42 lines
1.2 KiB
GDScript3
42 lines
1.2 KiB
GDScript3
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static func pairwise_() -> Callable:
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var pairwise = func(source : Observable) -> Observable:
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# """Partially applied pairwise operator.
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#
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# Returns a new observable that triggers on the second and
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# subsequent triggerings of the input observable. The Nth
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# triggering of the input observable passes the arguments from
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# the N-1th and Nth triggering as a pair. The argument passed to
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# the N-1th triggering is held in hidden internal state until the
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# Nth triggering occurs.
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#
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# Returns:
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# An observable that triggers on successive pairs of
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# observations from the input observable as an array.
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# """
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var subscribe = func(
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observer : ObserverBase,
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_scheduler : SchedulerBase = null
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) -> DisposableBase:
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var has_previous = RefValue.Set(false)
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var previous = RefValue.Null()
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var on_next = func(x):
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var pair = null
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if true:
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var __ = LockGuard.new(source.lock)
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if has_previous.v:
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pair = Tuple.new([previous.v, x])
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else:
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has_previous.v = true
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previous.v = x
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if pair != null:
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observer.on_next(pair)
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return source.subscribe(on_next, observer.on_error, observer.on_completed)
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return Observable.new(subscribe)
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return pairwise
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