Mailman 3 December 2004 - Cplusplus-sig

bypassing boost::python's keyword handling
by Garrick Meeker Dec. 2, 2004

Dec. 2, 2004

Is it possible to use boost to wrap a function that expects args and keywords as two PyObject's? This is old C-style Python code that could be written but the python syntax must be the same. Imagine I'm implementing some sort of dictionary class in C++. The easiest way might be to wrap this in python, so this may be purely an academic question. Something like: void f(PyObject *args, PyObject *kw); def("f_base", &f); def f(*args, **kw): f_base(args, kw) f(a=1, b=2, c=3)

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how to specify a class with 2 types of iterators
by Alexis H. Rivera-Rios Dec. 2, 2004

Dec. 2, 2004

Hi, Say I have a class like the following: class Mesh { VertexIterator VerticesBegin(); VertexIterator VerticesEnd(); FaceIterator FacesBegin(); FaceIterator FacesEnd(); }; I want to export these iterators the "python way" so I'm doing something like this (trying to follow the example in the tutorial): class_< Mesh, boost::noncopyable >("Mesh") .add_property("Faces", range(&Mesh::FacesBegin, &Mesh::FacesEnd)) .add_property("Vertices", range(&Mesh::VerticesBegin, &Mesh::VerticesEnd)) ; When I try to do something like this in Python: for v in mesh.Vertices(): print v.SomeMethod() I get an error that says: TypeError: 'iterator' object is not callable I suppose it has to do with not defining the __iter__ function, but how can I do that for two different iterators? Definetly, I'm missing something. (By the way, I couldn't compile the code using the commands from the tutorial ie. using .property instead of .add_property above) I'll appreciate your help, Alexis ===== Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com

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new pyste problem with boost v1.32.0
by Jeffrey Holle Dec. 2, 2004

Dec. 2, 2004

In running pyste against my python extension module I am running into compilation errors in the pyste generated code that is a new feature of 1.32.0. The problem is that for methods that have a default parameter, like: void setConst(bool val = true); pyste will generate two BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS statements where only one is needed. Can someone point out the python script change that will fix this?

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can I add properties and python iterator support using pyste?
by Alexis H. Rivera-Rios Dec. 1, 2004

Dec. 1, 2004

Hi I want to add python iterator support to a class. The boost.python documentation says that I can do this: class_<F>("Field") .property("pions", range(&F::p_begin, &F::p_end)) .property("bogons", range(&F::b_begin, F::b_end)); Is there an equivalent command in Pyste? I didn't find any. Thanks, Alexis ===== Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com

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C++ new/delete with python
by Chris Targett Dec. 1, 2004

Dec. 1, 2004

I've got some code. class test { test(*int); int *objects; }; objects = new int[10]; I want to expose my class `test` to python via Boost, Is there anything special I have to do to get this to expose properly? I'm not too fussed about the constructor but if its workable then thats cool. Is it possible to have a `new` defined array work within python? Thanks

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