Nevermind. I've seen the answer in a different post.

http://mail.python.org/pipermail/c++-sig/2003-September/005510.html

I think the documentation could benefit from this piece of information though.  It seems unu
sual
to me that ANSI C++ leaves the () off. Really?  It seems more logical that they appear.

Joel

--- Joel Gerard <llywelyn.geo@[...].com>  wrote:
>  Hi there,
>  
>  I'm trying to extract some wrapped objects from a python script in C++.
>  I've tried running the example from the docs to see how extract works, but
>  it wont compile:
>  
>  struct X
>  {
>     X(int x) : v(x) {}
>     int value() { return v; }
>   private:
>     int v;
>  };
>  
>  foo()
>  {
>      object x_class(
>         class_<X>("X", init<int>())
>            .def("value", &X::value))
>            ;
>  
>      // Instantiate an X object through the Python interface.
>      // Its lifetime is now managed by x_obj.
>      object x_obj = x_class(3);
>  
>      // Get a reference to the C++ object out of the Python object
>      X& x = extract<X&>(x_obj);
>      assert(x.value() == 3);
>  }
>  
>  I keep getting this error:
>  
>  d:\dev\samples\python\pythonlibtest\main.cpp(91): error C2440:
>  'initializing' : cannot convert from 'boost::python::extract<T>' to 'X &'
>          with
>          [
>              T=X &
>          ]
>  
>  
>  I'm using VC 7.  Is there something separate that I have to do to get this
>  example to compile?
>  
>  Thanks,
>  Joel
>  
>  
>  
>  
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>  C++-sig mailing list
>  C++-sig@[...].org
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