解决PLUGINLIB_DECLARE_CLASS 错误

一、问题描述
在catkin_make时候报错：

error: expected constructor, destructor, or type conversion before ‘(’ token
 PLUGINLIB_DECLARE_CLASS(uvc_camera, CameraNodelet, uvc_camera::CameraNodelet, nodelet::Nodelet);

二、解决办法：
在uvc_camera的源码中/uvc_camera/src/nodelets.cpp 中找到

PLUGINLIB_DECLARE_CLASS(uvc_camera, CameraNodelet, uvc_camera::CameraNodelet, nodelet::Nodelet);
PLUGINLIB_DECLARE_CLASS(uvc_camera, StereoNodelet, uvc_camera::StereoNodelet, nodelet::Nodelet)

把这两行改成：

PLUGINLIB_EXPORT_CLASS(uvc_camera::CameraNodelet , nodelet::Nodelet);
PLUGINLIB_EXPORT_CLASS(uvc_camera::StereoNodelet , nodelet::Nodelet);

参考：
https://blog.youkuaiyun.com/lowbob/article/details/108909168