pygccxml-development

[pygccxml-development] error: cannot create pointer to reference member =?utf-8?q?=E2=80=98B=3A=3Aa=E2=80=99?=

[Neal B. <ndb...@gm...>]

hello_world.hpp:
=2D-------------
struct A {};

struct B {
  A& a;
};
=2D-------------

run through pygccxml produces:
// This file has been generated by pyplusplus.

#include "boost/python.hpp"

#include "/home/nbecker/tmp/hello_world.hpp"

namespace bp =3D boost::python;

BOOST_PYTHON_MODULE(hw){
    bp::class_< B, boost::noncopyable >( "B", bp::no_init )   =20
        .def_readonly( "a", &B::a );

    bp::class_< A >( "A" );
}

But this doesn't compile:
g++ -I /usr/include/python2.4 -I /usr/local/src/boost.cvs hello_world.py.cp=
p=20
hello_world.py.cpp: In function =E2=80=98void init_module_hw()=E2=80=99:
hello_world.py.cpp:11: error: cannot create pointer to reference member =E2=
=80=98B::a=E2=80=99

[pygccxml-development] =?WINDOWS-1252?Q?Re:_[pygccxml-development]_error:_cannot_?= =?WINDOWS-1252?Q?create_pointer_to_reference_member_=91B::a=92?=

[Roman Y. <rom...@gm...>]

On 5/22/06, Neal Becker <ndb...@gm...> wrote:
> hello_world.hpp:
> --------------
> struct A {};
>
> struct B {
>   A& a;
> };
>
> --------------
>
> run through pygccxml produces:
> // This file has been generated by pyplusplus.
>
> #include "boost/python.hpp"
>
> #include "/home/nbecker/tmp/hello_world.hpp"
>
> namespace bp =3D boost::python;
>
> BOOST_PYTHON_MODULE(hw){
>     bp::class_< B, boost::noncopyable >( "B", bp::no_init )
>         .def_readonly( "a", &B::a );
>
>     bp::class_< A >( "A" );
> }
>
> But this doesn't compile:
> g++ -I /usr/include/python2.4 -I /usr/local/src/boost.cvs hello_world.py.=
cpp
> hello_world.py.cpp: In function 'void init_module_hw()':
> hello_world.py.cpp:11: error: cannot create pointer to reference member '=
B::a'

I will fix it in a day or too. I will let you know, okay?
Thanks for bug reporting.

--=20
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/

[pygccxml-development] =?WINDOWS-1252?Q?Re:_[pygccxml-development]_error:_cannot_?= =?WINDOWS-1252?Q?create_pointer_to_reference_member_=91B::a=92?=

[Roman Y. <rom...@gm...>]

Hi Neal. I suppose you read my posts on boost.python mailing list.
If not you suggest you to read them.

Any way, I implemented the missing functionality. In your case

struct A {};

struct B {
 A& a;
};

py++ will create next code:


#include "boost/python.hpp"

#include "1.h"

namespace bp =3D boost::python;

struct B_wrapper : B, bp::wrapper< B > {

    static ::A & get_a( B& inst ) {
        return inst.a;
    }

    static void set_a( B& inst, ::A & new_value ){
        inst.a =3D new_value;
    }

};

BOOST_PYTHON_MODULE(pyplusplus){
    if( true ){
        typedef bp::class_< B_wrapper, boost::noncopyable > B_exposer_t;
        B_exposer_t B_exposer =3D B_exposer_t( "B", bp::no_init );
        bp::scope B_scope( B_exposer );
        B_exposer.def( "get_a"
                , (::A & (*)( ::B ))(&B_wrapper::get_a)
                , bp::return_value_policy<
bp::copy_non_const_reference, bp::default_call_policies >() );
        B_exposer.def( "set_a"
                , (void (*)( ::B,::A & ))(&B_wrapper::set_a)
                , bp::default_call_policies() );
    }

    bp::class_< A >( "A" );
}

You can change call policies for every function using getter_call_policies
and setter_call_policies of variable_t class.

It would be nice if you can try new functionality and report problems and/o=
r
suggestions. I did some testing, but not a full one.

Thanks

--=20
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/