Moved all interface headers into a 'wx' subdirectory for proper use of Doxygen path settings.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54385 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/tracker.h

@@ -0,0 +1,36 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        tracker.h
+// Purpose:     interface of wxTrackable
+// Author:      wxWidgets team
+// RCS-ID:      $Id$
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+    @class wxTrackable
+    @wxheader{tracker.h}
+
+    Add-on base class for a trackable object. This class maintains an internal
+    linked list of classes of type wxTrackerNode and calls OnObjectDestroy() on
+    them if this object is destroyed. The most common usage is by using the
+    wxWeakRef<T> class template which automates this. This class has no public
+    API. Its only use is by deriving another class from it to make it trackable.
+
+    @code
+    class MyClass: public Foo, public wxTrackable
+    {
+        // whatever
+    }
+
+    typedef wxWeakRef<MyClass> MyClassRef;
+    @endcode
+
+    @library{wxbase}
+    @category{smartpointers}
+*/
+class wxTrackable
+{
+public:
+
+};
+