Re: cross-project inheritance question

Hi William --

I have been using %import extensively, within each project, but I can't get it to work when importing the swig file from the other project.  I've been using a simplified version of the imported swig file, because I don't want to import all of the class information.  The two projects use different values of SWIG_TYPE_TABLE.   Would that make A reject a derived class from B?

I'll work on a simplified example to see if it does the same thing.

-- Steve

From: William S Fulton <[email protected]>
Date: Thursday, October 13, 2022 at 4:08 PM
To: "Langer, Stephen A. (Fed)" <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [Swig-user] cross-project inheritance question

Have a look at %import which imports type information, but doesn't wrap the types. There is a python example shipped with SWIG in the Examples/python/import directory.

William

On Thu, 13 Oct 2022 at 20:42, Langer, Stephen A. (Fed) via Swig-user <[email protected]<mailto:[email protected]>> wrote:
Hi --

I have two projects, A and B. Both are a mix of C++ and Python, with swig4 interfaces.  Project A defines some classes that are used in project B, both by importing python modules and by C++ #includes.   A C++ class in B  (BClass) is derived from a C++ class in A (AClass).  Both classes have swig-generated Python equivalents.

In Python, I want to pass a wrapped instance of the derived class (in B) to a wrapped function in A that expects an AClass* argument.  But the wrapper for A is rejecting the argument because it doesn't know that BClass is derived from A's AClass.  How can I tell swig about the inheritance?  I've tried declaring AClass as "extern" in B's swig file, and also duplicating AClass in the file, but those don't seem to work.

Should I add a typemap to A so that the function doesn't check its argument type, and just call SWIG_ConvertPtr manually?

Thanks,
   Steve



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