Mailman 3 November 2005 - Cplusplus-sig

[Announce] pyplusplus 0.6.0
by Roman Yakovenko Nov. 29, 2005

Nov. 29, 2005

Hi. I would like announce of new version of pyplusplus (0.5). What is pyplusplus? pyplusplus is an object-oriented framework for creating a code generator for boost.python library. You can find pyplusplus here: http://www.language-binding.net/ You can download pyplusplus from http://sourceforge.net/project/showfiles.php?group_id=118209. Changes: 1. Code repository has been introduced. This repository contains classes and functions that will help users to export different C++ classes and declarations. Right now this repository contains two classes: array_1_t const_array_1_t Those classes helps to export static, single dimension arrays. As you can guess static, single dimension arrays are now supported. 2. Code generation has been improved. 3. Code generation speed has been improved. 4. If you have Niall Douglas void* patch, then you can enjoy from automatically set call policies. 5. Bit fields can be accessed ( get\\set ) from Python. 6. Creating custom code creater example has been added. 7. To Pyste comparison has been wrote. 8. Using this version it is possible to export most of TnFOX Python bindings. Roman Yakovenko

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boost.python and std::valarray
by Trevor Tippetts Nov. 29, 2005

Nov. 29, 2005

I'm relatively new (and very impressed) user of boost.python. I do have a question, however. When I try to access members typed in c++ as std::valarray<> in python, I get errors like this: No Python class registered for C++ class std::valarray<int> After searching through list archives and online docs and wikis, I have come to the conclusion that pyste and boost.python do not have a built-in wrapper for std::valarray<> and std::vector<> types. Is that a correct assumption? I found some examples people have given for wrapping std::vector<>, but not for std::valarray<>. Does anyone know of a good example implementation to which the rest of us could refer? Thanks, Trevor -- After due consideration, this message was judged by Trevor Tippetts not to contain technical or programmatic information and therefore does not require classification review. -- Trevor Tippetts Los Alamos National Laboratory -- ESA-WR T080 Los Alamos NM 87545 505-667-9009 <tippetts(a)lanl.gov>

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iterator over list and sequences
by Yves Secretan Nov. 28, 2005

Nov. 28, 2005

Hello all, In search for a simple way to iterate in C++ over a boost::python::list, I only found a discussion about how nice it would be to have one ( http://mail.python.org/pipermail/c++-sig/2003-March/003528.html). So I wrote a set of C++ iterators and ended up with a syntax a little more complex than what was originally proposed by David Abrahams, but maybe I missed something. typedef value_iterator<int> iter_type; for (iter_type i = begin<iter_type>(lst); i != end<iter_type>(); ++i) { whatever(*i); } The tests provided have been run with gcc 3.3 mingw, visual c++ 7.0 and Intel 7.1 on WindowsXP (Boost 1.33.0, Python 2.4). Is there any interest? --------------------------------------------------------------- Yves Secretan, Professeur INRS-ETE 490, rue de la Couronne Québec, Québec G1K 9A9 CANADA tel: (418) 654 38 48 fax: (418) 654 26 00 e-mail: Yves_Secretan(a)ete.inrs.ca ---------------------------------------------------------------

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Any word on when Py_Finalize will be implemented in boost::python yet?
by Matt Nov. 26, 2005

Nov. 26, 2005

Just curious.

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[Boost.Python] map_indexing_suite problem
by Jan Langer Nov. 26, 2005

Nov. 26, 2005

Hello, I ran into a problem with Boost.Python exporting a std::map. I used the following code below. I use Boost 1.33.0 and everything compiles fine. ------------ #include <boost/python.hpp> #include <boost/python/suite/indexing/map_indexing_suite.hpp> using namespace boost::python; typedef std::map <int, std::string> map_t; struct A { map_t data; std::string str; }; BOOST_PYTHON_MODULE(test) { class_ <map_t> ("test_map") .def (map_indexing_suite <map_t> ()); class_ <A> ("A") .def_readonly ("data", &A::data) .def_readwrite ("str", &A::str); } ------------- Then I run Python and try to use the module: ------------ laja@bridge:python> python Python 2.4.1 (#1, Sep 2 2005, 09:48:20) [GCC 2.95.2 19991024 (release)] on sunos5 Type "help", "copyright", "credits" or "license" for more information. \>>> import test \>>> a = test.A() \>>> a.str="text" \>>> a.str 'text' \>>> a.data[0]="text2" \>>> a.data[0] Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: No Python class registered for C++ class t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i0 ----------- I played around for a while but I find no solution. Regards, Jan

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type-punning in boost python code.
by Philipp Thomas Nov. 25, 2005

Nov. 25, 2005

our gcc 4.1 also analyses C++ code for violation of the C/C++ aliasing rules (mainline doesn't do so yet). For the code in boost 1.33.1 I get warning: dereferencing type-punned pointer will break strict-aliasing rules for the following files: /usr/src/packages/BUILD/boost_1_33_1/libs/python/build/../src/long.cpp: 12,19, 26 /usr/src/packages/BUILD/boost_1_33_1/libs/python/build/../src/dict.cpp: 32 /usr/src/packages/BUILD/boost_1_33_1/libs/python/build/../src/tuple.cpp:12 /usr/src/packages/BUILD/boost_1_33_1/libs/python/build/../src/str.cpp: 12 /usr/src/packages/BUILD/boost_1_33_1/libs/python/build/../src/object/class.cpp:543, 553 /usr/src/packages/BUILD/boost_1_33_1/libs/python/build/../src/list.cpp: 15 as our package build system treats this warning as an error, I will use -fno-strict-aliasing for gcc as I'm not familiar with that code and I want to get the package built. For boost you should also consider either using said gcc switch or fix the code to not break strict-aliasing rules. I'd recommend doing the latter as switching off aliasing analysis will inhibit some optimisations. Philipp

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returning reference to enum
by Emmanuel Taurel Nov. 22, 2005

Nov. 22, 2005

Hello everybody, I have a very simple example where I try to wrap a C++ class. In this class there is a method which returns a reference to an internal variable which is an enumeration. I try to wrap this method with the return_internal_reference Call Policy but I have a compiler error. First here is my little C++ file ---------------------------------------------------------------------------- ------------ #include <boost/python.hpp> using namespace boost::python; enum DispLevel { OPERATOR = 0, EXPERT }; class MyClass { public: MyClass() {} ~MyClass() {} void set_enum(DispLevel dl) {disp=dl;} DispLevel &get_enum() {return disp;} protected: DispLevel disp; }; BOOST_PYTHON_MODULE(PyTangoDs) { enum_<DispLevel>("DispLevel") .value("OPERATOR",OPERATOR) .value("EXPERT",EXPERT) ; class_<MyClass>("MyClass") .def("set_enum",&MyClass::set_enum) .def("get_enum",&MyClass::get_enum,return_internal_reference<>()) ; } The error I get from the compiler is : ---------------------------------------------------------------------------- --------------------------------------------------------- gcc-C++-action bin/enum/PyTangoDs.so/gcc/debug/shared-linkable-true/py_ds.o /home/etaurel/src/boost_1_33_0/boost/python/object/make_instance.hpp: In static member function `static PyObject* boost::python::objects::make_instance_impl<T, Holder, Derived>::execute(Arg&) [with Arg = DispLevel*, T = DispLevel, Holder = boost::python::objects::pointer_holder<DispLevel*, DispLevel>, Derived = boost::python::objects::make_ptr_instance<DispLevel, boost::python::objects::pointer_holder<DispLevel*, DispLevel> >]': /home/etaurel/src/boost_1_33_0/boost/python/to_python_indirect.hpp:96: instantiated from `static PyObject* boost::python::detail::make_reference_holder::execute(T*) [with T = DispLevel]' /home/etaurel/src/boost_1_33_0/boost/python/to_python_indirect.hpp:60: instantiated from `PyObject* boost::python::to_python_indirect<T, MakeHolder>::execute(const U&, mpl_::bool_<false>) const [with U = DispLevel, T = DispLevel&, MakeHolder = boost::python::detail::make_reference_holder]' /home/etaurel/src/boost_1_33_0/boost/python/to_python_indirect.hpp:37: instantiated from `PyObject* boost::python::to_python_indirect<T, MakeHolder>::operator()(const U&) const [with U = DispLevel, T = DispLevel&, MakeHolder = boost::python::detail::make_reference_holder]' /home/etaurel/src/boost_1_33_0/boost/python/detail/invoke.hpp:88: instantiated from `PyObject* boost::python::detail::invoke(boost::python::detail::invoke_tag_<false, true>, const RC&, F&, TC&) [with RC = boost::python::to_python_indirect<DispLevel&, boost::python::detail::make_reference_holder>, F = DispLevel&(MyClass::*)(), TC = boost::python::arg_from_python<MyClass&>]' /home/etaurel/src/boost_1_33_0/boost/python/detail/caller.hpp:199: instantiated from `PyObject* boost::python::detail::caller_arity<1>::impl<F, Policies, Sig>::operator()(PyObject*, PyObject*) [with F = DispLevel&(MyClass::*)(), Policies = boost::python::return_internal_reference<1, boost::python::default_call_policies>, Sig = boost::mpl::vector2<DispLevel&, MyClass&>]' /home/etaurel/src/boost_1_33_0/boost/python/object/py_function.hpp:38: instantiated from `PyObject* boost::python::objects::caller_py_function_impl<Caller>::operator()(PyObject *, PyObject*) [with Caller = boost::python::detail::caller<DispLevel&(MyClass::*)(), boost::python::return_internal_reference<1, boost::python::default_call_policies>, boost::mpl::vector2<DispLevel&, MyClass&> >]' /home/etaurel/src/boost_1_33_0/boost/detail/call_traits.hpp:83: instantiated from here /home/etaurel/src/boost_1_33_0/boost/python/object/make_instance.hpp:24: error: incomplete type `boost::STATIC_ASSERTION_FAILURE<false>' does not have member `value' ---------------------------------------------------------------------------- ----------------------------------------------------------- Any idea welcome. Thank's very much in advance Emmanuel Taurel (etaurel(a)cells.es)

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SciPy Core
by Nariman Habili Nov. 21, 2005

Nov. 21, 2005

I'm wondering whether the boost python numeric wrappers will be updated to scipy core? Thanks.

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porting Qt 3.3.x to python
by Seker, Noam Nov. 21, 2005

Nov. 21, 2005

Hi, Is there an available boost/python package for Qt 3.3.x? thanks Noam Seker-Gafni phone: +972 - 4 - 865 5260 inet: 8 - 465 5260 email: noam.seker(a)intel.com

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[Boost.Python] map_indexing_suite problem
by Jan Langer Nov. 20, 2005

Nov. 20, 2005

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello, I ran into a problem with Boost.Python exporting a std::map. I used the following code below. I use Boost 1.33.0 and everything compiles fine. >>>>>>>>>>> #include <boost/python.hpp> #include <boost/python/suite/indexing/map_indexing_suite.hpp> using namespace boost::python; typedef std::map <int, std::string> map_t; struct A { map_t data; std::string str; }; BOOST_PYTHON_MODULE(test) { class_ <map_t> ("test_map") .def (map_indexing_suite <map_t> ()); class_ <A> ("A") .def_readonly ("data", &A::data) .def_readwrite ("str", &A::str); } <<<<<<<<<<<< Then I run Python and try to use the module: >>>>>>>>>>>> laja@bridge:python> python Python 2.4.1 (#1, Sep 2 2005, 09:48:20) [GCC 2.95.2 19991024 (release)] on sunos5 Type "help", "copyright", "credits" or "license" for more information. >>> import test >>> a = test.A() >>> a.str="text" >>> a.str 'text' >>> a.data[0]="text2" >>> a.data[0] Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: No Python class registered for C++ class t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i0 <<<<<<<<<<<< I played around for a while but I find no solution. Regards, Jan -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (SunOS) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFDfhJ5yJOS3PG4wcwRAihcAJsFhjuOtOykJlyC9JKsg1yobwOsKgCgxQa5 l6GQlwbGXfjizZ3BVVo81Io= =Jebw -----END PGP SIGNATURE-----

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