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Inheritance with data value redefinition [fritz,p.65]

#6726  Permalink Top

Inheritance with data value redefinition [fritz,p.65]

Jan-29-16 08:09:40

I found some strange case in Fritz tutorial, page 65:

slide: Inheriting definitions

Code:

record ColorData

    parameter Real red = 0.2;

    parameter Real blue = 0.6;

    Real green;

end ColorData;



class ErrorColor

    extends ColorData;

    parameter Real blue = 0.6;

    parameter Real red = 0.3;   // this line strangly marked as error due to _value_ redefenition

equation

    red + blue + green = 1;

end ErrorColor;

Isn't inheritance must garantee this case as inherited class behavior extension ?

#6727  Permalink Top

Re: Inheritance with data value redefinition [fritz,p.65]

Jan-29-16 08:12:44

For example I use some basic nozzle model with some parameter R with typical value 0.1,
but extends it with new model of same nozzle with new value R=0.05

#6729  Permalink Top

Re: Inheritance with data value redefinition [fritz,p.65]

Jan-29-16 10:56:12

If you have multiple elements with the same name that come from the local scope and the extends scope the have to be *identical* which is not the case in this particular example. The correct way to deal with changes is via modifications on the extends clause:

Code:


record ColorData 

    parameter Real red = 0.2; 

    parameter Real blue = 0.6; 

    Real green; 

end ColorData; 



class ErrorColor 

    extends ColorData(red=0.3, blue = 0.12); 

equation 

    red + blue + green = 1; 

end ErrorColor;

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