CGAL users discussion list

[David Keller <>]

Hi,

I'm appending this here, even though it is not directly related to the 
above discussed issues:
What is required for the stream-IO of Bezier-curve-arrangements?

____

typedef CGAL::CORE_algebraic_number_traits nt_traits;
typedef nt_traits::Rational rational;
typedef nt_traits::Algebraic algebraic;
typedef CGAL::Cartesian<rational> rational_kernel;
typedef CGAL::Cartesian<algebraic> algebraic_kernel;
typedef CGAL::Arr_Bezier_curve_traits_2<rational_kernel, 
algebraic_kernel, nt_traits> traits;
typedef CGAL::Arrangement_with_history_2<traits> arrangement;

...
arrangement a;
...

std::ofstream outfile( "bezier.dat" );
outfile << a ;
____

For a first try I get stuck with some compile-time errors:

/opt/CGAL-3.3.1/include/CGAL/IO/Arr_text_formatter.h: In member function 
‘void CGAL::Arr_text_formatter<Arrangement_>::read_point(typename 
Arrangement_::Traits_2::Point_2&) [with Arrangement_ = 
CGAL::Arrangement_with_history_2<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, 
CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, 
CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > >, 
CGAL::Arr_default_dcel<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, 
CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, 
CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > > 
> >]’:
libs/bspline/test/bezier_curve.cpp:391: instantiated from here
/opt/CGAL-3.3.1/include/CGAL/IO/Arr_text_formatter.h:371: error: no 
match for ‘operator>>’ in ‘CGAL::Arr_text_formatter<Arrangement_>::in 
[with Arrangement_ = 
CGAL::Arrangement_with_history_2<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, 
CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, 
CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > >, 
CGAL::Arr_default_dcel<CGAL::Arr_Bezier_curve_traits_2<CGAL::Cartesian<CORE::BigRat>, 
CGAL::Cartesian<CORE::Expr>, CGAL::CORE_algebraic_number_traits, 
CGAL::Bezier_bounding_rational_traits<CGAL::Cartesian<CORE::BigRat> > > 
> >]() >> p’

When trying to hunt these down it seems _Bezier_point_2 is missing some 
operator>> and operator<<. I cannot find these in the distribution and 
they are likely not trivial to add from my point of view.

Kind regards,
David Keller