Re: Return object in QLXL

Posted by Ferdinando M. Ametrano-2 on
URL: http://quantlib.414.s1.nabble.com/Return-object-in-QLXL-tp8942p8945.html

Hi Peter

> What I do not manage is to export a member function in another object of
> type A which returns a shared_ptr to another type B.

here it is, namely a SwapRateHelper returning a shared_ptr<VanillaSwap> using its own SwapRateHelper::swap() method:

   VanillaSwap::VanillaSwap(
       const shared_ptr<ValueObject>& properties,
       const shared_ptr<QuantLib::SwapRateHelper>& swapRH,
       bool permanent)
   : Swap(properties, permanent)
   {
       libraryObject_ = swapRH->swap();
   }

and the wrapping code is auto-generated by the following xml:

    <Constructor name='qlVanillaSwapFromSwapRateHelper'>

      <libraryFunction>VanillaSwap</libraryFunction>

      <SupportedPlatforms>

        <SupportedPlatform name='Excel'/>

        <SupportedPlatform name='Cpp'/>

      </SupportedPlatforms>

      <ParameterList>

        <Parameters>

          <Parameter name='SwapRateHelper'>

            <type>QuantLib::SwapRateHelper</type>

            <tensorRank>scalar</tensorRank>

            <description>SwapRateHelper object ID.</description>

          </Parameter>

        </Parameters>

      </ParameterList>

    </Constructor>

The key point here is that even if in C++ swap() is just a method of SwapRateHelper returning shared_ptr<VanillaSwap>, in QLXL is used as "constructor" of a new Object wrapping the shared_ptr<VanillaSwap>

does this answer your question?

ciao -- Nando

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