Thanks for the hints! However, Perl can't know about the relationship with the Perl classes, since in my typemap, I declared the following: 

fooRef T_PTROBJ
barRef T_PTROBJ
bazRef T_PTROBJ

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How should I go about telling Perl that fooRef actually is a Foo object?

In reply to Re^2: XSUBs with variable input types by crenz
in thread XSUBs with variable input types by crenz

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