c++ - boost::python argument type did not match -

i export class wrapper:

#include <boost/python.hpp>  namespace {  namespace bp = boost::python;  class { public:     a(){}     virtual ~a(){}  };  struct a_wrap:     a, bp::wrapper<a>{      //ctr     a_wrap():a(){}     //dtr     ~a_wrap(){}      //func     void foo(){         pysys_writestdout("test in");     } };  a* make_a(){     return new a(); }  boost_python_module(a){      bp::class_<a_wrap, boost::noncopyable>("a_wrap", bp::init<>())         .def("foo", &a_wrap::foo)         ;      bp::def("make_a", &make_a, bp::return_value_policy<bp::manage_new_object>()); }  } 

in python:

import a = a.make_a() a.foo() 

results in error:

traceback (most recent call last):   file "<stdin>", line 1, in <module> boost.python.argumenterror: python argument types in     a_wrap.foo(a_wrap) did not match c++ signature:     foo((anonymous namespace)::a_wrap {lvalue}) 

im wondering why missmatch?

i know might unusable, exact same problem arises on similar method useable me. simplified way reproduced problem.

thanks.

you're trying do:

void foo(a_wrap* ) { }  a* = new a; foo(a); // invalid conversion a* a_wrap* 

that wouldn't work in c++ either. meant make_a return a_wrap:

a* make_a() {     return new a_wrap(); } 

that makes code work me:

>>> import >>> = a.make_a() >>> a.foo() test in>>>  >>>