updated examples after efi's comments

Arrangement_on_surface_2/examples/Arrangement_on_surface_2/rational_functions.cpp

@@ -1,6 +1,5 @@
 //! \file examples/Arrangement_2/ex_rational_functions.cpp
 // Constructing an arrangement of arcs of rational functions.
-
 #include <CGAL/basic.h>
 
 #include <CGAL/CORE_BigInt.h>                      //NT
@@ -31,10 +30,10 @@ int main ()
   std::vector<Traits_2::X_monotone_curve_2>  arcs;
   
   // Create an arc supported by the polynomial y = x^4 - 6x^2 + 8,
-  // defined over the interval [-2, 2]:
+  // defined over the interval [-2.1, 2.1]:
   Polynomial_1 P1 = x*x*x*x - 6*x*x + 8;
   arcs.push_back( construct_arc(P1.begin(), P1.end(), 
-          Alg_real_1(-2), Alg_real_1(2)));
+          Alg_real_1(-2.1), Alg_real_1(2.1)));
 
   // Create an arc supported by the function y = x / (1 + x^2),
   // defined over the interval [-3, 3]:
@@ -57,7 +56,7 @@ int main ()
           Alg_real_1(-3), Alg_real_1(0)));
   
   // Construct the arrangement of the four arcs.
-  Arrangement_2      arr;
+  Arrangement_2 arr(&traits);
   insert (arr, arcs.begin(), arcs.end());
 
   // Print the arrangement size.

Arrangement_on_surface_2/examples/Arrangement_on_surface_2/unbounded_rational_functions.cpp

@@ -19,9 +19,9 @@ typedef CGAL::Arrangement_2<Traits_2>              Arrangement_2;
 int main ()
 {
   // Traits class object 
-  Traits_2 traits;
-  AK1 ak1 = traits.algebraic_kernel_d_1(); 
-  
+  AK1 ak1; 
+  Traits_2 traits(&ak1);
+    
   // constructor for rational functions 
   Traits_2::Construct_curve_2 construct
     = traits.construct_curve_2_object(); 
@@ -45,7 +45,7 @@ int main ()
   Polynomial_1 P2 = -4*x*x+3; 
   Polynomial_1 minusP2 = -P2; 
   std::vector<std::pair<Alg_real_1,int> > roots;
-  ak1.solve_1_object()(P2,std::back_inserter(roots));// [-sqrt(3)/2, sqrt(3)/2]
+  traits.algebraic_kernel_d_1()->solve_1_object()(P2,std::back_inserter(roots));// [-sqrt(3)/2, sqrt(3)/2]
   arcs.push_back(construct(P2.begin(), P2.end(), roots[0].first, roots[1].first));
   arcs.push_back(construct(minusP2.begin(),minusP2.end(), roots[0].first, roots[1].first));
 
@@ -58,7 +58,8 @@ int main ()
   arcs.push_back(construct(minusP3.begin(),minusP3.end(), Q3.begin(), Q3.end(), Alg_real_1(0), false));
 
   // Construct the arrangement of the six arcs.
-  Arrangement_2      arr;
+  //Arrangement_2 arr(&traits);
+  Arrangement_2 arr;
   insert (arr, arcs.begin(), arcs.end());
 
   // Print the arrangement size.