Merge pull request #4562 from SunBlack/replace_stringstream_apps

[Apps] Replace std::stringstream by std::string, part 2

apps/3d_rec_framework/include/pcl/apps/3d_rec_framework/pipeline/impl/global_nn_classifier.hpp

@@ -181,30 +181,28 @@ pcl::rec_3d_framework::GlobalNNPipeline<Distance, PointInT, FeatureT>::initializ
         if (!bf::exists(desc_dir))
           bf::create_directory(desc_dir);
 
-        std::stringstream path_view;
-        path_view << path << "/view_" << v << ".pcd";
-        pcl::io::savePCDFileBinary(path_view.str(), *processed);
-
-        std::stringstream path_pose;
-        path_pose << path << "/pose_" << v << ".txt";
-        PersistenceUtils::writeMatrixToFile(path_pose.str(),
-                                            models->at(i).poses_->at(v));
-
-        std::stringstream path_entropy;
-        path_entropy << path << "/entropy_" << v << ".txt";
-        PersistenceUtils::writeFloatToFile(path_entropy.str(),
+        const std::string path_view = path + "/view_" + std::to_string(v) + ".pcd";
+        pcl::io::savePCDFileBinary(path_view, *processed);
+
+        const std::string path_pose = path + "/pose_" + std::to_string(v) + ".txt";
+        PersistenceUtils::writeMatrixToFile(path_pose, models->at(i).poses_->at(v));
+
+        const std::string path_entropy =
+            path + "/entropy_" + std::to_string(v) + ".txt";
+        PersistenceUtils::writeFloatToFile(path_entropy,
                                            models->at(i).self_occlusions_->at(v));
 
         // save signatures and centroids to disk
         for (std::size_t j = 0; j < signatures.size(); j++) {
-          std::stringstream path_centroid;
-          path_centroid << path << "/centroid_" << v << "_" << j << ".txt";
+          const std::string path_centroid = path + "/centroid_" + std::to_string(v) +
+                                            "_" + std::to_string(j) + ".txt";
           Eigen::Vector3f centroid(centroids[j][0], centroids[j][1], centroids[j][2]);
-          PersistenceUtils::writeCentroidToFile(path_centroid.str(), centroid);
+          PersistenceUtils::writeCentroidToFile(path_centroid, centroid);
 
-          std::stringstream path_descriptor;
-          path_descriptor << path << "/descriptor_" << v << "_" << j << ".pcd";
-          pcl::io::savePCDFileBinary(path_descriptor.str(), signatures[j]);
+          const std::string path_descriptor = path + "/descriptor_" +
+                                              std::to_string(v) + "_" +
+                                              std::to_string(j) + ".pcd";
+          pcl::io::savePCDFileBinary(path_descriptor, signatures[j]);
         }
       }
     }

apps/3d_rec_framework/include/pcl/apps/3d_rec_framework/pipeline/impl/global_nn_recognizer_cvfh.hpp

@@ -153,12 +153,11 @@ pcl::rec_3d_framework::GlobalNNCVFHRecognizer<Distance, PointInT, FeatureT>::
         flann_models_.push_back(descr_model);
 
         if (use_cache_) {
-
-          std::stringstream dir_pose;
-          dir_pose << path << "/pose_" << descr_model.view_id << ".txt";
+          const std::string dir_pose =
+              path + "/pose_" + std::to_string(descr_model.view_id) + ".txt";
 
           Eigen::Matrix4f pose_matrix;
-          PersistenceUtils::readMatrixFromFile(dir_pose.str(), pose_matrix);
+          PersistenceUtils::readMatrixFromFile(dir_pose, pose_matrix);
 
           std::pair<std::string, int> pair_model_view =
               std::make_pair(models->at(i).id_, descr_model.view_id);