CGAL 5.1.1  2D Minkowski Sums

#include <CGAL/Polygon_nop_decomposition_2.h>
The Polygon_nop_decomposition_2
class implements a convex decomposition of a polygon, which merely passes the input polygon to the list of output convex polygons.
It should be used when it is known that the input polygon is convex to start with.