[C++-sig] Boost Python: C++ struct with a function pointer

[Jim Bosch]

On Tue, 2010-03-02 at 16:39 +0530, puneet goel wrote:
> Greetings
> 
> I am boost.python newbie. I tried searching the web for a solution but
> could not find one.
> I am trying to generate Python Bindings for a C++ API. The API has
> some data structures with a set function pointers as its members.
> 
> struct foo {
> public:
>   int a, b;
>   char *str;
> 
>   int (*func1) ();
>   int (*func2) ();
> };
> 
> I am wondering if it is possible to bind this struct to Python. Let me
> know how this can be done.
> 

If you just need your Python interface to support calling those function
pointers, not adding new functions in Python, it's relatively easy.  In
particular, boost::python::make_function takes a C++ function pointer
and returns a callable Python, so you can do something like this:

namespace bp = boost::python;

bp::object foo_get_func1(foo & self) {
    return bp::make_function(self.func1);
}

bp::class_<foo>("foo")
  .add_property("func1", foo_get_func1)
  ;

I haven't tested that snippet, so it may need some tweaks.  But
hopefully it will get you started.

Jim Bosch