It seems XSpp is another system that is completely different with XS. So I'll have to suffer another painful learning......

I hope not, it should be quite simple.

See http://steffen-mueller.net/talks/xspp/xspp-talk.pdf / XS++ - bonding Perl and C++ with minimal pain
https://metacpan.org/source/SMUELLER/ExtUtils-XSpp-0.18/examples/
Object/WithIntAndString.pm
XSpp/Example.pm

See also Re: Interfacing Perl with C++, using XS, with external files, and using the STL as parameters and return values.
Math::ThinPlateSpline / Re: C tutorial for Perl programmers? (hard lint strict warnings bondage perlxspp)
SOso-0.01.patch.txt

In reply to Re^3: XS cannot properly handle typemap with namespace (use XSpp) by Anonymous Monk
in thread XS cannot properly handle typemap with namespace by llancet

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