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/IAllocator_Any.cpp

@@ -0,0 +1,44 @@
+/** @file IAllocator_Any.cpp
+ *
+ *  @author Roland Conybeare, Dec 2025
+ **/
+
+#include "alloc/IAllocator_Any.hpp"
+#include <iostream>
+#include <exception>
+
+namespace xo {
+    using xo::facet::DVariantPlaceholder;
+    using xo::facet::typeseq;
+    using xo::facet::valid_facet_implementation;
+
+    namespace mm {
+
+        // LCOV_EXCL_START
+        void
+        IAllocator_Any::_fatal()
+        {
+            /* control here on uninitialized IAllocator_Any.
+             * Initialized instance will have specific implementation type
+             * e.g. IAllocator_Xfer<DArena>
+             */
+
+            std::cerr << "fatal"
+                      << ": attempt to call uninitialized"
+                      << " IAllocator_Any method"
+                      << std::endl;
+
+            std::terminate();
+        }
+        // LCOV_EXCL_STOP
+
+        typeseq
+        IAllocator_Any::s_typeseq = typeseq::id<DVariantPlaceholder>();
+
+        bool
+        IAllocator_Any::_valid = valid_facet_implementation<AAllocator, IAllocator_Any>();
+
+    } /*namespace mm*/
+} /*namespace xo*/
+
+/* end IAllocator_Any.cpp */