[Insight-users] Re: itk typemaps again !

[Brad King]

Gaetan Lehmann wrote:
> 
> Hi Brad,
> 
> I'm again with typemaps in ITK (with a little more experience than last  
> time).
> I have wrapped ImageToVTKImageFilter and VTKImageToImageFilter and have  
> sucessfully define typemaps for vtkImageExport and vtkImageData  
> (http://voxel.jouy.inra.fr/darcs/itkvtk/).
> 
> Now I try to do a little more: I want to add typemaps for  
> std::vector<...>. It's very simple with swig and works well  
> (http://www.swig.org/Doc1.3/Library.html):
> 
>   %include "std_vector.i"
>   %template(DoubleVector) std::vector<double>;
> 
> is enough to wrap vector<double>. But I can't make it work with ITK.
> The class DoubleVector is defined, so I can say the %template directive  
> does something. However, the type of object returned by an itk method 
> is  different of type of  DoubleVector.
> 
> DoubleVector ->  _p_std__vectorTdouble_t
> itk method   ->  _p_std__vectorTdouble_std__allocatorTdouble_t_t
> 
> In a pure SWIG program, this is not the case. All are of type  
> _p_std__vectorTdouble_std__allocatorTdouble_t_t.
> 
> Do you know if that difference of type can explain why typemap don't work ?
> And do you know why we have this difference of type with cableswig and 
> not  with swig alone ?

CableSwig generates the return type of the method using the results of 
GCC-XML, which will give the tempalte instantiation its full name with 
all arguments.  You are not specifying these arguments to swig, and it 
does not know about the default argument of vector.  Try specifying the 
full name to %template.  The following might be the correct syntax:

%template(DoubleVector) std::vector<double, std::allocator<double> >;

but I'm not too familiar with the swig .i syntax.

-Brad