How to expose...

static class data members

object x_class 
    = class_<X>("X") 
         .def( ... ) 
         ... 
         ; 
 
x_class.attr("fu") = X::fu; 
x_class.attr("bar") = X::bar; 
... 

module level objects

at module creation time

First, create those objects like

object class_X = class_<X>("X");
object x = class_X();

Second, expose them:

scope().attr("x") = x; // injects x into current scope

By default current scope is module.

at run-time

Use a function:

template <class T>
void set(const std::string& name, const T& value) {
  interpreter()->mainmodule()[name] = value;
}

Note:: interpreter() is to be added about now. Date

mutable C++ object

Perhaps you'd like the resulting Python object to contain a raw pointer to the argument? In that case, the caveat is that if the lifetime of the C++ object ends before that of the Python object, that pointer will dangle and using the Python object may cause a crash.

There is a way to do that, but it's more convoluted than it should be:

  template <class T>
  T& identity(T& x)
  {
      return x;
  }

  template <class T>
  object get_object_reference(T& x)
  {
      // build a function object around identity
      object f
          = make_function(
                  &identity<T>, return_value_policy<reference_existing_object>());

      // and call
      return f(x);
  }

"Raw" function

I want to write in python:

•     def function( *args ):
          # Mess arount with elements of args.

You can make one with the library's implementation details. Be warned that these interfaces may change, but hopefully we'll have an "official" interface for what you want to do by then.

python::objects::function_object(
    f                       // must be py_function compatible
    , 0, std::numeric_limits<unsigned>::max()  // arity range
    , python::detail::keyword_range());        // no keywords

will create a Python callable object.

f is any function pointer, function reference, or function object which can be invoked with two PyObject* arguments and returns something convertible to a PyObject*.

You can add this to your module namespace with:

scope().attr("name") = function_object(f, ... );

Now you can also

class_<foo>("foo")
    .def("bar",function_object(f, ... ) );

aswell, but not

function_object bar(f, ... );
...
class_<foo>("foo")
    .def("bar",bar);

because function_object is a function, not a class.