Mailman 3 June 2004 - Cplusplus-sig

opencascade
by kevin＠kevinatkinson.com June 24, 2004

June 24, 2004

This email is addressed to Niki Spahiev; it is in regard to this message on mail.python.org: http://mail.python.org/pipermail/c++-sig/2003-March/003577.html I am trying to do precisely the same thing: generate boost.python wrappers using the metadata exposed in the cdl files of Open Cascade. Did you have any luck doing this? I ask because I am anxious to get my hands on a Python wrapper of Open Cascade, and at this point it's looking like I may have to do it myself. I know there is a fellow named Sandor Racz who has made an incomplete wrapper for 5.0, but I'm not having much luck with it. I would greatly appreciate any tips you might have in this regard. Best, Kevin Atkinson Software Developer

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Question: compiling library using <python/numeric.cpp> extension/wrapper
by Peter Vandersteegen June 24, 2004

June 24, 2004

Hello, I've recently discovered boost-python. Compiling several examples gave no problem. Working with lists etc also no problems. Compiling a simple library using the <python/numeric.cpp> extension/wrapper however resulted in several questions... Therefor I've one question: Question1: Is it correct to state the following? (something I find confusing) There are (at least) 2 ways to get a boost-layer between Numeric python and c++. The first one is based on <Numeric/arrayobject.h>, the other on <python/Numeric.hpp>... * The project num_util (http://www.eos.ubc.ca/research/clouds/software/pythonlibs/num_util/) uses the fist method? They use boost as wrapper, but for the array class, they directly use the python numeric array class and not the boost.python array class? * Directly using <python/Numeric.hpp> seperates you from dealing with the 'raw' python numeric array class? Added bonus: no need to write import_array() in BOOST_PYTHON_MODULE... Thus, is it correct to say that these are 2 different approaches to convert an array from python to c++ ? thx a lot for reading so far Peter

2 1

Question: compiling library using <python/numeric.cpp> extension/wrapper
by Peter Vandersteegen June 24, 2004

June 24, 2004

Hello, Sorry if you recieve this more than once ... I've recently discovered boost-python. Compiling several examples gave no problem. Working with lists etc also no problems. Compiling a simple library using the <python/numeric.cpp> extension/wrapper however resulted in several questions... Therefor I've one question: Question1: Is it correct to state the following? (something I find confusing) There are (at least) 2 ways to get a boost-layer between Numeric python and c++. The first one is based on <Numeric/arrayobject.h>, the other on <python/Numeric.hpp>... * The project num_util (http://www.eos.ubc.ca/research/clouds/software/pythonlibs/num_util/) uses the fist method? They use boost as wrapper, but for the array class, they directly use the python numeric array class and not the boost.python array class? * Directly using <python/Numeric.hpp> seperates you from dealing with the 'raw' python numeric array class? Added bonus: no need to write import_array() in BOOST_PYTHON_MODULE... Thus, is it correct to say that these are 2 different approaches to convert an array from python to c++ ? thx a lot for reading so far Peter

1 0

software
by herveus＠t2.technion.ac.il June 22, 2004

June 22, 2004

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[Re: Added to a vector_indexing_suite container in python]
by Jeff Holle June 19, 2004

June 19, 2004

I suspect that my previous post concerning this problem does not provide adequite information. So here is more. Following is a grep of my files that highlite what I'm trying to wrap with pyste and how I'm doing it: typedef std::vector<CParameter> Parameters; MemberFunction.h: Parameters& getParameters( void); MemberFunction.h: const Parameters& getParameters( void) const; MemberFunction.h:UMLModel::Parameters& PygetParameters(UMLModel::CMemberFunction& self); MemberFunction.pyste:exclude(a.getParameters) MemberFunction.pyste:add_method(a,"PygetParameters") MemberFunction.pyste:set_policy(a.PygetParameters,return_value_policy(copy_non_const_reference)) MemberFunction.pyste:rename(a.PygetParameters,"getParameters") The PygetParameters function exists because pyste throws errors in encountering the overloaded pair that are in-place to facilitate const correct coding. Note the method call policy that I'm applying, "copy_non_const_reference". It appears that this policy causes a copy of the container in the process of calling "getParameters" in python. I believe this because the following python script: aMethod.getParameters().append(aParm) print 'number of parameters is %d' % len(aMethod.getParameters()) prints: number of parameters is 0 I've added my own "push_back" method to this container in a way similiar to the iterator.cpp file. The same results occur, which are explained if a container copy is going on. It there a way to avoid this copy?

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Added to a vector_indexing_suite container in python
by Jeff Holle June 19, 2004

June 19, 2004

I am using gcc 3.2 and boost 1_31_0. In my application, I'm using python is a consumer of data created in C++ and housed in vectors wrapped with vector_indexing_suite. Now I want to create some Python scripts that are data producers for test purposes, but can't seem to be able to populate these containers. I've noted that a 'append' method is exposed, trying this doesn't add to the container. Attempting to use 'myContainer[0] = something' causes an illegal indexing exception on an empty container... Am I missing something? Do I have to add my own methods independent of the vector_indexing_suite?

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access information
by khoi June 19, 2004

June 19, 2004

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software
by timster＠mygale.org June 18, 2004

June 18, 2004

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software
by hellfire＠icsi.berkeley.edu June 18, 2004

June 18, 2004

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access information
by edelrio＠b.maus.de June 15, 2004

June 15, 2004

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