OTS/OTSCPP/Tools/boost/polygon/polygon_set_concept.hpp

/*
  Copyright 2008 Intel Corporation

  Use, modification and distribution are subject to the Boost Software License,
  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt).
*/
#ifndef BOOST_POLYGON_POLYGON_SET_CONCEPT_HPP
#define BOOST_POLYGON_POLYGON_SET_CONCEPT_HPP
#include "polygon_set_data.hpp"
#include "detail/polygon_simplify.hpp"
namespace boost { namespace polygon{

  template <typename T, typename T2>
  struct is_either_polygon_set_type {
    typedef typename gtl_or<typename is_polygon_set_type<T>::type, typename is_polygon_set_type<T2>::type >::type type;
  };

  template <typename T>
  struct is_any_polygon_set_type {
    typedef typename gtl_or<typename is_polygon_45_or_90_set_type<T>::type, typename is_polygon_set_type<T>::type >::type type;
  };

  template <typename polygon_set_type>
  typename enable_if< typename is_any_polygon_set_type<polygon_set_type>::type,
                       typename polygon_set_traits<polygon_set_type>::iterator_type>::type
  begin_polygon_set_data(const polygon_set_type& polygon_set) {
    return polygon_set_traits<polygon_set_type>::begin(polygon_set);
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_any_polygon_set_type<polygon_set_type>::type,
                       typename polygon_set_traits<polygon_set_type>::iterator_type>::type
  end_polygon_set_data(const polygon_set_type& polygon_set) {
    return polygon_set_traits<polygon_set_type>::end(polygon_set);
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_polygon_set_type<polygon_set_type>::type,
                       bool>::type
  clean(const polygon_set_type& polygon_set) {
    return polygon_set_traits<polygon_set_type>::clean(polygon_set);
  }

  //assign
  template <typename polygon_set_type_1, typename polygon_set_type_2>
  typename enable_if< typename gtl_and<
    typename is_mutable_polygon_set_type<polygon_set_type_1>::type,
    typename is_any_polygon_set_type<polygon_set_type_2>::type>::type,
                       polygon_set_type_1>::type &
  assign(polygon_set_type_1& lvalue, const polygon_set_type_2& rvalue) {
    if(clean(rvalue))
      polygon_set_mutable_traits<polygon_set_type_1>::set(lvalue, begin_polygon_set_data(rvalue), end_polygon_set_data(rvalue));
    else {
      polygon_set_data<typename polygon_set_traits<polygon_set_type_2>::coordinate_type> ps;
      ps.insert(begin_polygon_set_data(rvalue), end_polygon_set_data(rvalue));
      ps.clean();
      polygon_set_mutable_traits<polygon_set_type_1>::set(lvalue, ps.begin(), ps.end());
    }
    return lvalue;
  }

  //get trapezoids
  template <typename output_container_type, typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                      void>::type
  get_trapezoids(output_container_type& output, const polygon_set_type& polygon_set) {
    polygon_set_data<typename polygon_set_traits<polygon_set_type>::coordinate_type> ps;
    assign(ps, polygon_set);
    ps.get_trapezoids(output);
  }

  //get trapezoids
  template <typename output_container_type, typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                      void>::type
  get_trapezoids(output_container_type& output, const polygon_set_type& polygon_set,
                 orientation_2d orient) {
    polygon_set_data<typename polygon_set_traits<polygon_set_type>::coordinate_type> ps;
    assign(ps, polygon_set);
    ps.get_trapezoids(output, orient);
  }

  //equivalence
  template <typename polygon_set_type_1, typename polygon_set_type_2>
  typename enable_if< typename gtl_and_3 <
    typename is_any_polygon_set_type<polygon_set_type_1>::type,
    typename is_any_polygon_set_type<polygon_set_type_2>::type,
    typename is_either_polygon_set_type<polygon_set_type_1, polygon_set_type_2>::type>::type,
                       bool>::type
  equivalence(const polygon_set_type_1& lvalue,
              const polygon_set_type_2& rvalue) {
    polygon_set_data<typename polygon_set_traits<polygon_set_type_1>::coordinate_type> ps1;
    assign(ps1, lvalue);
    polygon_set_data<typename polygon_set_traits<polygon_set_type_2>::coordinate_type> ps2;
    assign(ps2, rvalue);
    return ps1 == ps2;
  }

  //clear
  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       void>::type
  clear(polygon_set_type& polygon_set) {
    polygon_set_data<typename polygon_set_traits<polygon_set_type>::coordinate_type> ps;
    assign(polygon_set, ps);
  }

  //empty
  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       bool>::type
  empty(const polygon_set_type& polygon_set) {
    if(clean(polygon_set)) return begin_polygon_set_data(polygon_set) == end_polygon_set_data(polygon_set);
    polygon_set_data<typename polygon_set_traits<polygon_set_type>::coordinate_type> ps;
    assign(ps, polygon_set);
    ps.clean();
    return ps.empty();
  }

  //extents
  template <typename polygon_set_type, typename rectangle_type>
  typename enable_if< typename gtl_and<
    typename is_mutable_polygon_set_type<polygon_set_type>::type,
    typename is_mutable_rectangle_concept<typename geometry_concept<rectangle_type>::type>::type>::type,
                       bool>::type
  extents(rectangle_type& extents_rectangle,
          const polygon_set_type& polygon_set) {
    clean(polygon_set);
    polygon_set_data<typename polygon_set_traits<polygon_set_type>::coordinate_type> ps;
    assign(ps, polygon_set);
    return ps.extents(extents_rectangle);
  }

  //area
  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::area_type>::type
  area(const polygon_set_type& polygon_set) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    typedef polygon_with_holes_data<Unit> p_type;
    typedef typename coordinate_traits<Unit>::area_type area_type;
    std::vector<p_type> polys;
    assign(polys, polygon_set);
    area_type retval = (area_type)0;
    for(std::size_t i = 0; i < polys.size(); ++i) {
      retval += area(polys[i]);
    }
    return retval;
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                      std::size_t>::type
  simplify(polygon_set_type& polygon_set, typename coordinate_traits<
           typename polygon_set_traits<polygon_set_type>::coordinate_type
           >::coordinate_distance threshold) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    typedef polygon_with_holes_data<Unit> p_type;
    std::vector<p_type> polys;
    assign(polys, polygon_set);
    std::size_t retval = 0;
    for(std::size_t i = 0; i < polys.size(); ++i) {
      retval += detail::simplify_detail::simplify(polys[i].self_.coords_,
                                                  polys[i].self_.coords_, threshold);
      for(typename std::list<polygon_data<Unit> >::iterator itrh =
            polys[i].holes_.begin(); itrh != (polys[i].holes_.end()); ++itrh) {
        retval += detail::simplify_detail::simplify((*itrh).coords_,
                                                    (*itrh).coords_, threshold);
      }
    }
    assign(polygon_set, polys);
    return retval;
  }

  template <typename polygon_set_type, typename coord_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  resize(polygon_set_type& polygon_set, coord_type resizing, bool corner_fill_arcs = false, int num_circle_segments = 0) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    clean(polygon_set);
    polygon_set_data<Unit> ps;
    assign(ps, polygon_set);
    ps.resize(resizing, corner_fill_arcs,num_circle_segments);
    assign(polygon_set, ps);
    return polygon_set;
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  bloat(polygon_set_type& polygon_set,
        typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type bloating) {
    return resize(polygon_set, bloating);
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  shrink(polygon_set_type& polygon_set,
        typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type shrinking) {
    return resize(polygon_set, -(typename polygon_set_traits<polygon_set_type>::coordinate_type)shrinking);
  }

  //interact
  template <typename polygon_set_type_1, typename polygon_set_type_2>
  typename enable_if< typename gtl_and_3 <
    typename is_any_polygon_set_type<polygon_set_type_1>::type,
    typename is_any_polygon_set_type<polygon_set_type_2>::type,
    typename is_either_polygon_set_type<polygon_set_type_1, polygon_set_type_2>::type>::type,
    polygon_set_type_1>::type&
  interact(polygon_set_type_1& polygon_set_1, const polygon_set_type_2& polygon_set_2) {
    polygon_set_data<typename polygon_set_traits<polygon_set_type_1>::coordinate_type> ps1;
    assign(ps1, polygon_set_1);
    polygon_set_data<typename polygon_set_traits<polygon_set_type_2>::coordinate_type> ps2;
    assign(ps2, polygon_set_2);
    ps1.interact(ps2);
    assign(polygon_set_1, ps1);
    return polygon_set_1;
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  scale_up(polygon_set_type& polygon_set,
           typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type factor) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    clean(polygon_set);
    polygon_set_data<Unit> ps;
    assign(ps, polygon_set);
    ps.scale_up(factor);
    assign(polygon_set, ps);
    return polygon_set;
  }

  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  scale_down(polygon_set_type& polygon_set,
             typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type factor) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    clean(polygon_set);
    polygon_set_data<Unit> ps;
    assign(ps, polygon_set);
    ps.scale_down(factor);
    assign(polygon_set, ps);
    return polygon_set;
  }

  //transform
  template <typename polygon_set_type, typename transformation_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  transform(polygon_set_type& polygon_set,
            const transformation_type& transformation) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    clean(polygon_set);
    polygon_set_data<Unit> ps;
    assign(ps, polygon_set);
    ps.transform(transformation);
    assign(polygon_set, ps);
    return polygon_set;
  }

  //keep
  template <typename polygon_set_type>
  typename enable_if< typename is_mutable_polygon_set_type<polygon_set_type>::type,
                       polygon_set_type>::type &
  keep(polygon_set_type& polygon_set,
       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::area_type min_area,
       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::area_type max_area,
       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type min_width,
       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type max_width,
       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type min_height,
       typename coordinate_traits<typename polygon_set_traits<polygon_set_type>::coordinate_type>::unsigned_area_type max_height) {
    typedef typename polygon_set_traits<polygon_set_type>::coordinate_type Unit;
    typedef typename coordinate_traits<Unit>::unsigned_area_type uat;
    std::list<polygon_with_holes_data<Unit> > polys;
    assign(polys, polygon_set);
    typename std::list<polygon_with_holes_data<Unit> >::iterator itr_nxt;
    for(typename std::list<polygon_with_holes_data<Unit> >::iterator itr = polys.begin(); itr != polys.end(); itr = itr_nxt){
      itr_nxt = itr;
      ++itr_nxt;
      rectangle_data<Unit> bbox;
      extents(bbox, *itr);
      uat pwidth = delta(bbox, HORIZONTAL);
      if(pwidth > min_width && pwidth <= max_width){
        uat pheight = delta(bbox, VERTICAL);
        if(pheight > min_height && pheight <= max_height){
          typename coordinate_traits<Unit>::area_type parea = area(*itr);
          if(parea <= max_area && parea >= min_area) {
            continue;
          }
        }
      }
      polys.erase(itr);
    }
    assign(polygon_set, polys);
    return polygon_set;
  }

  namespace operators {

  struct yes_ps_ob : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_4 < yes_ps_ob, typename is_any_polygon_set_type<geometry_type_1>::type,
                                            typename is_any_polygon_set_type<geometry_type_2>::type,
                                            typename is_either_polygon_set_type<geometry_type_1, geometry_type_2>::type>::type,
                       polygon_set_view<geometry_type_1, geometry_type_2, 0> >::type
  operator|(const geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return polygon_set_view<geometry_type_1, geometry_type_2, 0>
      (lvalue, rvalue);
  }

  struct yes_ps_op : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_4 < yes_ps_op,
    typename gtl_if<typename is_any_polygon_set_type<geometry_type_1>::type>::type,
    typename gtl_if<typename is_any_polygon_set_type<geometry_type_2>::type>::type,
    typename gtl_if<typename is_either_polygon_set_type<geometry_type_1, geometry_type_2>::type>::type>
    ::type, polygon_set_view<geometry_type_1, geometry_type_2, 0> >::type
  operator+(const geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return polygon_set_view<geometry_type_1, geometry_type_2, 0>
      (lvalue, rvalue);
  }

  struct yes_ps_os : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_4 < yes_ps_os,
    typename is_any_polygon_set_type<geometry_type_1>::type,
    typename is_any_polygon_set_type<geometry_type_2>::type,
    typename is_either_polygon_set_type<geometry_type_1, geometry_type_2>::type>::type,
                       polygon_set_view<geometry_type_1, geometry_type_2, 1> >::type
  operator*(const geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return polygon_set_view<geometry_type_1, geometry_type_2, 1>
      (lvalue, rvalue);
  }

  struct yes_ps_oa : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_4 < yes_ps_oa,
    typename is_any_polygon_set_type<geometry_type_1>::type,
    typename is_any_polygon_set_type<geometry_type_2>::type,
    typename is_either_polygon_set_type<geometry_type_1, geometry_type_2>::type>::type,
                       polygon_set_view<geometry_type_1, geometry_type_2, 1> >::type
  operator&(const geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return polygon_set_view<geometry_type_1, geometry_type_2, 1>
      (lvalue, rvalue);
  }

  struct yes_ps_ox : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_4 < yes_ps_ox,
    typename is_any_polygon_set_type<geometry_type_1>::type,
    typename is_any_polygon_set_type<geometry_type_2>::type,
    typename is_either_polygon_set_type<geometry_type_1, geometry_type_2>::type>::type,
                       polygon_set_view<geometry_type_1, geometry_type_2, 2> >::type
  operator^(const geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return polygon_set_view<geometry_type_1, geometry_type_2, 2>
      (lvalue, rvalue);
  }

  struct yes_ps_om : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
    typename enable_if< typename gtl_and_4 < yes_ps_om,
    typename gtl_if<typename is_any_polygon_set_type<geometry_type_1>::type>::type,
    typename gtl_if<typename is_any_polygon_set_type<geometry_type_2>::type>::type,
    typename gtl_if<typename is_either_polygon_set_type<geometry_type_1, geometry_type_2>::type>::type>
    ::type, polygon_set_view<geometry_type_1, geometry_type_2, 3> >::type
  operator-(const geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return polygon_set_view<geometry_type_1, geometry_type_2, 3>
      (lvalue, rvalue);
  }

  struct yes_ps_ope : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_4< yes_ps_ope, gtl_yes, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                                         typename is_any_polygon_set_type<geometry_type_2>::type>::type,
                       geometry_type_1>::type &
  operator+=(geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return self_assignment_boolean_op<geometry_type_1, geometry_type_2, 0>(lvalue, rvalue);
  }

  struct yes_ps_obe : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_3< yes_ps_obe, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                                         typename is_any_polygon_set_type<geometry_type_2>::type>::type,
                       geometry_type_1>::type &
  operator|=(geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return self_assignment_boolean_op<geometry_type_1, geometry_type_2, 0>(lvalue, rvalue);
  }

  struct yes_ps_ose : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_3< yes_ps_ose, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                                         typename is_any_polygon_set_type<geometry_type_2>::type>::type,
                       geometry_type_1>::type &
  operator*=(geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return self_assignment_boolean_op<geometry_type_1, geometry_type_2, 1>(lvalue, rvalue);
  }

  struct yes_ps_oae : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if<
    typename gtl_and_3< yes_ps_oae, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                      typename is_any_polygon_set_type<geometry_type_2>::type>::type,
    geometry_type_1>::type &
  operator&=(geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return self_assignment_boolean_op<geometry_type_1, geometry_type_2, 1>(lvalue, rvalue);
  }

  struct yes_ps_oxe : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if< typename gtl_and_3< yes_ps_oxe, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                                         typename is_any_polygon_set_type<geometry_type_2>::type>::type,
                       geometry_type_1>::type &
  operator^=(geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return self_assignment_boolean_op<geometry_type_1, geometry_type_2, 2>(lvalue, rvalue);
  }

  struct yes_ps_ome : gtl_yes {};

  template <typename geometry_type_1, typename geometry_type_2>
  typename enable_if<
    typename gtl_and_3< yes_ps_ome, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                      typename is_any_polygon_set_type<geometry_type_2>::type>::type,
    geometry_type_1>::type &
  operator-=(geometry_type_1& lvalue, const geometry_type_2& rvalue) {
    return self_assignment_boolean_op<geometry_type_1, geometry_type_2, 3>(lvalue, rvalue);
  }

  // TODO: Dafna, test these four resizing operators
  struct y_ps_rpe : gtl_yes {};

  template <typename geometry_type_1, typename coordinate_type_1>
  typename enable_if< typename gtl_and_3< y_ps_rpe, typename is_mutable_polygon_set_type<geometry_type_1>::type,
                                         typename gtl_same_type<typename geometry_concept<coordinate_type_1>::type,
                                                                coordinate_concept>::type>::type,
                       geometry_type_1>::type &
  operator+=(geometry_type_1& lvalue, coordinate_type_1 rvalue) {
    return resize(lvalue, rvalue);
  }

  struct y_ps_rme : gtl_yes {};

  template <typename geometry_type_1, typename coordinate_type_1>
  typename enable_if< typename gtl_and_3<y_ps_rme, typename gtl_if<typename is_mutable_polygon_set_type<geometry_type_1>::type>::type,
                                         typename gtl_same_type<typename geometry_concept<coordinate_type_1>::type,
                                                                coordinate_concept>::type>::type,
                       geometry_type_1>::type &
  operator-=(geometry_type_1& lvalue, coordinate_type_1 rvalue) {
    return resize(lvalue, -rvalue);
  }

  struct y_ps_rp : gtl_yes {};

  template <typename geometry_type_1, typename coordinate_type_1>
  typename enable_if< typename gtl_and_3<y_ps_rp, typename gtl_if<typename is_mutable_polygon_set_type<geometry_type_1>::type>::type,
                                        typename gtl_same_type<typename geometry_concept<coordinate_type_1>::type,
                                                               coordinate_concept>::type>
  ::type, geometry_type_1>::type
  operator+(const geometry_type_1& lvalue, coordinate_type_1 rvalue) {
    geometry_type_1 retval(lvalue);
    retval += rvalue;
    return retval;
  }

  struct y_ps_rm : gtl_yes {};

  template <typename geometry_type_1, typename coordinate_type_1>
  typename enable_if< typename gtl_and_3<y_ps_rm, typename gtl_if<typename is_mutable_polygon_set_type<geometry_type_1>::type>::type,
                                        typename gtl_same_type<typename geometry_concept<coordinate_type_1>::type,
                                                               coordinate_concept>::type>
  ::type, geometry_type_1>::type
  operator-(const geometry_type_1& lvalue, coordinate_type_1 rvalue) {
    geometry_type_1 retval(lvalue);
    retval -= rvalue;
    return retval;
  }


  } //end operators namespace

  template <typename T>
  struct view_of<polygon_45_set_concept, T> {
    typedef typename get_coordinate_type<T, typename geometry_concept<T>::type >::type coordinate_type;
    T* tp;
    std::vector<polygon_45_with_holes_data<coordinate_type> > polys;
    view_of(const T& obj) : tp(), polys() {
      std::vector<polygon_with_holes_data<coordinate_type> > gpolys;
      assign(gpolys, obj);
      for(typename std::vector<polygon_with_holes_data<coordinate_type> >::iterator itr = gpolys.begin();
          itr != gpolys.end(); ++itr) {
        polys.push_back(polygon_45_with_holes_data<coordinate_type>());
        assign(polys.back(), view_as<polygon_45_with_holes_concept>(*itr));
      }
    }
    view_of(T& obj) : tp(&obj), polys() {
      std::vector<polygon_with_holes_data<coordinate_type> > gpolys;
      assign(gpolys, obj);
      for(typename std::vector<polygon_with_holes_data<coordinate_type> >::iterator itr = gpolys.begin();
          itr != gpolys.end(); ++itr) {
        polys.push_back(polygon_45_with_holes_data<coordinate_type>());
        assign(polys.back(), view_as<polygon_45_with_holes_concept>(*itr));
      }
    }

    typedef typename std::vector<polygon_45_with_holes_data<coordinate_type> >::const_iterator iterator_type;
    typedef view_of operator_arg_type;

    inline iterator_type begin() const {
      return polys.begin();
    }

    inline iterator_type end() const {
      return polys.end();
    }

    inline orientation_2d orient() const { return HORIZONTAL; }

    inline bool clean() const { return false; }

    inline bool sorted() const { return false; }

    inline T& get() { return *tp; }
  };

  template <typename T>
  struct polygon_45_set_traits<view_of<polygon_45_set_concept, T> > {
    typedef typename view_of<polygon_45_set_concept, T>::coordinate_type coordinate_type;
    typedef typename view_of<polygon_45_set_concept, T>::iterator_type iterator_type;
    typedef view_of<polygon_45_set_concept, T> operator_arg_type;

    static inline iterator_type begin(const view_of<polygon_45_set_concept, T>& polygon_set) {
      return polygon_set.begin();
    }

    static inline iterator_type end(const view_of<polygon_45_set_concept, T>& polygon_set) {
      return polygon_set.end();
    }

    static inline orientation_2d orient(const view_of<polygon_45_set_concept, T>& polygon_set) {
      return polygon_set.orient(); }

    static inline bool clean(const view_of<polygon_45_set_concept, T>& polygon_set) {
      return polygon_set.clean(); }

    static inline bool sorted(const view_of<polygon_45_set_concept, T>& polygon_set) {
      return polygon_set.sorted(); }

  };

  template <typename T>
  struct geometry_concept<view_of<polygon_45_set_concept, T> > {
    typedef polygon_45_set_concept type;
  };

  template <typename T>
  struct get_coordinate_type<view_of<polygon_45_set_concept, T>, polygon_45_set_concept> {
    typedef typename view_of<polygon_45_set_concept, T>::coordinate_type type;
  };
  template <typename T>
  struct get_iterator_type_2<view_of<polygon_45_set_concept, T>, polygon_45_set_concept> {
    typedef typename view_of<polygon_45_set_concept, T>::iterator_type type;
    static type begin(const view_of<polygon_45_set_concept, T>& t) { return t.begin(); }
    static type end(const view_of<polygon_45_set_concept, T>& t) { return t.end(); }
  };
}
}
#endif