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POChaining methods of ATL/COM objects
 

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    <p>In c++ we can easily set up method chaining in a class by designing methods returning *this. Would this be possible in an ATL/COM setting ? Let's say I have a simple ATL class MyOBj. I would like to know if chaining is possible in this context, and if so, what would be the idl signature of the method that would support chaining ? Simple examples would be appreciated ! (In fact, my methods are called from VBA for excel, and I would like to have chaining in that VBA context, as we have chaining already for standard VBA methods.)</p> <p>Thx a lot</p> <p>R</p> <p>EDIT :</p> <p>In the .idl file I have this :</p> <pre><code>interface IRateModel : IDispatch{ [id(1), helpstring("SETRATEMODEL")] HRESULT SETRATEMODEL( [in] VARIANT * var_in ) ; [id(2), helpstring("GETRATETERMSTRUCTURE")] HRESULT GETRATETERMSTRUCTURE( [in, out] VARIANT * var_in ) ; }; interface IVolatilityModel : IDispatch{ [id(1), helpstring("SETVOLATILITYMODEL")] HRESULT SETVOLATILITYMODEL( [in] VARIANT * var_in ) ; [id(2), helpstring("GETVOLATILITY")] HRESULT GETVOLATILITY( [in, out] VARIANT * var_in ) ; }; interface IMyOption : IDispatch{ [id(1), helpstring("SETMATURITY")] HRESULT SETMATURITY( [in] VARIANT * TheMaturity, [out,retval] IMyOption ** ret ) ; [id(2), helpstring("SETSTRIKE")] HRESULT SETSTRIKE( [in] VARIANT * TheStrike, [out,retval] IMyOption ** ret ) ; [id(3), helpstring("SETPAYOFF")] HRESULT SETPAYOFF( [in] VARIANT * ThePayoff, [out,retval] IMyOption ** ret ) ; [id(4), helpstring("ATTACHRATEMODEL")] HRESULT ATTACHRATEMODEL( [in] IRateModel ** TheRateModel, [out,retval] IMyOption ** ret ) ; [id(5), helpstring("ATTACHVOLATILITYPROCESS")] HRESULT ATTACHVOLATILITYPROCESS( [in] IVolatilityModel ** TheVolatilityModel, [out,retval] IMyOption ** ret ) ; [id(6), helpstring("PRICEIT")] HRESULT PRICEIT( [in, out] DOUBLE * price ) ; }; </code></pre> <p>SETRATEMODEL's implementation is :</p> <pre><code>STDMETHODIMP CRateModel::SETRATEMODEL( /*[in]*/ VARIANT * var_in ) { // something // ... return S_OK ; } </code></pre> <p>This implementation hasn't changed since I added other interface. Before adding them, at debug, the VARIANT was as VT_R8 (coming from a vba VARIANT, this one coming from an excel's double) Now at debug, the variant is a VT_DISPATCH.</p> <p>PS : I'm a very fresh-starter in ATL/COM.</p>
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