error: expected constructor, destructor, or type conversion before ‘(’ token PLUGINLIB_DECLARE

编译错误：

/home/star/rikirobot/catkin_ws/src/depth_camera/depthimage_to_laserscan/src/DepthImageToLaserScanNodelet.cpp:60:24: error: expected constructor, destructor, or type conversion before ‘(’ tokenPLUGINLIB_DECLARE_CLASS(depthimage_to_laserscan, DepthImageToLaserScanNodelet, depthimage_to_laserscan::DepthImageToLaserScanNodelet, nodelet::Nodelet);^
depth_camera/depthimage_to_laserscan/CMakeFiles/DepthImageToLaserScanNodelet.dir/build.make:62: recipe for target 'depth_camera/depthimage_to_laserscan/CMakeFiles/DepthImageToLaserScanNodelet.dir/src/DepthImageToLaserScanNodelet.cpp.o' failed
make[2]: *** [depth_camera/depthimage_to_laserscan/CMakeFiles/DepthImageToLaserScanNodelet.dir/src/DepthImageToLaserScanNodelet.cpp.o] Error 1
CMakeFiles/Makefile2:6307: recipe for target 'depth_camera/depthimage_to_laserscan/CMakeFiles/DepthImageToLaserScanNodelet.dir/all' failed
make[1]: *** [depth_camera/depthimage_to_laserscan/CMakeFiles/DepthImageToLaserScanNodelet.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2
Invoking "make -j1" failed

出现错误的原因是ubuntu18.04 ros melodic版本与ubuntu16.04 ros kinetic版本中，pluginlib库函数发生了变化。
解决方法：
未修改前的代码：

修改为：

PLUGINLIB_EXPORT_CLASS(depthimage_to_laserscan::DepthImageToLaserScanNodelet, nodelet::Nodelet)

再次编译，即可成功

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