🐞 fix: Apply copilot suggestion

Apply copilot suggestion to fix some error

Author: Tao-Sheng

registration/include/pcl/registration/impl/ndt.hpp

@@ -230,18 +230,19 @@ NormalDistributionsTransform<PointSource, PointTarget, Scalar>::computeDerivativ
     const auto& x_trans_pt = trans_cloud[idx];
 
     // Find neighbors with different search method
+    neighborhood.clear();
     switch (search_method_) {
-    case KDTREE:
+    case NeighborSearchMethod::KDTREE:
       // Radius search has been experimentally faster than direct neighbor checking.
       target_cells_.radiusSearch(x_trans_pt, resolution_, neighborhood, distances);
       break;
-    case DIRECT26:
+    case NeighborSearchMethod::DIRECT26:
       target_cells_.getNeighborhoodAtPoint(x_trans_pt, neighborhood);
       break;
-    case DIRECT7:
+    case NeighborSearchMethod::DIRECT7:
       target_cells_.getFaceNeighborsAtPoint(x_trans_pt, neighborhood);
       break;
-    case DIRECT1:
+    case NeighborSearchMethod::DIRECT1:
       target_cells_.getVoxelAtPoint(x_trans_pt, neighborhood);
       break;
     }

registration/include/pcl/registration/ndt.h

@@ -50,7 +50,7 @@
 
 namespace pcl {
 
-enum NeighborSearchMethod {
+enum class NeighborSearchMethod {
   KDTREE,   // Original
   DIRECT26, // VoxelGridCovariance::getNeighborhoodAtPoint
   DIRECT7,  // VoxelGridCovariance::getFaceNeighborsAtPoint
@@ -187,7 +187,7 @@ class NormalDistributionsTransform
   setNumberOfThreads(unsigned int nr_threads = 0);
 
   /** \brief Set neighborhood search method.
-   * \param[in] method neighborhood serach method
+   * \param[in] method neighborhood search method
    */
   inline void
   setNeighborhoodSearchMethod(const NeighborSearchMethod& method)