CGAL users discussion list

["Yajun Wang" <>]

Dear Yukie:

According to stl standard, you have to define the comparison between
FacetIterators in order to use std::map in this case.

http://www.sgi.com/tech/stl/Map.html

regards,
yalding

On 12/4/06, 

 
<>
 wrote:
> Hello,
>
>
> I use a std::map<,> in my code,
> and received a message as follows.
> < Error message 
> >**************************************************************
> ...
> c:/NAGAI/MinGW/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_function.h:227:
>  error: no match for 'operator<' in '__x < __y'
> C:/NAGAI/CGAL/CGAL-3.2.1/include/CGAL/Gmpz.h:151: note: candidates are: bool 
> CGAL::operator<(const CGAL::Gmpz&, int)
> C:/NAGAI/CGAL/CGAL-3.2.1/include/CGAL/Gmpz.h:139: note:                 bool 
> CGAL::operator<(const CGAL::Gmpz&, const CGAL::Gmpz&)
> C:/NAGAI/CGAL/CGAL-3.2.1/include/CGAL/MP_Float.h:269: note:                 bool 
> CGAL::operator<(const CGAL::MP_Float&, const CGAL::MP_Float&)
> ...
> *****************************************************************
> I think this error is related to overloading the operator '<' in CGAL.
>
>
> All of the code is long, so I'll show a part of it.
> I skipped many parts of code which I consider they mean nothing to this 
> problem.
>
> < A part of codes 
> >**************************************************************
> ...
> struct ControlPointsOfFacet{
> Point p[ 10 ];
> };
> ...
>
> class Surface{
> public:
>  Polyhedron surfaceMesh;
>  std::map< FacetIterator, ControlPointsOfFacet > controlPoint;
> ...
> }
> ...
>
>
>
> ...( in another member function of class Surface )
> Surface surface;
> ...
> FacetIterator fit = surface.surfaceMesh.facets_begin();
> ...
> ControlPointsOfFacet cp;
> cp.p[0]=Point(...);
> ...
> cp.p[9]=Point(...);
> ...
> controlPoint.insert( std::make_pair( fit, cp ) );
> ...
> *****************************************************************
>
> How can I fix this problem?
>
>
> Regards,
> Yukie NAGAI