[C++-sig] Re: Defining Policies for unknown data handles

[Nicodemus]

Gottfried Ganßauge wrote:

>>I don't know, the generated code seems to be ok. Perhaps someone else
>>can help?
>>    
>>
>There's something missing from the generated code: a call to the macro
>BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID
>This *must* be used to create a specialization for the type_id function.
>
>See the documentation for return_opaque_pointer.
>
>Here is an example:
>--- opaque.h ---------------><------------------------------------><---
>typedef struct opaque_ *opaque;
>
>extern opaque open_opaque();
>
>--- opaque.pyste -----------><------------------------------------><---
>f = Function('open_opaque', 'opaque.h')
>set_policy (f, return_value_policy (return_opaque_pointer))
>
>---- opaque.cpp-------------><------------------------------------><--
>// Includes
>====================================================================
>#include <boost/python.hpp>
>#include <opaque.h>
>
>// Using
>=======================================================================
>using namespace boost::python;
>
>/*****************************************************
> * THE FOLLOWING LINE SHOULD BE ADDED BY PYSTE
> */
>BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(opaque_)
>
>// Module
>======================================================================
>BOOST_PYTHON_MODULE(opaque)
>{
>    def("open_opaque", &open_opaque, return_value_policy<
>return_opaque_pointer >());
>}
>-----------------------------><------------------------------------><---
>
>Cheers,
>
>Gottfried
>  
>

Yes, I forgot about the specialization, sorry 8/. Thanks Gottfried!


Here's the generated file:

    // Includes
    ====================================================================
    #include <boost/python.hpp>
    #include <test.h>

    // Using
    =======================================================================
    using namespace boost::python;

    // Declarations
    ================================================================
    namespace  {


    BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(opaque_)

    }// namespace


    // Module
    ======================================================================
    BOOST_PYTHON_MODULE(test)
    {
        def("open_opaque", &open_opaque, return_value_policy<
    return_opaque_pointer >());
    } 


But this is producing compiler errors in my machine (Windows XP, Intel 
6.0, STLport-4.5.3):


    test.cpp
    test.cpp(13): error: "type_info" is ambiguous
      BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(opaque_)
      ^

    test.cpp(13): error: "type_id" is not a class or function template
    name in the current scope
      BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(opaque_)
      ^

    test.cpp(13): error: expected a ";"
      BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(opaque_)

    ... snip more 1452 lines of errors. 8P



I believe the code is correct, seems more like a problem with my setup. 
Any ideas?

Regards,
Nicodemus.