Minkowski sum using BSO benchmark

.gitattributes

@@ -2577,6 +2577,14 @@ Min_sphere_of_spheres_d/test_extensive/stability/maple/balls-on-boundary-3.mws -
 Min_sphere_of_spheres_d/web/figs/heuristic/excess.xfig -text svneol=unset#application/octet-stream
 Min_sphere_of_spheres_d/web/figs/mbex/mbex.xfig -text svneol=unset#application/octet-stream
 Min_sphere_of_spheres_d/web/figs/pivot/cex.xfig -text svneol=unset#application/octet-stream
+Minkowski_sum_2/benchmark/data/chain.dat -text
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+Minkowski_sum_2/benchmark/data/random2.dat -text
+Minkowski_sum_2/benchmark/data/star.dat -text
+Minkowski_sum_2/benchmark/sum_by_decomposition.cpp -text
 Minkowski_sum_2/doc_tex/Minkowski_sum_2/fig/Minkowski_sum_2.png -text
 Minkowski_sum_2/doc_tex/Minkowski_sum_2/fig/approx_offset.fig -text svneol=unset#application/octet-stream
 Minkowski_sum_2/doc_tex/Minkowski_sum_2/fig/approx_offset.gif -text svneol=unset#image/gif

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Minkowski_sum_2/benchmark/sum_by_decomposition.cpp

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+//! \file examples/Minkowski_sum_2/sum_by_decomposition.cpp
+// Computing the Minkowski sum of two non-convex polygons read from a file
+// using the small-side angle-bisector decomposition strategy.
+
+#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
+#include <CGAL/minkowski_sum_2.h>
+#include <CGAL/Small_side_angle_bisector_decomposition_2.h>
+#include <iostream>
+#include <fstream>
+
+#include <time.h>
+
+#if !defined(CGAL_MINKOWSKI_SUM_2_SERIAL) && defined(_OPENMP)   
+#include<omp.h>
+#endif
+
+#include "print_utils.h"
+
+struct Kernel : public CGAL::Exact_predicates_exact_constructions_kernel {};
+
+typedef Kernel::Point_2                               Point_2;
+typedef CGAL::Polygon_2<Kernel>                       Polygon_2;
+typedef CGAL::Polygon_with_holes_2<Kernel>            Polygon_with_holes_2;
+
+int main ()
+{
+  // Open the input file.
+  std::ifstream    in_file ("random2.dat");
+
+  if (! in_file.is_open())
+  {
+    std::cerr << "Failed to open the input file." << std::endl;
+    return (1);
+  }
+
+  // Read the two polygons from the file and compute their Minkowski sum.
+  Polygon_2   P, Q;
+
+  in_file >> P >> Q;
+  in_file.close();
+
+  // Compute the Minkowski sum using the decomposition approach.
+  CGAL::Small_side_angle_bisector_decomposition_2<Kernel>  ssab_decomp;
+
+  time_t                         s,e;
+  s = time(NULL);
+
+  #if !defined(CGAL_MINKOWSKI_SUM_2_SERIAL) && defined(_OPENMP)   
+  double start,end;
+  start = omp_get_wtime(); 
+  #endif  
+
+  Polygon_with_holes_2  sum = minkowski_sum_2 (P, Q, ssab_decomp);
+
+  #if !defined(CGAL_MINKOWSKI_SUM_2_SERIAL) && defined(_OPENMP)   
+  end = omp_get_wtime();
+  #endif
+
+  e = time(NULL);
+
+  #if !defined(CGAL_MINKOWSKI_SUM_2_SERIAL) && defined(_OPENMP)   
+  std::cout << "Done! time using omp_get_wtime() (" << end-start << " seconds)." << std::endl;
+  #endif 
+  
+  std::cout << "Done! time using time() (" << difftime(e,s) << " seconds)." << std::endl;
+
+  std::cout << "P (+) Q = "; print_polygon_with_holes (sum);
+
+  return (0);
+}