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Diffstat (limited to 'Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/Helpers.cs')
| -rw-r--r-- | Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/Helpers.cs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/Helpers.cs b/Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/Helpers.cs new file mode 100644 index 0000000..dee33fb --- /dev/null +++ b/Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/Helpers.cs @@ -0,0 +1,45 @@ +// 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.Observαble; + +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
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