Add missing virtual destructors

include/hpp/manipulation/graph/graph-component.hh

@@ -41,6 +41,8 @@ namespace hpp {
       class HPP_MANIPULATION_DLLAPI GraphComponent
       {
         public:
+          virtual ~GraphComponent () {};
+
           /// Get the component name.
           const std::string& name() const;
 

include/hpp/manipulation/graph/state-selector.hh

@@ -30,6 +30,8 @@ namespace hpp {
       class HPP_MANIPULATION_DLLAPI StateSelector : public GraphComponent
       {
         public:
+          virtual ~StateSelector () {};
+
           /// Create a new StateSelector.
           static StateSelectorPtr_t create(const std::string& name);
 

include/hpp/manipulation/graph/statistics.hh

@@ -95,6 +95,8 @@ namespace hpp {
       class HPP_MANIPULATION_DLLLOCAL Histogram
       {
         public:
+          virtual ~Histogram () {};
+
           virtual void add (const RoadmapNodePtr_t& node) = 0;
 
           virtual HistogramPtr_t clone () const = 0;

include/hpp/manipulation/handle.hh

@@ -31,6 +31,8 @@ namespace hpp {
     class HPP_MANIPULATION_DLLAPI Handle
     {
     public:
+      virtual ~Handle () {};
+
       /// Create constraint corresponding to a gripper grasping this object
       /// \param robot the robot that grasps the handle,
       /// \param grasp object containing the grasp information