http://quantlib.414.s1.nabble.com/RelinkableHandle-YieldTermStructure-reset-to-Null-tp14597p14631.html
> Ok, I see. It's YieldTermStructure::update(), which gets called when
> the zero-spreaded curve is notified that the discount handle has
> changed and tries to calculate the new reference date. Except it
> can't, because the handle is empty.
>
> As a quick and dirty fix, wrap the "if" in
> YieldTermStructure::update() in a try/catch and just block the
> exception. But be aware that this could hide other problems, i.e.,
> actual exceptions in setJumps(). I'll try and commit a more robust
> patch in the repository.
>
> Luigi
>
>
> On Wed, Oct 23, 2013 at 11:13 PM, Breig, Dr. Christoph (IDS GmbH)
> <
[hidden email]> wrote:
>> Hi Luigi, hi all,
>> yes, here is it. Do you have an idea how to reset "discTermStructure" after the initialisation of "spreadedDiscTermStructure".
>> -------------------
>> #include <ql/quantlib.hpp>
>>
>> using namespace QuantLib;
>>
>> int main(int, char* []) {
>>
>> try {
>>
>> QuantLib::RelinkableHandle<QuantLib::YieldTermStructure> discTermStructure;
>> boost::shared_ptr<YieldTermStructure> nullYTSPtr;
>> Date evaluationDate = Date(23,Month(10),2013);
>> boost::shared_ptr<YieldTermStructure> yts(new FlatForward(evaluationDate, 0.02, ActualActual()));
>> discTermStructure.linkTo(yts);
>> boost::shared_ptr<Quote> spread(new SimpleQuote(0.02));
>>
>> // no problem
>> discTermStructure.linkTo(nullYTSPtr);
>> discTermStructure.linkTo(yts);
>>
>> // problem
>> boost::shared_ptr<YieldTermStructure> spreadedDiscTermStructure(new ZeroSpreadedTermStructure(discTermStructure,Handle<Quote>(spread)));
>> discTermStructure.linkTo(nullYTSPtr);
>>
>> system("PAUSE");
>> return 0;
>>
>> } catch (std::exception& e) {
>> std::cerr << e.what() << std::endl;
>> system("PAUSE");
>> return 1;
>> } catch (...) {
>> std::cerr << "unknown error" << std::endl;
>> system("PAUSE");
>> return 1;
>> }
>> }
>>
>> -------------
>>
>> Best and thx
>> Chris
>>
>> -----Ursprüngliche Nachricht-----
>> Von: Luigi Ballabio [mailto:
[hidden email]]
>> Gesendet: Mittwoch, 23. Oktober 2013 18:08
>> An: Breig, Dr. Christoph (IDS GmbH)
>> Cc: QuantLib developers
>> Betreff: Re: [Quantlib-dev] RelinkableHandle<YieldTermStructure> reset to Null
>>
>> It looks like the spreaded curve notifies its observers of the change,
>> one of them tries to perform some calculation as a consequence, and
>> the calculation fails because the handle is empty. Can you reproduce
>> the problem in a short program you can post?
>>
>> Luigi
>>
>>
>> On Wed, Oct 23, 2013 at 4:49 PM, Breig, Dr. Christoph (IDS GmbH)
>> <
[hidden email]> wrote:
>>> Hi Luigi, hi all
>>>
>>> the empty shared_ptr works fine for e.g. InterpolatedZeroCurves but not for
>>> ZeroSpreadedTermStructures. Then, while setting the empty shared_ptr,
>>> following error messages takes place:
>>> "could not notify one or more observers: empty Handle cannot be
>>> dereferenced"
>>>
>>> I'm at the moment using version 1.0 of QuantLib (in case the problem is a
>>> bug and was already fixed).
>>>
>>> Best and thanks
>>> Chris
>>>
>>> ________________________________
>>> Von: Luigi Ballabio [mailto:
[hidden email]]
>>> Gesendet: Freitag, 18. Oktober 2013 16:13
>>> An: Breig, Dr. Christoph (IDS GmbH)
>>> Cc: QuantLib developers
>>> Betreff: Re: [Quantlib-dev] RelinkableHandle<YieldTermStructure> reset to
>>> Null
>>>
>>> Hi,
>>> link it to an empty shared_ptr.
>>>
>>> Luigi
>>>
>>> On Oct 18, 2013 4:01 PM, "Breig, Dr. Christoph (IDS GmbH)"
>>> <
[hidden email]> wrote:
>>>>
>>>> Dear all,
>>>>
>>>> has anybody an idea how to set a Relinkable Handle who is already linked
>>>> to a YieldTermStructure object back to Null, so that the function
>>>> "empty()" returns again true?
>>>>
>>>> Best and thanks
>>>> Chris
>>>>
>>>>
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>>>
>>
>>
>>
>> --
>> <
https://implementingquantlib.blogspot.com>
>> <
https://twitter.com/lballabio>
>
>
>
> --
> <
https://implementingquantlib.blogspot.com>
> <
https://twitter.com/lballabio>
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