Make read_WKT() work with Multipolygon_with_holes

Polygon/include/CGAL/Multipolygon_with_holes_2.h

@@ -43,7 +43,7 @@ class Multipolygon_with_holes_2 {
 
   /// polygon with holes type
   using Polygon_with_holes_2 = CGAL::Polygon_with_holes_2<Kernel, Container>;
-
+  using value_type = Polygon_with_holes_2;
   /// @}
 
   using Polygon_with_holes_container = std::deque<Polygon_with_holes_2>;
@@ -72,10 +72,19 @@ class Multipolygon_with_holes_2 {
 
   Polygon_with_holes_iterator polygons_with_holes_end() { return m_polygons.end(); }
 
+  Polygon_with_holes_iterator begin() { return m_polygons.begin(); }
+
+  Polygon_with_holes_iterator end() { return m_polygons.end(); }
+
   Polygon_with_holes_const_iterator polygons_with_holes_begin() const { return m_polygons.begin(); }
 
   Polygon_with_holes_const_iterator polygons_with_holes_end() const { return m_polygons.end(); }
 
+  Polygon_with_holes_const_iterator begin() const { return m_polygons.begin(); }
+
+  Polygon_with_holes_const_iterator end() const { return m_polygons.end(); }
+
+
   void add_polygon(const Polygon_2& pgn) { m_polygons.push_back(Polygon_with_holes_2(pgn)); }
 
   void add_polygon(Polygon_2&& pgn) { m_polygons.push_back(Polygon_with_holes_2(std::forward<Polygon_with_holes_2>(pgn))); }
@@ -84,6 +93,8 @@ class Multipolygon_with_holes_2 {
 
   void add_polygon_with_holes(Polygon_with_holes_2&& pgn) { m_polygons.emplace_back(std::move(pgn)); }
 
+  void push_back(const Polygon_with_holes_2& pgn) { m_polygons.push_back(pgn); }
+
   void erase_polygon_with_holes(Polygon_with_holes_iterator pit) { m_polygons.erase(pit); }
 
   void clear() { m_polygons.clear(); }

Polygon_repair/examples/Polygon_repair/polygons2multipolygon.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <fstream>
+#include <deque>
+
+#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
+#include <CGAL/Polygon_repair/repair.h>
+#include <CGAL/IO/WKT.h>
+
+using Kernel = CGAL::Exact_predicates_inexact_constructions_kernel;
+using Point_2 = Kernel::Point_2;
+using Polygon_2 = CGAL::Polygon_2<Kernel>;
+using Polygon_with_holes_2 = CGAL::Polygon_with_holes_2<Kernel>;
+using Multipolygon_with_holes_2 = CGAL::Multipolygon_with_holes_2<Kernel>;
+
+int main(int argc, char* argv[])
+{
+  std::ifstream in((argc > 1) ? argv[1] : CGAL::data_file_path("wkt/norway-polygons.wkt"));
+
+  typedef std::vector<Point_2> MultiPoint;
+  typedef std::vector<Point_2> LineString;
+  typedef std::deque<LineString> MultiLineString;
+
+  MultiPoint points;
+  MultiLineString polylines;
+  Multipolygon_with_holes_2 polygons;
+  CGAL::IO::read_WKT(in, points,polylines,polygons);
+
+  Multipolygon_with_holes_2 mp = CGAL::Polygon_repair::repair(polygons);
+  CGAL::IO::write_multi_polygon_WKT(std::cout, mp);
+
+  return 0;
+}