CGAL users discussion list

[mahdavi <>]

hi,
thanks for your help ,I write follow code and error again occur,please help
me ,thanks
code is:
////////////////////////////////////////////
#include <CGAL/Lazy_exact_nt.h>
typedef CGAL::Lazy_exact_nt<CGAL::Gmpq>  NT;
K::Sphere_3 k1(Point_3(0,0,0),4.00003725);
 NT l1=sqrt(k1.squared_radius());
////////////////////////////////////////////////////////////
error :
cannot convert from 'CGAL::Null_functor::result_type' to
'CGAL::Lazy_exact_nt<ET_>'
/////////////////////////////////////////////////////

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