cplusplus-sig@python.org discussions

0	[C++-sig] Why isn't python-exposed boost::gregorian::date available everywhere?

I thought I'd post this SO question here as well, thanks: I exposed boost::gregorian::date with the following: date_from_python_date{}; to_python_converter<date, date_to_python_date, true {}; where ...

MM
Sep 7, 2015 at 10:02 pm
Sep 7, 2015 at 10:02 pm

1	[C++-sig] boost python exposing const*

I have a c++ class T that I succesfully expose via: class_<T, T* ... later on, I have struct S { const T* underlying; }; class_<S,S* ("S"). .def_readonly("underlying", &S::underlying) ; s.underlying ...

MM
Sep 5, 2015 at 3:40 pm
Sep 9, 2015 at 8:04 am

8	[C++-sig] register c++ std::pair<string, string> and std::pair<string, string>

I expose the return type of a C++ function that is a pair of strings with the following snippet: to_python_converter< std::pair<std::string, std::string , Converter (); Later, I have a unrelated C++ ...

MM
Aug 28, 2015 at 11:49 am
Aug 28, 2015 at 3:42 pm

1	[C++-sig] Extracting base object reference of arbitrary Python object

Hi everyone, I have what I assume is a fairly basic or naive question, but I'm still quite new to Boost.Python so after scouring the documentation fruitlessly I need to turn to community wisdom. The ...

Jeremy Murphy
Aug 18, 2015 at 8:38 am
Aug 18, 2015 at 9:41 pm

4	[C++-sig] virtual functions with default implementation

Hi, I'm reviewing the Boost.Python tutorial, and I'm stumbling over the section on "Virtual Functions with Default implementations" ...

Stefan Seefeld
Aug 17, 2015 at 12:03 pm
Aug 17, 2015 at 9:44 pm

4	[C++-sig] express pointer ownership

I have the following class: class T { }; // T has been exposed to python with class_ and free function: void add_T( T* ); Ownership of the T* is taken by this C++ function. If I create an instance of ...

MM
Aug 13, 2015 at 9:24 am
Aug 13, 2015 at 4:09 pm

1	[C++-sig] [Boost.Python] Treating boost::variant like a reference?

Hi. I am trying (off and on, because it would be useful, but I am not quite there yet) to find a way to make Boost.Python cooperate with Boost.Variant. I sort of managed to make a variant behave like ...

Mario Lang
Aug 10, 2015 at 3:00 pm
Aug 15, 2015 at 12:16 pm

2	[C++-sig] Boost.Python docs update

Hi all, I have updated the Boost.Python documentation. The new docs are available at http://boostorg.github.io/python. (For any issues you notice please submit a bug report at ...

Stefan Seefeld
Aug 5, 2015 at 12:23 pm
Aug 6, 2015 at 4:12 pm

1	[C++-sig] Member overloads signature not matching C++ signature

I am trying to bind a C++ class but python is reporting there is no matching signature for two of the methods which are I am trying to bind using the member function overloads macro. The class looks ...

James Maddison
Jul 30, 2015 at 4:53 pm
Jul 31, 2015 at 3:04 pm

0	[C++-sig] distributing python with embedded app

Hi! I?ve compiled python 3.4.2 with vs2013, it works. I want to use python script for google oauth2 authentication. If i run the script from command line with my custom build python instance, it ...

Imre I Horvath
Jul 20, 2015 at 8:36 am
Jul 20, 2015 at 8:36 am

3	[C++-sig] C++ copy construction and Python object copies

Hello, Python's copy module allows for objects to be copied. The protocol for this will look up special method __copy__. It seems to me that this would trivially work for C++ objects providing a ...

Stefan Seefeld
May 29, 2015 at 2:28 pm
May 31, 2015 at 7:16 am

7	[C++-sig] Boost.Python C++ object reference in Python: unexpected behaviour.

Hi, I am having an issue with Boost.Python with a very simple use case. I am returning a reference to an object, and it seems that my python object looses its C++ object's reference at a stage for ...

Christoff Kok
May 28, 2015 at 7:29 am
Jun 3, 2015 at 7:43 am

5	[C++-sig] Returning values to Python in C++ reference arguments

How can results be returned in function arguments? I've include my example C++ extension and Python code below. I've tried, what I think, are some obvious approaches (Python objects, ctypes), though ...

Jason Addison
May 23, 2015 at 4:05 pm
May 26, 2015 at 12:14 pm

2	[C++-sig] undefined symbol: _ZTIN5boost6python15instance_holderE

Hi I have an application that uses Boost Python. It links and runs fine on Centos 5 systems but fails on an Ubuntu 14.04 LTS system. The code that uses Boost Python is compiled using: g++ -c -Wall ...

David Aldrich
May 19, 2015 at 8:44 am
May 20, 2015 at 8:09 am

0	[C++-sig] compilation problem with str

Hi, In: http://www.boost.org/doc/libs/1_58_0/libs/python/doc/tutorial/doc/html/python/exposing.html#python.class_operators_special_functions It is explained how to automagicaly get a str conversion ...

Alain Miniussi
May 12, 2015 at 2:44 pm
May 12, 2015 at 2:44 pm

2	[C++-sig] shared_ptr and GIL crash in boost::python (patch)

Hi everybody, I have been affected for years by the [1] bug: when shared_ptr for an object created in python is released in c++ in multi-threaded code, Python crashes -- because the ...

Václav Šmilauer
May 6, 2015 at 5:27 am
Aug 13, 2015 at 12:01 pm

3	[C++-sig] Boost.Python As Engine's Scripting Language

(Original Message Posted At : http://www.gamedev.net/topic/667952-boostpython-as-engines-scripting-language/ <http://www.gamedev.net/topic/667952-boostpython-as-engines-scripting-language/ ) Am I ...

Oam
Apr 28, 2015 at 1:30 am
Apr 28, 2015 at 1:07 pm

1	[C++-sig] Compile C++ to python extension

Hi, I'm trying to compile C++ class to a python module extension. I found a way here: http://www.boost.org/doc/libs/1_52_0/libs/python/doc/building.html#configuring-boost-build but it doesn't work ...

Quentin Blanchon
Apr 23, 2015 at 8:28 am
Apr 24, 2015 at 12:50 pm

7	[C++-sig] subprocess fork() sometimes hangs when called from within boost::python::exec_file

Dear all, In the hexhex project on github [1] we execute a python program using boost::python::exec_file, the respective code is in src/PythonPlugin.cpp in the function ...

Peter Schüller
Apr 2, 2015 at 7:12 pm
May 13, 2015 at 10:05 am

5	[C++-sig] Boost.Python "contains" compile fix

Hi, adding more Python 3 features, the "contains" method was added (in 1.55.0?) http://www.boost.org/doc/libs/1_55_0/libs/python/doc/news.html Unfortunately, I found a nasty compile bug when ...

Huebl, Axel
Mar 30, 2015 at 3:16 pm
Mar 30, 2015 at 8:42 pm

4	[C++-sig] Boost python exposing abstract class , function returning boost::shared_ptr

I have an abstract class A2, with derived class B2. I want to map a function returning a boost::shared_ptr of A. This abstract class is wrapped : struct A2{ virtual ~A2(){} virtual int ret() =0; } ...

Warin
Mar 27, 2015 at 1:27 pm
Mar 30, 2015 at 1:08 pm

0	[C++-sig] Reuse PyObject for non python instanciated C++ objects

I have a use case where we have a C++ framework that is exposed through boost python. If I use a C++ factory to create objects, I want to always return the same python object once it is exposed. I've ...

Goode, Carl R (PG GT LGT EN MT 4 2)
Mar 25, 2015 at 7:45 pm
Mar 25, 2015 at 7:45 pm

0	[C++-sig] Linking with Python3 Libs

Hi, I'm trying to figure out how to build Python modules using Boost Python against Python3; and I'm currently stuck at getting cmake to find Python 3. I have already installed Python3 via brew ...

Dong Ta
Mar 25, 2015 at 12:21 am
Mar 25, 2015 at 12:21 am

1	[C++-sig] Passing std::wstring to Python callback

Hi I am using boost python for providing python bindings for a C++ library. I am using Python 2.7. My library needs to call callbacks that are defined in Python. There callbacks can take a string ...

Bogdan Cristea
Mar 18, 2015 at 9:25 pm
Apr 3, 2015 at 8:16 am

2	[C++-sig] Subclassing C++ classes in Python

Hi there, I am creating binding for some C++ classes and I need to be able to subclass exposed C++ classes in Python (and pass subclassed instances back in to C++ code). I was able to make this work ...

Ernie Lee
Mar 16, 2015 at 12:34 am
Mar 16, 2015 at 6:05 pm

0	[C++-sig] [pybindgen] How to wrap char** argv[]?

[I posted the same question on Ubuntu's Launchpad's answers site, where earlier discussions of pybindgen took place. However, there seems to be no activity on that site, so i am reposting here] ...

Stefano franchi
Mar 12, 2015 at 4:05 pm
Mar 12, 2015 at 4:05 pm

6	[C++-sig] Memory management in Boost.Python

Hello, I am working on adding Python binding to C++ project and run into the following problem: For some reason Python tries to delete objects that are still held by smart pointer instances in our ...

Ernie Lee
Mar 9, 2015 at 8:26 pm
Apr 2, 2015 at 7:05 pm

0	[C++-sig] Cplusplus-sig Digest, Vol 76, Issue 6

Well, I'm embarrassed. I don't believe I did that. Thanks so much! From: Cplusplus-sig [cplusplus-sig-bounces+cbotos=aer.com at python.org] on behalf of cplusplus-sig-request at python.org ...

Botos, Christopher
Feb 23, 2015 at 7:35 pm
Feb 23, 2015 at 7:35 pm

1	[C++-sig] Wrapping virtual method returning void

I have an example C++ base class (Song) with a virtual method (chorus) returning void that is called by another method (play) of the same class. I want to be able to derive a python class from this ...

Botos, Christopher
Feb 20, 2015 at 3:29 pm
Feb 23, 2015 at 7:52 am

2	[C++-sig] passing by non-const reference?

Hi, Based on websearches we have done, we believe that boost-python does not allow passing arguments by non-const-reference (at least, not easily). Can someone confirm this is still the case, or ...

Christopher O'Grady
Feb 18, 2015 at 10:13 pm
Feb 19, 2015 at 1:25 pm

3	[C++-sig] Boost.Python: Review of Patches

Hm, the language binding is dead and 404 http://sourceforge.net/p/boost/mailman/boost-langbinding/ Has anyone an idea about my question? :) Best, Axel -- Axel Huebl Phone +49 351 260 3582 ...

Huebl, Axel
Feb 2, 2015 at 6:43 pm
Feb 12, 2015 at 10:20 am

4	[C++-sig] [Boost Python] Cannot call base method from within python extended class method

Hello, My problem is the following: I am trying to bind a third party C++ library to python using boost-python. This library has a class Element and a class Owner (the later takes ownership of an ...

Tiago Coutinho
Jan 8, 2015 at 5:42 pm
Jan 13, 2015 at 4:07 pm

1	[C++-sig] boost python wrapping boost message queue problem

Hi all. I wrapped the boost ipc message queue into Python using Boost.Python. Everything goes fine except I found that 1. the try_receive / try_send will block python when the mq is empty / full. 2 ...

袁振飞
Jan 7, 2015 at 2:19 pm
Jan 9, 2015 at 8:40 am

0	[C++-sig] How to override a property setter?

I got a class: class X { private: std::wstring text_; public: std::wstring text() const { return text_; } void set_text(const std::string& text) { text_ = from_utf8(text); } void set_text(const ...

Ilias
Dec 18, 2014 at 11:21 am
Dec 18, 2014 at 11:21 am

4	[C++-sig] Weird function call results

I got an overloaded function: void f(int n) { std::clog << "invoked f(int n = " << n << ")" << std::endl; } void f(double d) { std::clog << "invoked f(double d = " << d << ")" << std::endl; } If I ...

Ilias
Dec 18, 2014 at 11:13 am
Dec 27, 2014 at 7:45 pm

4	[C++-sig] Passing opaque data to C++ callback from Python

I'm embedding Python (using boost::python) into an application plugin that uses callbacks. Essentially, I want to do something like: In Python (say test.py): def do_something(): .. ...

Peter LaDow
Dec 17, 2014 at 4:13 am
Dec 19, 2014 at 4:26 am

1	[C++-sig] Exposing std::vector using vector_indexing_suite

Hi, We have a simple data structure like this, that we would like to expose via boost python: struct Layer { double value; }; struct Document { std::vector< Layer layer; }; If we were writing this in ...

James Bird
Nov 25, 2014 at 2:54 pm
Nov 26, 2014 at 12:02 pm

0	[C++-sig] mds-utils 2.1.1 released

I am pleased to announce the release of mds-utils 2.1.1 <http://www.micheledestefano.joomlafree.it/en/mds-utils.html . This release fixes small bugs present into the 2.1.0 release. Users are strongly ...

Michele De Stefano
Nov 21, 2014 at 1:43 pm
Nov 21, 2014 at 1:43 pm

11	[C++-sig] Bugs in the Boost.Python tutorial example

Hi, I had a hard time building the example/tutorial project. Some of this is, I believe, due to bugs in the distribution, and some is probably my lack of understanding. Some of this I posted to the ...

Michael Rolle
Nov 17, 2014 at 4:10 am
Nov 18, 2014 at 8:28 am

2	[C++-sig] Handling Python exceptions from an exposed C++ function

Hello all, I don't know if the subject makes any sense, but hopefully the description of the problem will make things clearer :) I have a template class which I am exposing to Python with different ...

Francesco Biscani
Nov 16, 2014 at 6:51 pm
Nov 16, 2014 at 7:47 pm

0	[C++-sig] Build isn't finding the Python functions for shared linke

Hi, I'm following the instructions for building Boost, as far as I know correctly. When I run 'b2 python link=shared', I get link errors for symbols in the Python interpreter. The problem is that ...

Michael Rolle
Nov 15, 2014 at 9:26 pm
Nov 15, 2014 at 9:26 pm

0	[C++-sig] Cplusplus-sig Digest, Vol 70, Issue 5

An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/cplusplus-sig/attachments/20141113/bc645169/attachment.html ??????? -------- ???? -------- ????cplusplus-sig-request at ...

515f2
Nov 13, 2014 at 1:34 pm
Nov 13, 2014 at 1:34 pm

0	[C++-sig] Boost.Python and thread safety

Hi all, I'm trying to determine if the following constitutes a thread safety violation with Python. To simplify the discussion, let's say have the following fictional classes: * Teacher - Fully ...

Davidson, Josh
Oct 29, 2014 at 3:34 pm
Oct 29, 2014 at 3:34 pm

1	[C++-sig] Exposing simple polymorphism with boost python

Hi Python-Experts :-) i am starting to get really frustrated trying to expose a simple C++ polymorphism to python with boost::python. I do have the following structure in C++: struct Base { int ...

Erik Türke
Oct 23, 2014 at 7:38 am
Oct 24, 2014 at 11:09 am

8	[C++-sig] sharing code between different python extensions

Hi there I have a little problem with two Python extensions (C++ with boost::python) where share code. An example of what I am trying to do is attached to this mail so I will refer to the code in the ...

Wintersberger, Eugen
Oct 22, 2014 at 12:08 pm
Oct 28, 2014 at 3:21 pm

5	[C++-sig] boost python class member getter/setter same name different only by constness

Hi class C { public: const std::string& name() const; std::string& name(); private: std::string name_; }; given this class C, how would I expose it to python with the class property name? class_<C ...

MM
Oct 2, 2014 at 8:09 pm
Oct 3, 2014 at 6:11 pm

2	[C++-sig] Building Boost with python2.7 libraries on centos 6.5

Dear All, I must build boost 1.46.1 from source since yum does not support it. I am running into issues with the proper make commands. I have run: ./bootstrap.sh -with-libraries=python ...

Whitmore, Mattie [USA]
Sep 9, 2014 at 10:19 pm
Sep 11, 2014 at 8:12 am

1	[C++-sig] Boost python extract on Mac OS Mavericks - seg fault

Hi all, I am having trouble with a really simple example, and I am hoping someone on this list can help me. I have created a github repo for code in question: git clone git at ...

Brian Bruggeman
Aug 28, 2014 at 10:19 pm
Aug 30, 2014 at 1:38 pm

0	[C++-sig] mds-utils 2.0.0 released

I am pleased to announce the release of mds-utils 2.0.0 <http://www.micheledestefano.joomlafree.it/en/mds-utils.html . MDS-UTILS provides: 1. a tool for detecting machine endianity. 2. utilities for ...

Michele De Stefano
Aug 15, 2014 at 7:38 pm
Aug 15, 2014 at 7:38 pm

1	[C++-sig] Boost Python on Windows

I would like to know if it is possible to use Boost-compiled pyd on Windows that do not have Boost Python installed. If so, how can I do it ? Thank you for your help, Olivier Zheng An HTML attachment ...

Olivier Zheng
Aug 11, 2014 at 8:10 am
Aug 12, 2014 at 6:51 pm

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