On Tue, Dec 2, 2008 at 7:04 PM, Mihail Konstantinov <[EMAIL PROTECTED]> wrote: > Dear all, > thanks a lot for your immediate responses that lead to a fast solution for my > previous problem. > > Here comes the next one. > > In the example below both classes A and B are derived from std::string.
It is not a good idea. Python string is immutable. May be you should consider custom converter. http://www.boost.org/doc/libs/1_37_0/libs/python/doc/v2/faq.html#custom_string >Class B can be implicitly converted to A by means of 'B::operator const A()'. >So the function printme(const A&) can also be called with an argument of class >B (see main function). > > My aim is to be able to call in python: >>>>import boost_ext >>>>b=boost_ext.B("hello world") >>>>boost_ext.printme(b) > but it produces the error: >> <class 'Boost.Python.ArgumentError'>: Python argument types in >> boost_ext.printme(B) >> did not match C++ signature: >> printme(A) > > Can I modify the declaration inside BOOST_PYTHON_MODULE so that the implicit > conversion is recognized and the above call boost_ext.printme(b) succeeds? Yes: http://www.boost.org/doc/libs/1_37_0/libs/python/doc/v2/implicit.html > Thank you > Mihail > > BTW, in the code below I'm using a preprocessor definition __BJAM__ which I > had to define explicitly in the Jamroot. Is there some variable defined by > default which I can use to distinguish between bjam builds and other > (testing) calls to g++? You can separate your source code to different files. -- Roman Yakovenko C++ Python language binding http://www.language-binding.net/ _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
