Re: Can't get a simple example with fstream to compile & link

Opps, I messed up when cutting and pasting my example
out of a larger sample.

The constructor shouldn't start to initialize
variables and should read:

PythonWrapper(int id) { myid = id; };

Sorry!
--- Fast Bike <cdn_pride@xxxxxxxxx> wrote:
> I have been trying this for a little while. I can do
> simple examples, but when I try to do something a
> little more complex I get litany of errors.
> 
> For example creating a simple class that uses an
> instance of fstream seems to give me trouble.
> 
> Example:
> class PythonWrapper
> {
> public:
>       PythonWrapper(int id) : { myid = id; };
> private:
>       int myid;
>       std::fstream myfile;
> };
> 
> BOOST_PYTHON_MODULE(PythonWrapper)
>     {
>       using namespace boost::python;
>       
>         scope x_class =
>         class_<PythonWrapper>("PythonWrapper",
> init<int>())
> 
>         ;
>         
>     }
> 
> Gives me:
> /usr/local/gcc_3.2/bin/g++ -c -DOTL_ODBC_UNIX
> -DOTL_STL -DOTL_ANSI_CPP -DOTL_STREAM_POOLING_ON
> PrintFileStats/PythonWrapp
> er.cpp -I/home/kstrauss/boost/boost_1_30_0
> -I/usr/local/python-2.2/include/python2.2
> PrintFileStats/PythonWrapper.cpp: In constructor 
>    `PythonWrapper::PythonWrapper(int)':
> PrintFileStats/PythonWrapper.cpp:21: no base or
> member
> initializers given 
>    following ':'
>
/usr/local/gcc_3.2/include/c++/3.2.2/bits/ios_base.h:
> In copy constructor 
>    `std::basic_ios<char, std::char_traits<char>
> >::basic_ios(const 
>    std::basic_ios<char, std::char_traits<char> >&)':
>
/home/kstrauss/boost/boost_1_30_0/boost/python/object/value_holder.hpp:111:
>   instantiated from `boost::python::objects::
> value_holder<Held>::value_holder(PyObject*, A0)
> [with
> A0 = boost::reference_wrapper<const PythonWrapper>,
> Held = PythonWr
> apper]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/object/make_instance.hpp:64:
>   instantiated from `static Holder* boost::py
> thon::objects::make_instance<T,
> Holder>::construct(void*, PyObject*,
> boost::reference_wrapper<const T>) [with T = PythonW
> rapper, Holder =
>
boost::python::objects::value_holder<PythonWrapper>]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/object/make_instance.hpp:38:
>   instantiated from `static PyObject* boost::
> python::objects::make_instance_impl<T, Holder,
> Derived>::execute(Arg&) [with Arg = const
> boost::reference_wrapper<const P
> ythonWrapper>, T = PythonWrapper, Holder =
> boost::python::objects::value_holder<PythonWrapper>,
> Derived = boost::python::
> objects::make_instance<PythonWrapper,
> boost::python::objects::value_holder<PythonWrapper>
> >]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/object/class_wrapper.hpp:27:
>   instantiated from `static PyObject* boost::
> python::objects::class_cref_wrapper<Src,
> MakeInstance>::convert(const Src&) [with Src =
> PythonWrapper, MakeInstance = boo
> st::python::objects::make_instance<PythonWrapper,
> boost::python::objects::value_holder<PythonWrapper>
> >]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/converter/as_to_python_function.hpp:31:
>   instantiated from `static PyObje
> ct*
> boost::python::converter::as_to_python_function<T,
> ToPython>::convert(const void*) [with T =
> PythonWrapper, ToPython 
> =
>
boost::python::objects::class_cref_wrapper<PythonWrapper,
> boost::python::objects::make_instance<PythonWrapper,
> boost::p
> ython::objects::value_holder<PythonWrapper> > >]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/to_python_converter.hpp:32:
>   instantiated from `boost::python::to_python_
> converter<T, Conversion>::to_python_converter()
> [with
> T = PythonWrapper, Conversion =
> boost::python::objects::class_cref_
> wrapper<PythonWrapper,
> boost::python::objects::make_instance<PythonWrapper,
> boost::python::objects::value_holder<PythonWr
> apper> > >]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/class.hpp:90:
>   instantiated from `void
> boost::python::detail::register_cl
> ass_to_python(boost::mpl::bool_<true>, SelectHolder,
> T*) [with T = PythonWrapper, SelectHolder =
> boost::python::objects::
> detail::select_value_holder<PythonWrapper,
> PythonWrapper>]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/class.hpp:478:
>   instantiated from `void boost::python::class_<T,
> X1,
> X2, 
> X3>::register_() const [with T = PythonWrapper, X1 =
> boost::python::detail::not_specified, X2 =
> boost::python::detail::no
> t_specified, X3 =
> boost::python::detail::not_specified]'
>
/home/kstrauss/boost/boost_1_30_0/boost/python/class.hpp:215:
>   instantiated from `boost::python::class_<T, X1,
> X2,
> X3>::
> class_(const char*, const
> boost::python::init_base<DerivedT>&) [with DerivedT
> =
> boost::python::init<int, boost::mpl::void
> _, boost::mpl::void_, boost::mpl::void_,
> boost::mpl::void_, boost::mpl::void_,
> boost::mpl::void_, boost::mpl::void_, boos
> t::mpl::void_, boost::mpl::void_, boost::mpl::void_,
> boost::mpl::void_, boost::mpl::void_,
> boost::mpl::void_, boost::mpl:
> :void_>, T = PythonWrapper, X1 =
> boost::python::detail::not_specified, X2 =
> boost::python::detail::not_specified, X3 = bo
> ost::python::detail::not_specified]'
> PrintFileStats/PythonWrapper.cpp:48:   instantiated
> from here
>
/usr/local/gcc_3.2/include/c++/3.2.2/bits/ios_base.h:424:
> `
>    std::ios_base::ios_base(const std::ios_base&)' is
> private
>
/home/kstrauss/boost/boost_1_30_0/boost/python/object/value_holder.hpp:111:
> within
>    this context
> /usr/local/gcc_3.2/include/c++/3.2.2/streambuf: In
> copy constructor 
>    `std::basic_filebuf<char, std::char_traits<char>
> >::basic_filebuf(const 
>    std::basic_filebuf<char, std::char_traits<char>
> >&)':
> /usr/local/gcc_3.2/include/c++/3.2.2/streambuf:479:
> `
>    std::basic_streambuf<_CharT,
> _Traits>::basic_streambuf(const 
>    std::basic_streambuf<_CharT, _Traits>&) [with
> _CharT = char, _Traits = 
>    std::char_traits<char>]' is private
>
/home/kstrauss/boost/boost_1_30_0/boost/python/object/value_holder.hpp:111:
> within
>    this context
> make: *** [PythonWrapper.o] Error 1
> 
> Obviously I'm missing something in the overall
> concept
> here. Anybody willing to give me a hand?
> 
> Thx
> 
> Karl
> 
> 
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