Mailman 3 December 2004 - Cplusplus-sig

RE: Wrapper for exception translation
by Gottfried.Ganssauge＠HAUFE.DE April 4, 2006

April 4, 2006

> -----Original Message----- > From: David Abrahams [mailto:dave@boost-consulting.com] > Sent: Monday, December 13, 2004 1:04 PM > To: c++-sig(a)python.org; Gottfried Ganßauge > Subject: Re: Wrapper for exception translation > > > Gottfried Ganßauge wrote: > > Hi Dave, > > > > I digged through the class_<> implementation and I think I > know what I > > must do to implement it. Like you suggested I would add another > > argument to the class_base constructor which is used as > another base > > class for the newly created class. > > Hi Gottfried, Hi Dave, > > I don't know if you're still listening, but today I offered to > implement this patch on the C++-sig (see my other post). > Are you still interested? I am still listening but was buried deeply with work so I even had to abandon the work already invested into this. Nonetheless: Yes - I'm still interested. Cheers, Gottfried P.S.: What second Post? I got 2 Copies of this one. > > > > -- > Dave Abrahams > Boost Consulting > http://www.boost-consulting.com >

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what happened with this std::string parameter in boost.python
by Donnie Leen April 4, 2005

April 4, 2005

I made a program embedding boost.python, writting a module as following: void write( std::string s ) { // do nothing } BOOST_PYTHON_MODULE(mym) { def( "write", &write ); } I run the python code: import mym s = 'hello' mym.write(s) it runs ok, but if i run the python code as following: import mym s = int.__doc__ mym.write(s) it crashed, and it seems to crashed while boost.python try to delete the parameter s. Can someone tell me what happened to it? Thanks first. Donnie Leen

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Making copy of function derived from C++ pure virtual function
by Paul F. Kunz March 23, 2005

March 23, 2005

I have a function written in Python derived from C++. Now I want to clone this function in C++. What should I do in the copy constructor of the function wrapper? I have... FunctionWrap:: FunctionWrap ( const FunctionWrap & wrap ) : FunctionBase ( wrap ), m_self ( wrap.m_self ) { // what should be here to create a new PyObject that is copy of old one? } FunctionBase * FunctionWrap:: clone () const { return new FunctionWrap ( *this ); }

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Re: [C++-sig] Re: a working example of wrapping an instantiated c++ object
by Yao Heling March 17, 2005

March 17, 2005

Ok, I'll try to write a small tutorial for this. I'll post it here when it's ready. Thanks for your help, Joseph __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com

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Wrapping C++ class with unnamed union
by Kevin Vance Feb. 11, 2005

Feb. 11, 2005

Hi, I am new to boost.python, so there may be a very simple answer to this. I would like to access the OGRE graphics library from python. But it has several classes with data like this: union { struct { Real r,g,b,a; }; Real val[4]; }; And I cannot access e.g. 'r' with a statement like: .def_readwrite("r", &Ogre::ColourValue::r) I'm assuming this is because there is an unnamed union and unnamed struct in between the class and the 'r'. I could write a new C++ class to wrap this one, and then use boost to wrap *that*. But if there is a simpler way, I would rather use it. Thanks for your advice, kvance

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ANN: Fusion v0.2, C++ integration for Twisted
by Itamar Shtull-Trauring Jan. 4, 2005

Jan. 4, 2005

Fusion is a library that supports implementing protocols in C++ for use with Twisted, allowing control over memory allocation strategies, fast method calls internally, etc.. Fusion supports TCP, UDP and multicast, and is implemented using the Boost.Python python bindings. Fusion has only been tested on Linux - Debian GNU/Linux with gcc 3.3 on PowerPC and Redhat 7.3 with gcc 2.96 on x86. Fusion is licensed under the MIT license, and available for download from http://itamarst.org/software/fusion-0.2.tar.gz Features supported in v0.2: 1. Scheduling functions with the twisted event loop from C++ (callLater and LoopingCall). 2. Support for implementing C++ UDP and multicast protocols. 3. Support for implementing C++ TCP protocols (client and server), with a zero-copy buffering layer written in C++. Protocols implemented in Python can also use this custom buffering layer. There are two write APIs, one accepting a functor/function that writes to a buffer allocated by Fusion, and the other accepting a shared_ptr that points at an instance that owns a buffer. ** WARNING ** Writing networking code in C++ can lead to buffer overflows and other unpleasant security problems. Stick to pure Python unless you have no other choice and know what you're doing. Don't assume I know what I'm doing, either - bug reports are more than welcome :)

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Pyste patch: fix 3 bugs and add new-style polymorphism
by Baptiste Lepilleur Jan. 3, 2005

Jan. 3, 2005

The attached patch fixes the following bugs in pyste: - boost::non_copyable was not always inserted at the end of the class_ template declaration (resolved by changing the call order of the Export* methods) - policy for overloaded member functions was passed as another parameters to def() instead of using [policy]. Fix in ExportMethods. - default parameters overload resolution failed on virtual when using an instance of the base C++ object (see VirtualNonCopyableTest for detail). New-polymorphism is now used for virtual member function wrapper (it was the easiest way to get everything working for the last bug). It should be noted that default parameter for *protected* virtual member functions has been disabled (no simple robust solution at the current time). The attached file main.cpp/TestOverload.cpp is an output of the new code generated by pyste for the attached test cases. TestOverLoad.pyste/h and overloadtest.py demonstrates the bugs. The code generated by this patches has been successfully compiled on VC++ 2003 with boost 1.32. The generator has been tested on pyogre (100 classes, 3800 methods/variables) with success. Baptiste.

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Reduce the resulting .so file size
by João Paulo Fernandes Farias Dec. 30, 2004

Dec. 30, 2004

Hi! Is there a way to reduce the final .so file size? I've ported pyogre to linux and the final .so file is about 63Mb. Thanks. -- JP

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Re: [C++-sig] Reduce the resulting .so file size
by Niall Douglas Dec. 29, 2004

Dec. 29, 2004

On 29 Dec 2004 at 14:36, Jonathan Brandmeyer wrote: > On Wed, 2004-12-29 at 15:33 -0300, João Paulo Fernandes Farias wrote: > > Hi! > > Is there a way to reduce the final .so file size? > > I've > ported pyogre to linux and the final .so file is about 63Mb. > > If you want to try something experimental, use this patch to reduce > the default symbol visibility in your module: > http://www.nedprod.com/programs/gccvisibility.html No one mentioned that GCC v4 from CVS already contains the GCC visibility patch, so I will here. They've also changed the intermediate code description language so it may produce bigger or smaller final binaries after optimisation (one would think smaller). Cheers, Niall

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Adding properties with Pyste
by João Paulo Dec. 28, 2004

Dec. 28, 2004

Hi! How do I add a property using Pyste? It was possible with old class_code, but now it appears to be no more avaliable on pyste. I've take a look on pyste.py n Pyste package and it appears to have a add_method function, but not and add_property. Is there a way to add a property with pyste? Thanks, JP

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