Observable.pairwise<'T> Function (F#)
Returns a new observable that triggers on the second and subsequent triggerings of the input observable. The Nth triggering of the input observable passes the arguments from the N-1th and Nth triggering as a pair. The argument passed to the N-1th triggering is held in hidden internal state until the Nth triggering occurs.
Namespace/Module Path: Microsoft.FSharp.Control.Observable
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Observable.pairwise : IObservable<'T> -> IObservable<'T * 'T>
// Usage:
Observable.pairwise source
Parameters
source
Type: IObservable<'T>The input observable.
Return Value
An observable that triggers on successive pairs of observations from the input observable.
Remarks
For each observer, the registered intermediate observing object is not thread safe. That is, observations arising from the source must not be triggered concurrently on different threads.
This function is named Pairwise in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Platforms
Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Version Information
F# Runtime
Supported in: 2.0, 4.0
Silverlight
Supported in: 3