[C++-sig] Py ++ generated code contains static ...

[Alexander Eisenhuth]

Roman Yakovenko schrieb:

...

>  > I tried Py++ GUI. The generated Boost.Python C++ code couldn't be 
> compiled. Reason:
>  >
>  > (VC compile error):
>  > <file location generated code> :
>  > error C2352: 'Math::Math_E::what' : illegal call of non-static member 
> function
>  > <file location header> : see declaration of 'what'
>  >
>  > Coresponding Codesnips:
>  >
>  > <generated code> :
>  >      virtual char const * what(  ) const  {
>  >          if( bp::override func_what = this->get_override( "what" ) )
>  >              return func_what(  );
>  >          else
>  >               return Math::Math_E::what(  ); // (wrong, not static)
>  >      }
> 
> You didn't provide enough details, but I think I can make reasonable 
> assumption.
> 
> First of all "what" function belong to Math_E_wrapper class
> 
> struct Math_E_wrapper : Math::Math_E, boost::python::wrapper<Math::Math_E>
> 
> Am I right?

Yes you're right

> If so, than the line "return Math::Math_E::what(  ); " should be 
> interpreted by compiler
> as a call to base class member function. I think can fix the error by 
> changing generated
> code to be "return this->Math::Math_E::what(  );"

You ment this->Math_E::what(  );

> 
> Can you test it?

I've tested "this->Math_E::what(  )" and it compiled !
Thanks a lot for that hint.

> P.S. If it is possible than switch to MSVC 7.1 compiler. It is much better.

I know, but I cannot switch at the moment.

At stdout there are a lot of warnings like:

WARNING: void Math::XYZ_TC<long unsigned int>::GetPolar(double & pol_, double & 
pol_a, double & mer) const [member function]
 > warning W1009: The function takes as argument (name=mer, pos=2)
 > non-const reference to Python immutable type - function could not be
 > called from Python. Take a look on "Function Transformation"
 > functionality and define the transformation.


The warning say that the methode couldn't be called from python because:
- argument mer is a "in/out" argument

The solution according to Function Transformation":

1) Write wrapper code
2) Use py++ on the python side

Right?

Alexander