preparation work for implementing images support in wxButton: move wxBitmapButton methods to the base class (enhancing/completing them in the process); there are no functionality changes yet (hopefully)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61051 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/defs.h

@@ -1119,6 +1119,29 @@ template <typename T> wxDELETEA(T*& array);
 */
 #define wxDEPRECATED_INLINE(func, body)
 
+/**
+    A helper macro allowing to easily define a simple deprecated accessor.
+
+    Compared to wxDEPRECATED_INLINE() it saves a @c return statement and,
+    especially, a strangely looking semicolon inside a macro.
+
+    Example of use
+    @code
+    class wxFoo
+    {
+    public:
+        int GetValue() const { return m_value; }
+
+        // this one is deprecated because it was erroneously non-const
+        wxDEPRECATED_ACCESSOR( int GetValue(), m_value )
+
+    private:
+        int m_value;
+    };
+    @endcode
+ */
+#define wxDEPRECATED_ACCESSOR(func, what)
+
 /**
     Combination of wxDEPRECATED_BUT_USED_INTERNALLY() and wxDEPRECATED_INLINE().