Fix memory leak: meta objects not destroyed

CMakeLists.txt

@@ -76,7 +76,7 @@ install(TARGETS ${PROJECT_NAME}
 install(DIRECTORY include/class_loader/
   DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION})
 
-install(PROGRAMS scripts/class_loader_headers_update.py
+catkin_install_python(PROGRAMS scripts/class_loader_headers_update.py
   DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION})
 
 if(CATKIN_ENABLE_TESTING)

include/class_loader/class_loader_core.hpp

@@ -217,7 +217,7 @@ void registerPlugin(const std::string & class_name, const std::string & base_cla
   if (factoryMap.find(class_name) != factoryMap.end()) {
     CONSOLE_BRIDGE_logWarn(
       "class_loader.impl: SEVERE WARNING!!! "
-      "A namespace collision has occured with plugin factory for class %s. "
+      "A namespace collision has occurred with plugin factory for class %s. "
       "New factory will OVERWRITE existing one. "
       "This situation occurs when libraries containing plugins are directly linked against an "
       "executable (the one running right now generating this message). "

package.xml

@@ -6,14 +6,16 @@
   <description>
     The class_loader package is a ROS-independent package for loading plugins during runtime and the foundation of the higher level ROS "pluginlib" library. class_loader utilizes the host operating system's runtime loader to open runtime libraries (e.g. .so/.dll files), introspect the library for exported plugin classes, and allows users to instantiate objects of said exported classes without the explicit declaration (i.e. header file) for those classes.
   </description>
-  <maintainer email="stevenragnarok@osrfoundation.org">Steven! Ragnarök</maintainer>
+  <maintainer email="michael@openrobotics.org">Michael Carroll</maintainer>
+  <maintainer email="geoff@openrobotics.org">Geoffrey Biggs</maintainer>
   <license>BSD</license>
 
   <url type="website">http://ros.org/wiki/class_loader</url>
   <url type="bugtracker">https://github.com/ros/class_loader/issues</url>
   <url type="repository">https://github.com/ros/class_loader</url>
 
   <author>Mirza Shah</author>
+  <author email="stevenragnarok@openrobotics.org">Steven! Ragnarök</author>
 
   <buildtool_depend version_gte="0.5.68">catkin</buildtool_depend>
 

src/class_loader_core.cpp

@@ -542,6 +542,7 @@ void unloadLibrary(const std::string & library_path, ClassLoader * loader)
           assert(library->isLoaded() == false);
           delete (library);
           itr = open_libraries.erase(itr);
+          purgeGraveyardOfMetaobjects(library_path, loader, true);
         } else {
           CONSOLE_BRIDGE_logDebug(
             "class_loader.impl: "