CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

Hi Sybren,

it seems nobody has a clue about that strange error. On your side, have you 
found out a solution for that issue?

On Thursday 04 March 2010 13:28:27 Sybren A. Stüvel wrote:
> Hi folks,
> 
> I've got a class Vector_3 that subclasses the CGAL Vector_3 class:
> 
> #include <CGAL/basic.h>
> #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
> 
> typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
> 
> class Vector_3 : public K::Vector_3 {
>    ... our own stuff ...
> }
> 
> Previously this class was only used in a static library, and worked just
> fine. Now we're moving some libraries to dynamic ones. In Linux I built
> .so files and that works fine too, but DLL files on Windows are giving me
> errors.
> 
> In order to export a class so that it's visible outside the DLL, I have to
> add __declspec(dllexport) to it. Fine by me, but when I try to export our
> Vector_3 I get this error. Does any of you have any experience with this?
> We're using the C++ compiler from Microsoft Visual Studio 2005.
> 
> Regards,
> Sybren
> 
> cl /Fointermediate\src\libs\libmath\Quaternion.obj /c
> src\libs\libmath\Quaternion.cpp /nologo /TP /Zm800 /W3
> /Ideps/boost/include /Ideps/CGAL/include
> /Ideps/CGAL/auxiliary/gmp/include /Od /D_DEBUG /RTCsu /EHsc /MDd /nologo
> /Isrc\libs /Isrc
> 
> Quaternion.cpp deps/CGAL/include\CGAL/Vector_3.h(131) : error C2664:
> 'CGAL::Vector_3<R_>
> CGAL::CartesianKernelFunctors::Construct_divided_vector_3<K>::operator
> ()(const CGAL::Vector_3<R_> &,const double &) const' : cannot convert
> parameter 2 from 'const C
> GAL::First_if_different<A,B>::Type' to 'const double &'
>         with
>         [
>             R_=CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>>,
>             K=CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>>
>         ]
>         and
>         [
>             A=double,
>             B=double
>         ]
>         Reason: cannot convert from 'const
> CGAL::First_if_different<A,B>::Type' to 'const double'
>         with
>         [
>             A=double,
>             B=double
>         ]
>         No user-defined-conversion operator available that can perform
> this conversion, or the operator cannot be called
> 
>         deps/CGAL/include\CGAL/Vector_3.h(130) : while compiling class
> template member function 'CGAL::Vector_3<R_> CGAL
> 
> ::Vector_3<R_>::operator /(const CGAL::First_if_different<A,B>::Type &)
> 
> const'
>         with
>         [
>             R_=CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>>,
>             A=double,
>             B=double
>         ]
>         c:\home\blage\src\libs\libmath\vector_3.h(26) : see reference to
> class template instantiation 'CGAL::Vector_3<R_
> 
> >' being compiled
> 
>         with
>         [
>             R_=CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>>
>         ]


-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/