Re: [Boost-users] [boost.python] use of multi_array in python

Thank you again for the quick reply! I will try what you have suggested. One last question, If I have a header file to export with its implementation file, how do I go about linking the object file with the library that is created with bjam? When I start bjam to compile the shared library it does not link nor compile the implementation file with the shares library... Ex.: // Boost Includes ============================================================== #include "boost/multi_array.hpp" #include "boost/python.hpp" #include "boost/cstdint.hpp" // Includes ==================================================================== #include "Fstd.h" #include "MatrixAlgorithm2D.h" // Using ======================================================================= using namespace boost::python; // Module ====================================================================== BOOST_PYTHON_MODULE(matrix) { class_< Fstd >("Fstd", init< const Fstd& >()) .def(init< std::string >()) .def("getTT", &Fstd::getTT) .def("getUV", &Fstd::getUV) ; class_< MatrixAlgorithm2D >("MatrixAlgorithm2D", init< >()) .def(init< const MatrixAlgorithm2D& >()) .def("windChill", &MatrixAlgorithm2D::windChill) .def("display_d", &MatrixAlgorithm2D::display_d) .staticmethod("windChill") .staticmethod("display_d") ; class_ >("multi_array_2d"); class_

("const_multi_array_ref_2d");

implicitly_convertible, const_multi_array_ref >(); } I have MatrixAlgorithm2D.h, Fstd.h and Fstd.cpp, when I execure bjam the shared library is created but not the object file for Fstd.cpp, so when I try to use this from Python, it fails... Daniel Wallin wrote:

Sebastien Fortier wrote:

...

Thank you very much Daniel!

I had another question, is it possible to use multi_array and const_multi_array_ref together in python. What I mean is, if I create a multi_array from python through my c++ functions and I want to pass this array to another c++ function that uses a const_multi_array_ref how do I manage this in the interface file? is this possible?

I added class_

...

("const_multi_array_2d_ref"); to my interface file but the types seem to be incompatible.

You need to let Boost.Python know that the types are convertible:

implicitly_convertible< multi_array , multi_array_ref

...

();

implicitly_convertible< multi_array , const_multi_array_ref

...

();

Should do it. See http://www.boost.org/libs/python/doc/v2/implicit.html.

...

I would prefer to use the const_multi_array_ref with the multi_arrays to avoid copies...

If you already have multi_array's, why don't you just pass them by reference?

-- Sébastien Fortier