Re: [pygccxml-development] Exposing boost::python::list

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

Thank you for problem & solution contribution :-)

On Tue, Aug 2, 2011 at 11:31 PM, Scott Sturdivant <sc...@bi...> wrote:
> As a follow on, I did get this to work by using an actual list, and not a
> pointer to one.  So the pseudocode becomes:
>
> #pramga once
> #ifndef __GCCXML__
> #include <boost/python.hpp>
> typedef boost::python::list list;
> #else
> class list {};
> #endif
>
> class MyClass {
>   public list mylist;
>   MyClass() { mylist.append(1); }
> };
>
> Then in python, I have no problems:
>
>>>> mc.mylist
> [1]
>>>> mc.append(2)
>>>> mc.mylist
> [1,2]
>
> Thanks,
>
> Scott
>
>
> On Mon, 1 Aug 2011, Scott Sturdivant wrote:
>
>> Hi,
>>
>> I'd like to have a class which as a boost::python::list as a public
>> attribute.  I know that gccxml cannot parse boost/python.hpp, so given a
>> suggestion on the mailing list archives, I have done the following:
>>
>> #pragma once
>> #ifndef __GCCXML__
>> #include <boost/python.hpp>
>> typedef boost::python::list list;
>> #else
>> class list;
>> #endif
>>
>> class MyClass {
>>  public:
>>    list * mylist;
>> };
>>
>> MyClass::MyClass()
>> {
>>  mylist = new boost::python::list();
>>  mylist.append(1);
>> }
>> MyClass::~MyClass()
>> {
>>  delete mylist;
>> }
>>
>> Py++ is able to create the bindings and it compiles fine.  However, when
>> accessing the 'mylist' attribute in python, I'm seeing the following
>> behavior:
>>
>>>>> print type(myclass.mylist)
>>
>>>>> print type(myclass.mylist)
>> Traceback (most recent call last):
>>  File "<stdin>", line 1, in <module>
>> TypeError: cannot create weak reference to 'list' object
>>>>> print type(myclass.mylist)
>> Fatal Python error: GC object already tracked
>> Aborted
>>
>> I think I'm going about this the wrong way, but am unsure of the proper way.
>> Would this be a use case for the 'inserting_code' functionality of py++?
>>
>> Thank you!
>>
>> Scott
>>
>
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