xo-alloc / xo-ordinaltree: work on dual-alloc-policy trees

include/xo/alloc/GC.hpp

@@ -318,7 +318,8 @@ namespace xo {
              *  @param rhs.     new target for @p *lhs
              **/
             virtual void assign_member(IObject * parent, IObject ** lhs, IObject* rhs) final override;
-
+            /** evacuate @p *lhs and replace with forwarding pointer **/
+            virtual void forward_inplace(IObject ** lhs) final override;
             /** during GC check for source objects owned by GC.
              *  See Object::_shallow_move.
              **/

src/alloc/GC.cpp

@@ -568,6 +568,12 @@ namespace xo {
             }
         }
 
+        void
+        GC::forward_inplace(IObject ** lhs)
+        {
+            Object::_forward_inplace(lhs, this);
+        }
+
         bool
         GC::check_owned(IObject * src) const
         {

src/alloc/Object.cpp

@@ -24,7 +24,8 @@ namespace xo {
     Object::mm = nullptr;
 
     IObject *
-    Object::_forward(IObject * src, gc::IAlloc * gc)
+    Object::_forward(IObject * src,
+                     gc::IAlloc * gc)
     {
         if (!src)
             return src;