Actually
it was for point inside the polygon so it explains the
problem.
But
can I access the elements of the polygon if I declare it as
ring?
Of course, bg::model::ring is adapted to Boost.Range concept and
also has operator[]. If you had your own Ring type you could use any
methods defined in it. E.g. in my eariler email if you adapted
std::vector<Eigen::Vector2d> to a Ring concept you could of
still call any method and operator defined in std::vector.
Then
I can use the distance between the point and each segment to
finally take the smallest value.
My point was that maybe you could avoid doing it manually. I don't
know what you're planning to do exactly but since you're ignoring
the interior of a Polygon when calculating distance then maybe a
Linestring would be a better representation? You could e.g. use
bg::model::linestring<Point>.