How to return UNDEFINED

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How to return UNDEFINED

Postby jrdp » 25 May 2023, 15:48

In the specification of the GetPresentPhases() method of the ICapeThermoMaterial interface for example, it is stated that the output parameters shall be returned as "UNDEFINED". Now I am unsure how to do this.
In the header file Cobia_UndefinedValues.h, there is the line
Code: Select all
#define CapeStringUndefined (COBIA::ConstCapeEmptyString{})

but as I am not a programmer by trade, I am not sure if and how to use it.
In any case, I would greatly appreciate any tips on how to correctly return "UNDEFINED" as per the COBIA specification.

Regards,
Philip
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Re: How to return UNDEFINED

Postby jasper » 26 May 2023, 13:10

The definition you see is for passing as input argument. As output argument - I suppose the easiest it so call .clear() on the passed output argument itself - UNDEFINED for a string value equals an empty string.
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Re: How to return UNDEFINED

Postby jasper » 26 May 2023, 13:11

What is the context in which you are returning UNDEFINED? Which function is it?
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Re: How to return UNDEFINED

Postby jrdp » 30 May 2023, 13:41

This question arose whilst working on implementing the GetPresentPhases function of the ICapeThermoMaterial interface. The overall context is implementing a Modelica-CAPE-OPEN interface for Dymola.
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Re: How to return UNDEFINED

Postby jrdp » 30 May 2023, 16:15

Regarding this particular function, GetPresentPhases, its parameters are CapeArrayString and CapeArrayEnumeration<CAPEOPEN_1_2::CapePhaseStatus>, so there is no clear()-function available. Would a resize(0) on the output parameters comply with the specification of the function?
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