CGAL users discussion list

["Max" <>]

Hello,

I have code like this:

Nef_polyhedron_3 N;
std::cin >> N;

without including <CGAL/IO/Nef_polyhedron_iostream_3.h> I get 2 link errors
instead of compile-time ones. Why?

Here's the message:

1>Linking...
1>test.obj : error LNK2001: unresolved external symbol "class 
std::basic_istream<char,struct std::char_traits<char> > & __cdecl 
CGAL::operator>><struct CGAL::Simple_cartesian<class CGAL::Gmpq>,class 
CGAL::SNC_indexed_items,bool>(class std::basic_istream<char,struct 
std::char_traits<char> > &,class CGAL::Nef_polyhedron_3<struct 
CGAL::Simple_cartesian<class CGAL::Gmpq>,class CGAL::SNC_indexed_items,bool> 
&)" 
(??$?5U?$Simple_cartesian@VGmpq@CGAL@@@CGAL@@VSNC_indexed_items@1@_N@CGAL@@YAAAV?$basic_istream@DU?$char_traits@D@std@@@std@@AAV12@AAV?$Nef_polyhedron_3@U?$Simple_cartesian@VGmpq@CGAL@@@CGAL@@VSNC_indexed_items@2@_N@0@@Z)
1>test.obj : error LNK2001: unresolved external symbol "class 
std::basic_ostream<char,struct std::char_traits<char> > & __cdecl 
CGAL::operator<<<struct CGAL::Simple_cartesian<class CGAL::Gmpq>,class 
CGAL::SNC_indexed_items,bool>(class std::basic_ostream<char,struct 
std::char_traits<char> > &,class CGAL::Nef_polyhedron_3<struct 
CGAL::Simple_cartesian<class CGAL::Gmpq>,class CGAL::SNC_indexed_items,bool> 
&)" 
(??$?6U?$Simple_cartesian@VGmpq@CGAL@@@CGAL@@VSNC_indexed_items@1@_N@CGAL@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV12@AAV?$Nef_polyhedron_3@U?$Simple_cartesian@VGmpq@CGAL@@@CGAL@@VSNC_indexed_items@2@_N@0@@Z)

Thanks for any explanation.

B/Rgds
Max