Fix a bug in ClassOf which crashes Pcbnew when its argument is NULL. It fixes bug #1329364.

include/core/typeinfo.h

@@ -150,7 +150,7 @@ struct remove_pointer<T*>
 template <class T, class I>
 bool IsA(const I *aObject)
 {
-    return remove_pointer<T>::type::ClassOf(aObject);
+    return aObject && remove_pointer<T>::type::ClassOf(aObject);
 }
 
 template <class T, class I>

pcbnew/class_board.h

@@ -222,7 +222,7 @@ private:
 public:
     static inline bool ClassOf( const EDA_ITEM* aItem )
     {
-        return PCB_T == aItem->Type();
+        return aItem && PCB_T == aItem->Type();
     }
 
     void SetFileName( const wxString& aFileName ) { m_fileName = aFileName; }

pcbnew/class_board_connected_item.h

@@ -60,6 +60,9 @@ public:
 
     static inline bool ClassOf( const EDA_ITEM* aItem )
     {
+        if( aItem == NULL )
+            return false;
+
         switch( aItem->Type() )
         {
         case PCB_PAD_T:

pcbnew/class_edge_mod.h

@@ -56,7 +56,7 @@ public:
 
     static inline bool ClassOf( const EDA_ITEM* aItem )
     {
-        return PCB_MODULE_EDGE_T == aItem->Type();
+        return aItem && PCB_MODULE_EDGE_T == aItem->Type();
     }
 
     void Copy( EDGE_MODULE* source );           // copy structure

pcbnew/class_text_mod.h

@@ -68,7 +68,7 @@ public:
 
     static inline bool ClassOf( const EDA_ITEM* aItem )
     {
-        return PCB_MODULE_TEXT_T == aItem->Type();
+        return aItem && PCB_MODULE_TEXT_T == aItem->Type();
     }
 
 

pcbnew/class_track.h

@@ -82,7 +82,7 @@ class TRACK : public BOARD_CONNECTED_ITEM
 public:
     static inline bool ClassOf( const EDA_ITEM* aItem )
     {
-        return PCB_TRACE_T == aItem->Type();
+        return aItem && PCB_TRACE_T == aItem->Type();
     }
 
     BOARD_CONNECTED_ITEM* start;    // pointers to a connected item (pad or track)
@@ -382,7 +382,7 @@ public:
 
     static inline bool ClassOf( const EDA_ITEM *aItem )
     {
-        return PCB_VIA_T == aItem->Type();
+        return aItem && PCB_VIA_T == aItem->Type();
     }
 
     // Do not create a copy constructor.  The one generated by the compiler is adequate.

pcbnew/editrack.cpp

@@ -62,6 +62,7 @@ static void Abort_Create_Track( EDA_DRAW_PANEL* Panel, wxDC* DC )
 {
     PCB_EDIT_FRAME* frame = (PCB_EDIT_FRAME*) Panel->GetParent();
     BOARD* pcb = frame->GetBoard();
+
 	TRACK* track = dyn_cast<TRACK*>( frame->GetCurItem() );
 
     if( track )