some print utility updates

cpp/include/cuspatial/experimental/geometry/segment.cuh

@@ -19,6 +19,7 @@
 #include <cuspatial/cuda_utils.hpp>
 #include <cuspatial/vec_2d.hpp>
 
+#include <iostream>
 namespace cuspatial {
 
 /**
@@ -48,6 +49,12 @@ class alignas(sizeof(Vertex)) segment {
 
   /// Return the geometric center of segment.
   Vertex CUSPATIAL_HOST_DEVICE center() const { return midpoint(v1, v2); }
+
+ private:
+  friend std::ostream& operator<<(std::ostream& os, segment<T> const& seg)
+  {
+    return os << seg.v1 << " -> " << seg.v2;
+  }
 };
 
 // deduction guide, enables CTAD

cpp/include/cuspatial_test/test_util.cuh

@@ -100,27 +100,5 @@ void print_device_range(Iter begin,
   std::cout << post;
 }
 
-/**
- * @brief Print a range of device-side data.
- *
- * @note Copies the data range to host before printing.
- *
- * @tparam Iter Iterator to device data
- * @param begin The beginning of the range to print
- * @param end The end of the range to print
- * @param pre String to print before the device data range
- * @param post String to print after the device data range
- */
-template <typename Vector>
-void print_device_vector(Vector& v, std::string_view pre = "", std::string_view post = "\n")
-{
-  using T   = typename Vector::value_type;
-  auto hvec = to_host<T>(v);
-
-  std::cout << pre;
-  std::for_each(hvec.begin(), hvec.end(), [](auto const& x) { std::cout << x << " "; });
-  std::cout << post;
-}
-
 }  // namespace test
 }  // namespace cuspatial