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If the documentation for pcl::concatenatePointCloud() is correct, you cannot provide cloud as a const input and also as the output. You must provide a third cloud to be filled in the function. Then, you can set cloud = third_cloud.
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If the documentation for pcl::concatenatePointCloud() is correct, you cannot provide cloud as a const input and also as the output. You must provide a third cloud to be filled in the function. Then, you can set cloud = third_cloud.
sensor_msgs::PointCloud2 temp_cloud;
pcl::concatenatePointCloud(cloud, c_tmp, temp_cloud);
cloud = temp_cloud;
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