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  • Partial override of a class

Partial override of a class

OVM 2521
class 1 override 2 function 1 Inheritance 1
Peak25500
Peak25500
Full Access
6 posts
October 18, 2017 at 5:16 am

Hi guys,

Here is my problem:
I have a class BaseClass that I extend to DerivedClass.
In BaseClass, I have three function that are A, B and C. Function A calls B which itself calls C.
In DerivedClass I have overriden functions A and C to A_ and C_.
When I'm running simulation, A_ calls B which then calls C while I'd like to call C_.
Is there a way to do so?
For now, as a workaround, I just copied B to DerivedClass.

Thanks in advance,
Johan

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dave_59
dave_59
Forum Moderator
10909 posts
October 18, 2017 at 8:32 am

In reply to Peak25500:

Are A and C declared as virtual methods?

— Dave Rich, Verification Architect, Siemens EDA

Peak25500
Peak25500
Full Access
6 posts
October 20, 2017 at 5:53 am

In reply to dave_59:

Hi Dave,

Thanks for your reply and sorry for my delay to answer...
In fact A and C are not declared as virtual. They are normally declared in BaseClass and just redefined in DerivedClass with A_ and C_.

If I understand well, I shall declare them as virtual in BaseClass? Shall them be empty in BaseClass or they can have a description there?

Solution

Solution

dave_59
dave_59
Forum Moderator
10909 posts
October 20, 2017 at 10:34 am

In reply to Peak25500:

Yes, they need to be virtual to accomplish what you describe. And since you already said that you have a BaseClass method A that calls B, it cannot be empty.
Please see my SystemVerilog OOP course for more details about how inheritance works.

— Dave Rich, Verification Architect, Siemens EDA

Peak25500
Peak25500
Full Access
6 posts
October 23, 2017 at 1:57 am

In reply to dave_59:

Thanks Dave!
I'll have a look at your course and try to solve my problem.

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