CGAL users discussion list

[Hanjun Kim <>]

Hi Joachim

Actually, it was installed by computer staff in my department. So, now we 
have 3.4 installed, but it still doesn't work. We installed using debian 
package, but it still doesn't work.

I tried the following code
==================
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <iostream>

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_2 Point;
typedef CGAL::Polygon_2<K> Polygon_2;
using std::cout; using std::endl;


int main()
{
  Point points[] = { Point(0,0), Point(5.1,0), Point(1,1), Point(0.5,6)};
  Polygon_2 pgn(points, points+4);

  // check if the polygon is simple.
  cout << "The polygon is " <<
    (pgn.is_simple() ? "" : "not ") << "simple." << endl;

  // check if the polygon is convex
  //cout << "The polygon is " <<
    //(pgn.is_convex() ? "" : "not ") << "convex." << endl;

  return 0;
}
====================

I compiled this using the command
$g++ abc.cpp -o abc.out

and the error is
==================
abc.cpp:1:64: error: CGAL/Exact_predicates_inexact_constructions_kernel.h: 
No such file or directory
abc.cpp:2:28: error: CGAL/Polygon_2.h: No such file or directory
abc.cpp:5: error: 'CGAL' has not been declared
abc.cpp:5: error: expected initializer before 'K'
abc.cpp:6: error: 'K' has not been declared
abc.cpp:6: error: expected initializer before 'Point'
abc.cpp:7: error: 'CGAL' has not been declared
abc.cpp:7: error: expected initializer before '<' token
abc.cpp: In function 'int main()':
abc.cpp:13: error: 'Point' was not declared in this scope
abc.cpp:13: error: expected `;' before 'points'
abc.cpp:14: error: 'Polygon_2' was not declared in this scope
abc.cpp:14: error: expected `;' before 'pgn'
abc.cpp:18: error: 'pgn' was not declared in this scope
==================

Could you please help me?

Thanks,
Hanjun




On Sat, 7 Feb 2009, Joachim Reichel wrote:

> Hi Hanjun,
>
> > I first tried Debian packages and but it didn't work well.
>
> Unfortunately, you don't say why it doesn't work. There are no known problems
> building the examples/demos in the (3.3) Debian package, so it should just 
> work.
>
> > So, I
> > downloaded the CGAL-3.3.tar.gz. (not 3.4 accidentally) and built in the
> > interactive mode.
> >
> > In the CGAL-3.3/lib folder, I have
> > README  i686_Linux-2.6_g++-4.1.2, where the second one is a directory.
>
> You never mentioned so far that you use CGAL 3.3, which is more than 18 months
> old now. Since you said "accidentally", you seem to have no particular reason 
> to
> use 3.3, right? I strongly recommend to use 3.4 then, and not to waste time on
> problems with an old version.
>
> Again, there are Debian packages for 3.4 as well and I'm not aware of any
> problems building the examples/demos (read
> /usr/share/doc/libcgal-demo/README.Debian).
>
> Joachim
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