xo-reflect: + TypeDescr:: n_child_fixed(), fixed_child_td(i)

src/reflect/atomic/AtomicTdx.cpp

@@ -2,6 +2,7 @@
 
 #include "atomic/AtomicTdx.hpp"
 #include "TaggedPtr.hpp"
+#include "TypeDescr.hpp"
 #include <sys/types.h>
 
 namespace xo {
@@ -16,6 +17,11 @@ namespace xo {
             return TaggedPtr::universal_null();
         } /*child_tp*/
 
+        TypeDescr
+        AtomicTdx::fixed_child_td(uint32_t /*i*/) const {
+            return nullptr;
+        }
+
         std::string const &
         AtomicTdx::struct_member_name(uint32_t i) const {
             return TypeDescrExtra::struct_member_name(i);