xo-alloc xo-object: + Object.self_tp

xo-alloc/include/xo/alloc/Object.hpp

@@ -5,7 +5,7 @@
 
 #pragma once
 
-#include "xo/reflect/SelfTagging.hpp"
+#include "xo/reflect/TaggedPtr.hpp"
 #include "IAlloc.hpp"
 #include <concepts>
 #include <cstdint>
@@ -79,6 +79,9 @@ namespace xo {
      *  but cost would be an extra layer of indirection
      **/
     class Object {
+    public:
+        using TaggedPtr = xo::reflect::TaggedPtr;
+
     public:
         virtual ~Object() = default;
 
@@ -148,6 +151,12 @@ namespace xo {
          **/
         static Object * _shallow_move(Object * src, gc::GC * gc);
 
+        // Reflection support
+
+        /** tagged pointer with runtime type information
+         **/
+        virtual TaggedPtr self_tp() const = 0;
+
         // GC support
 
         /** true iff this object represents a forwarding pointer.