title: How to use lambda intead of std::bind in create_subscription method in ROS2
body: <p>I am creating a small euclidean clustering node for the point cloud, utilizing PCL's implementation of the KD tree.</p>
  <p>Currently, my subscriber definition looks like this,</p>
  <pre><code>ClusteringNode::ClusteringNode(const rclcpp::NodeOptions &amp;options)
        : Node(&quot;clustering_node&quot;, options),
          cloud_subscriber_{create_subscription&lt;PointCloudMsg&gt;(
              &quot;input_cloud&quot;, 10,
              std::bind(&amp;ClusteringNode::callback, this,
                        std::placeholders::_1))},
  
  </code></pre>
  <p>the definition of KD-tree method is inside callback method and is working perfectly,</p>
  <p>Now just to improve it furthur, I want to use lambdas instead of the std::bind function here,</p>
  <p>What should be the approach here?</p>