message: Document that only double is supported.
diff: @@ -41,7 +41,7 @@ enum : std::size_t {
  * The iteration starts with the landmark `starting point` or, if `starting point==random_starting_point`,
  * with a random landmark.
  * \tparam Distance must provide an operator() that takes 2 points (value type of the range)
  - * and returns their distance (or some more general proximity measure).
  + * and returns their distance (or some more general proximity measure) as a `double`.
  * \tparam Point_range Random access range of points.
  * \tparam PointOutputIterator Output iterator whose value type is the point type.
  * \tparam DistanceOutputIterator Output iterator for distances.
  @@ -88,6 +88,8 @@ void choose_n_farthest_points(Distance dist,
  }
  std::size_t current_number_of_landmarks = 0; // counter for landmarks
  + static_assert(std::numeric_limits<double>::has_infinity);
  + // FIXME: don't hard-code the type as double. For Epeck_d, we also want to handle types that do not have an infinity.
  const double infty = std::numeric_limits<double>::infinity(); // infinity (see next entry)
  std::vector< double > dist_to_L(nb_points, infty); // vector of current distances to L from input_pts
  