[pypy-dev] GSoC proposal - C++ binding

Neal Becker ndbecker2 at gmail.com
Tue Mar 24 18:18:14 CET 2009

Igor Trindade Oliveira wrote:

> Hi guys,
> i was talking with some pypy guys about work in this summer in GSoC with
> C++ bindings to Pypy and i wrote a proposal and i like that you review it.
> Igor
> Problem
> Pypy are becoming one of the most used Python interpreter because it is
> easy and flexible, but we still have a big problem, it does not have any
> binding to any Graphical User Interface(GUI) and we have the second
> problem, many GUIs are wrote in C++(like Qt or WxWidgets) and Pypy can not
> access C++ code because it does not have any C API, it just can access C
> code using ctypes.
> Solution
> Many solutions had been argued but the main solution is use
> Reflex[2],which is developed at CERN (which has an incredible amount of
> C++ libraries). It is not mainly intended for writing Python bindings for
> C++ libraries but instead provides reflection capabilities for C++. The
> idea is that for every C++ shared library, an additional shared library is
> produced, which allows together with Reflex to introspect properties of
> C++ classes, methods, etc. at runtime. These facilities are then used for
> writing a small generic CPython extension module, that allows CPython to
> use any C++ library for which this reflection information was generated
> [3]. This approach is a bit similar to the ctypes module, apart from the
> fact that ctypes does not use any reflection information, but the user has
> to specify the data structures that occur in the C code herself. This
> makes it sometimes rather burdensome to write cross-platform library
> bindings. For PyPy the approach seems rather fitting: We would need to
> implement only the generic extension module(a C language interface to
> Reflex) and could then use any number of C++ libraries.
I wonder if py++ would help?

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