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@jschornak gave the right solution for your specific issue, but I just wanted to add another suggestion that would prevent this: use lambdas instead of std::bind (or boost::bind). With that your subscription would look like:

subscription_ = this->create_subscription<sensor_msgs::msg::PointCloud2>(
  "/camera/depth/color/points",
  10,
  [this](sensor_msgs::msg::PointCloud2::SharedPtr msg) { topic_callback(msg); }
);

Actually for small callbacks that allows you to implement the logic right there in place without the need of creating a separate method and pass pointers to it around:

subscription_ = this->create_subscription<sensor_msgs::msg::PointCloud2>(
  "/camera/depth/color/points",
  10,
  [this](sensor_msgs::msg::PointCloud2::SharedPtr msg) {
    RCLCPP_INFO(this->get_logger(), "I heard: '%s'", msg->data);
  }
);