow @safe void()
/usr/local/bin/../import/std/array.d(3158,1): Error: template 
instance std.array.Appender!(Future!(UserData)[]) error 
instantiating
/usr/local/bin/../import/std/array.d(133,32):        instantiated 
from here: appender!(Future!(UserData)[])

futurelist = futurelist.filter!(a => !a.ready());	 results with:

  Error: cannot implicitly convert expression (filter(futurelist)) 
of type FilterResult!(__lambda5, Future!(UserData)[]) to 
Future!(AnalyzeData)[]

Do you have any suggestion or workaround for my case?
What lesson I should learn from this case? Do you guys have any 
idea why I am getting those compile errors?


Thanks
Erdem