[C++-sig] Boost.Python property definition question

[Michael Wild]

Hi all

I can't seem to figure out how to wrap this in Boost.Python without the
need for auxiliary functions:


#include <string>
#include <boost/python.hpp>

using std::string;
using namespace boost::python;

class A
{
  string m_s;
public:
  A(string const& s) : m_s(s) {}
  // read-only access (
  string const& s() const { return m_s; }
  // read-write access
  string& s() { return m_s; }
};

BOOST_PYTHON_MODULE(A)
{
  class_<A> ("A", init<std::string const&>())
    .add_property("s",
      // this getter works fine
      make_function(
        (string const&(A::*)()const)&A::s,
        return_value_policy<copy_const_reference>()),
      // this setter fails
      make_function(
        (string&(A::*)())&A::s,
        return_internal_reference<>()))
    ;
}

When I try to run the following:

import A
a = A.A("Hello")
a.s = "World!"

I get below error message:

ArgumentError: Python argument types in
    None.None(A, str)
did not match C++ signature:
    None(A {lvalue})


How do I solve this problem?

Thanks for any advice


Michael