registered types vs existing models: within function compilation error

[daniel-j-h]

I have the following use-case: check if a linestring is within a polygon.
Coordinate system is Spherical Equatorial.

The support-matrix in the documentation says this should work.

When I use the existing Boost.Geometry linestring and polygon models the

within(linestring, polygon)

function call compiles fine. But when I'm switching out the existing Boost.Geometry linestring model with my own type (which I registered as a linestring) compilation fails.

Here is a small self-contained test case reproducing this issue:

#include <vector>

#include <boost/geometry/geometry.hpp>
#include <boost/geometry/geometries/geometries.hpp>
#include <boost/geometry/geometries/register/point.hpp>
#include <boost/geometry/geometries/register/linestring.hpp>

struct myPoint { float x, y; };
struct myLine { std::vector<myPoint> pts; };

BOOST_GEOMETRY_REGISTER_POINT_2D(myPoint, float, cs::spherical_equatorial<degree>, x, y)
BOOST_GEOMETRY_REGISTER_LINESTRING(std::vector<myPoint>)

using bgPoint = boost::geometry::model::point<float, 2, boost::geometry::cs::spherical_equatorial<boost::geometry::degree>>;
using bgPoly = boost::geometry::model::polygon<bgPoint>;

int main() {
  myLine ln;
  bgPoly ply;

  boost::geometry::within(ln.pts, ply);  // does not compile

  // but this does, although I expected this to be exactly the same
  //
  //using bgLine = boost::geometry::model::linestring<bgPoint>;
  //bgLine ln2;
  //boost::geometry::within(ln2, ply);
}

This is surprising to me since both types are spherical equatorial, float precision, degree unit. There is no semantic difference from what I can see. I expected them to behave identically.

Here is the full error log. Boost version is 1.62 beta1.
https://gist.github.com/daniel-j-h/64bae0c01caaff30c2e40d27f7a98406

[awulkiew]

Thanks!
Fix: c5b7468