boost::python> exposing instances from c++

T

TheDustbustr

I'm writing a game in C++ which calls out to python for scripting. I'd like to
expose the instance of my Game class (a singleton) to python (so that the
instances of Clock, Camera, etc are available to the scripts).

I ran into trouble trying to expose a specific instance (or even a function
returning the instance). Here is a simplification of my problem in code (c++):

<code>
class A{
public:
int i;
};
class B{
public:
A a;
};
B b;
B getb() {return b;} //return the instance

int main() {
getb().a.i = 42;
return 0;}
#include <boost/python/module.hpp>
#include <boost/python/class.hpp>
#include <boost/python/def.hpp>
using namespace boost::python;
BOOST_PYTHON_MODULE(hello)
{
class_<A>("A",init<>())
.def("i", &A::i);
class_<B>("B",init<>())
.def("a", &B::a);
def("getb", getb);
}
</code>

Of course, I would be calling any python script using these classes from within
main().

This doesn't compile (using bjam with msvc). If I return by reference or
pointers in getb it gets ugly (like pages and pages of error messages). Am I
doing this the right way? How do I expose an instance to python?
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Members online

No members online now.

Forum statistics

Threads
473,744
Messages
2,569,484
Members
44,903
Latest member
orderPeak8CBDGummies

Latest Threads

Top