[C++-sig] a boost.python question about parameter that is a pointer of instance.

[simon zhang]

http://stackoverflow.com/questions/4331599/calling-python-functions-from-c This
a simple  problem.But they are not the same.My  problem is:

boost::python::object func;
Rectangle ret;
func(&ret);   // How to make a parameter of c++ instance's pointer to a
python function.


2012/11/18 Holger Brandsmeier <brandsmeier at gmx.de>

> Have a look at
> http://stackoverflow.com/questions/4331599/calling-python-functions-from-c
>
> On Sat, Nov 17, 2012 at 4:25 PM, simon zhang <hapopen at gmail.com> wrote:
> > This is a complex problem. I provide some code.
> >
> > c++
> > =======================================
> > #include <boost/python.hpp>
> > #include <boost/python/module.hpp>
> > #include <boost/python/def.hpp>
> >
> > class Rectangle {
> > public:
> >     Rectangle();
> >     virtual ~Rectangle();
> >     void set(int lg,int wd) { long=lg; width=wd; };
> >     int area() { return long*width; } ;
> >     int long;
> >     int width;
> > }
> >
> > void runtest( boost::python::object &func ) {
> >     Rectangle rt;
> >     rt.set(2,3);
> >     func( &rt );          // The parameter is a pointer of instance.The
> > function come from python.
> > }
> >
> > BOOST_PYTHON_MODULE(ctopython) {
> >     using namespace boost::python;
> >     def("runtest",runtest);
> > }
> >
> > python
> > =======================================
> > import ctopython
> >
> > def pfunc( ret )
> >     print ret.long                   #how to get right from a C++
> instance
> >     print ret.area()
> >
> > ctopython.runtest( pfunc )    #Pass parameters that is custom python
> object
> > to c++ function
> >
> > =======================================
> > how to do?
> >
> >
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