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Christoph
Christoph

Reputation: 5612

Switch type based on boolean parameter (without inheriting)?

I have a model representing some chemical process, and I want the reaction model to be switchable between an absorption and a desorption class (which define the respective model), based on a boolean parameter. I tried to do it like this:

model Sorption
  boolean parameter absorbing;
  AbsorptionModel if absorbing else Desorptionmodel reaction;
equation
  reaction.T = T; //dummy usage
  ...

Use it like:

Sorption TestAbsorption(absorbing=true); // uses the absorption model
Sorption TestDesorption(absorbing=false); // uses the desorption model

Of course, this way does not work. absorbing is known at compile time, so I have a feeling it should be ok to achieve this somehow.

I tried to use replaceable, but I don't want to (unnecessarily) make two separate subclasses of Sorption just to switch the type of reaction model. It seems replaceable/redeclare is only useable when inheriting, but I may be wrong? Is there a way to do what I want?

AbsorptionModel and DesorptionModel both inherit from the same base class, and have identical interfaces, if that is relevant.

Upvotes: 4

Views: 184

Answers (1)

Adrian Pop
Adrian Pop

Reputation: 4231

No if is needed and you cannot use if with component declaration, except for conditional components (but that will only remove the component declaration and its connection equations).

model Sorption
  boolean parameter absorbing;
  replaceable model RModel = AbsorptionModel;
  RModel reaction;
equation
  reaction.T = T; //dummy usage
  ...

Use it like:

Sorption TestAbsorption(redeclare model RModel = AbsorptionModel); // uses the absorption model
Sorption TestDesorption(redeclare model RModel = Desorptionmodel); // uses the desorption model

Upvotes: 4

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