45 lines
1.1 KiB
C#
45 lines
1.1 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
|
|
|
|
#if !NO_PERF
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Reactive.Linq.ObservableImpl;
|
|
|
|
namespace System.Reactive
|
|
{
|
|
internal static class Helpers
|
|
{
|
|
public static int? GetLength<T>(IEnumerable<T> source)
|
|
{
|
|
var array = source as T[];
|
|
if (array != null)
|
|
return array.Length;
|
|
|
|
var list = source as IList<T>;
|
|
if (list != null)
|
|
return list.Count;
|
|
|
|
return null;
|
|
}
|
|
|
|
public static IObservable<T> Unpack<T>(IObservable<T> source)
|
|
{
|
|
var hasOpt = default(bool);
|
|
|
|
do
|
|
{
|
|
hasOpt = false;
|
|
|
|
var eval = source as IEvaluatableObservable<T>;
|
|
if (eval != null)
|
|
{
|
|
source = eval.Eval();
|
|
hasOpt = true;
|
|
}
|
|
} while (hasOpt);
|
|
|
|
return source;
|
|
}
|
|
}
|
|
}
|
|
#endif |