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optional input for 'record'

#7909  Permalink Top

optional input for 'record'

Jun-21-17 17:35:53

Hey all,

So I am implementing a caching mechanism. Modelica does not have global variable so I need to pass this cache around. However, I want this cache input to be optional in a function, like

function tempFunc
   input Cache cache = NULL;
end tempFunc;

But Modelica does not have NULL. Any suggestion? Thank you!

#7910  Permalink Top

Re: optional input for 'record'

Jun-21-17 18:09:21

Can you use external objects for this?

#7911  Permalink Top

Re: optional input for 'record'

Jun-21-17 18:36:35

Thank you! I saw External Object before but thought it were some kind of interface between Modelica and C. I did not know that ExternalObject can act as a global variable in Modelica.

#7969  Permalink Top

Re: optional input for 'record'

Jul-14-17 12:36:54

Actually, ExternalObject does not help. For example, in the following code, I want to call test(5) with no input for 'obj' but what should be the default value for the 'obj'?

Code:


function test

   input Integer N;

   input ExtObj obj = ???;

algorithm

end test;



class TestModel

algorithm

    test(5)

end TestModel;

Edited by: cvan - Jul-14-17 12:37:34
#7971  Permalink Top

Re: optional input for 'record'

Jul-17-17 04:24:32

Modelica has variables of type "inner" and "outer" which can work as global variables inside a package.
If you could elaborate a little more maybe a better solution an be suggested.

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