/*
 * Problem: boost::geometry::equals() does not compile when points are
 * compared; it does for (at least some) other geometries.
 *
 * Solution: #include <boost/geometry/strategies/agnostic/point_in_point.hpp>
 *
 * This program verifies the problem and the fix; set the XXX_* macros
 * appropriately to turn on/off the point comparison and the inclusion
 * of the strategy.  If points are not compared
 * (XXX_COMPARE_POINTS=0), this will compile; whereas, if points are
 * compared (XXX_COMPARE_POINTS=1), the strategy must be included
 * (XXX_INCLUDE_POINT_STRATEGY=1).
 *
 * Fix: presumably boost/geometry/algorithms/equals.hpp should include
 * boost/geometry/strategies/agnostic/point_in_point.hpp
 *
 * Note: I believe this same problem recurs for other algorithms,
 * e.g., intersection() and perhaps others.
 */

#define XXX_COMPARE_POINTS 1
#define XXX_INCLUDE_POINT_STRATEGY 0

#include <boost/geometry/algorithms/equals.hpp>

#include <boost/geometry/geometries/box.hpp>
#include <boost/geometry/geometries/multi_polygon.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/polygon.hpp>

#if XXX_INCLUDE_POINT_STRATEGY
// XXX - required by boost::geometry::equals() for comparing points (not other geometries)
#include <boost/geometry/strategies/agnostic/point_in_point.hpp>
#endif	// XXX_INCLUDE_POINT_STRATEGY

int main ()
{
  using point_type = boost::geometry::model::d2::point_xy<int>;
  using box_type = boost::geometry::model::box<point_type>;
  using polygon_type = boost::geometry::model::polygon<point_type>;
  using multi_polygon_type = boost::geometry::model::multi_polygon<polygon_type>;

  using boost::geometry::equals;

#if XXX_COMPARE_POINTS
  point_type point;
  equals(point,point);
#endif	// XXX_COMPARE_POINTS

  box_type box;
  equals(box,box);

  polygon_type polygon;
  equals(polygon,polygon);

  multi_polygon_type multi_polygon;
  equals(multi_polygon,multi_polygon);
}