Add missing virtual destructors

tf2/include/tf2/buffer_core_interface.h

@@ -50,6 +50,10 @@ namespace tf2
 class BufferCoreInterface
 {
 public:
+  TF2_PUBLIC
+  virtual
+  ~BufferCoreInterface() = default;
+
   /**
    * \brief Clear internal state data.
    */

tf2/include/tf2/time_cache.h

@@ -48,6 +48,9 @@ typedef std::pair<TimePoint, CompactFrameID> P_TimeAndFrameID;
 class TimeCacheInterface
 {
 public:
+  TF2_PUBLIC
+  virtual ~TimeCacheInterface() = default;
+
   /** \brief Access data from the cache */
   TF2_PUBLIC
   virtual bool getData(TimePoint time, TransformStorage & data_out, std::string* error_str = 0)=0; //returns false if data unavailable (should be thrown as lookup exception

tf2_ros/include/tf2_ros/async_buffer_interface.h

@@ -51,6 +51,10 @@ using TransformReadyCallback = std::function<void(const TransformStampedFuture&)
 class AsyncBufferInterface
 {
 public:
+  TF2_ROS_PUBLIC
+  virtual
+  ~AsyncBufferInterface() = default;
+
   /**
    * \brief Wait for a transform between two frames to become available.
    * \param target_frame The frame into which to transform.

tf2_ros/include/tf2_ros/create_timer_interface.h

@@ -74,6 +74,10 @@ class CreateTimerInterface
   using ConstSharedPtr = std::shared_ptr<const CreateTimerInterface>;
   using UniquePtr = std::unique_ptr<CreateTimerInterface>;
 
+  TF2_ROS_PUBLIC
+  virtual
+  ~CreateTimerInterface() = default;
+
   /**
    * \brief Create a new timer.
    *