SWIG Python - failure to register observer with observable

[aborodya]

Hi,
I've been trying to register an Observable of (in my case it is an ImpliedTermStructure object, let's say ts=ImpliedTermStructure(...) ) with an observer which I created as follows:
class MyObserver(Observable): ... (nothing special is going on there - just some attributes are being initialized and an update(self) method is being implemented.

When trying to do MyObserver.registerWith(ts) I'm getting an error:

TypeError: in method 'Observer__registerWith', argument 1 of type 'PyObserver *'


What am I missing here?

Thanks!

[Luigi Ballabio]

Do you have some code that reproduces the problem?

Luigi


On Thu, Jul 24, 2014 at 12:46 PM, aborodya <[hidden email]> wrote:

> Hi,
> I've been trying to register an Observable of (in my case it is an
> ImpliedTermStructure object, let's say ts=ImpliedTermStructure(...) ) with
> an observer which I created as follows:
> class MyObserver(Observable): ... (nothing special is going on there - just
> some attributes are being initialized and an update(self) method is being
> implemented.
>
> When trying to do MyObserver.registerWith(ts) I'm getting an error:
>
> TypeError: in method 'Observer__registerWith', argument 1 of type
> 'PyObserver *'
>
>
> What am I missing here?
>
> Thanks!
>
>
>
> --
> View this message in context: http://quantlib.10058.n7.nabble.com/SWIG-Python-failure-to-register-observer-with-observable-tp15650.html
> Sent from the quantlib-users mailing list archive at Nabble.com.
>
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--
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<https://twitter.com/lballabio>

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[aborodya]

Sorry, Luigi, didn't see you reply -

I was to reproduce the functionality of TermStructureTest::testImpliedObs() from the test suite.
So I defined a Flag class in Python

class Flag(Observer):
    def __init__(self):
        self.up_ = False
    def raiseFlag(self):
        self.up_ = True
    def lowerFlag(self):
        self.up_ = False
    def isUp(self):
        return self.up_
    def update(self):
        self.raiseFlag()


and created a function
def testImpliedObs(logger):

    vars = CommonVars()
   
    today = Settings.instance().evaluationDate
    newToday = today + Period(3,Years)
   
    newSettlement = vars.calendar.advance(newToday,
                                          vars.settlementDays, Days)
   
    h = RelinkableYieldTermStructureHandle()
    implied = ImpliedTermStructure(h, newSettlement)
    flag = Flag()
   
    flag.registerWith(implied)
    h.linkTo(vars.termStructure)


This gives me the error I mentioned earlier

Thanks,
Anatoly
   

[kbran]

Need to init the Observer

class Flag(Observer):
    def __init__(self):
        self.up_ = False
        Observer.__init__(self,
                                 self.update)


>>> flag = Flag()
>>> flag
<__main__.Flag; proxy of <Swig Object of type 'PyObserver *' at 0x02B44FB0> >

Now flag is of type PyObserver. Hope this helps