git subrepo clone git@github.com:Rconybea/xo-alloc2.git xo-alloc2

subrepo:
  subdir:   "xo-alloc2"
  merged:   "4039c29f"
upstream:
  origin:   "git@github.com:Rconybea/xo-alloc2.git"
  branch:   "main"
  commit:   "4039c29f"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

xo-alloc2/src/alloc2/IAllocIterator_DArenaIterator.cpp

@@ -0,0 +1,52 @@
+/** @file IAllocIterator_DArenaIterator.cpp
+ *
+ *  @author Roland Conybeare, Dec 2025
+ **/
+
+#include "arena/IAllocIterator_DArenaIterator.hpp"
+#include "AllocIterator.hpp"
+#include <xo/indentlog/scope.hpp>
+#include <cassert>
+
+namespace xo {
+    using std::byte;
+
+    namespace mm {
+        AllocInfo
+        IAllocIterator_DArenaIterator::deref(const DArenaIterator & ix) noexcept
+        {
+            return ix.deref();
+        }
+
+        cmpresult
+        IAllocIterator_DArenaIterator::compare(const DArenaIterator & ix,
+                                               const obj<AAllocIterator> & other_arg) noexcept
+        {
+            scope log(XO_DEBUG(false),
+                      xtag("&ix", &ix),
+                      xtag("ix.arena", ix.arena_), xtag("ix.pos", ix.pos_));
+
+            /* downcast from variant */
+            auto other = obj<AAllocIterator, DArenaIterator>::from(other_arg);
+
+            if (!other)
+                return cmpresult::incomparable();
+
+            DArenaIterator & other_ix = *other.data();
+
+            log && log(xtag("&other_ix", &other_ix),
+                       xtag("other_ix.arena", other_ix.arena_),
+                       xtag("other_ix.pos", other_ix.pos_));
+
+            return ix.compare(other_ix);
+        }
+
+        void
+        IAllocIterator_DArenaIterator::next(DArenaIterator & ix) noexcept
+        {
+            ix.next();
+        }
+    } /*namespace mm*/
+} /*namespace xo*/
+
+/* end IAllocIterator_DArenaIterator.cpp */