http://quantlib.414.s1.nabble.com/calibrationhelper-and-inflation-calibration-tp17316p17319.html
> Hi Andre,
>
> I just looked up this change (see below), it was introduced in 1.4. I
> remember when many observable notifications were sent to calibration
> helpers, they could cause a high CPU usage due to many (unnecessary)
> black price computations that were done directly in the update()
> method before. That's the background.
>
> Would it be possible for you to post the complete code of your
> calibration helper implementation, then we can see how to adapt it to
> the new base class ?
>
> Regards
> Peter
>
> Commit 114b6781a13eae2a99ce89e13387409bc703d323
> Author: Luigi Ballabio <
[hidden email]>
> AuthorDate: Mon Apr 15 11:55:23 2013 +0000
> Precedes: QuantLib-v1.3 (76) Inherited CalibrationHelper from
> LazyObject (thanks to Peter Caspers).
>
>
>
>
> On 23 February 2016 at 16:11, André de Boer <
[hidden email]> wrote:
>> Hi,
>>
>> When moving to QuantLib version 1.7.1 we suddenly experience problems
>> with inflation calibration, error message: 'empty handle cannot be
>> dereferenced'.
>>
>> The class InflationCapHelper inherits from CalibrationHelper:
>>
>> class InflationCapHelper : public QuantLib::CalibrationHelper {
>> public:
>> InflationCapHelper(const QuantLib::Date& startDate,
>> QuantLib::CapFloor::Type type,
>> const QuantLib::Size& years,
>> const QuantLib::Period& intervalTime,
>> const boost::shared_ptr<QuantLib::InflationIndex>& index,
>> QuantLib::Rate strike,
>> const QuantLib::Period& forwardStart,
>> QuantLib::Real nominal,
>> double marketPrice);
>> virtual ~InflationCapHelper();
>> virtual void addTimesTo(std::list<QuantLib::Time>& times) const;
>> virtual QuantLib::Real modelValue() const;
>> virtual QuantLib::Real blackPrice(QuantLib::Volatility volatility) const;
>> private:
>> boost::shared_ptr<InflationCapFloor> inflationDerivative_;
>> };
>>
>> Compared to earlier versions of QuantLib we see that
>> calibrationhelper.hpp has changed and inherits now from lazyobject in
>> stead from observer and observable.
>>
>> How to overcome this issue?
>>
>> Thnx,
>> André
>>
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