+ xo-numeric/ [WIP]

NumericDispatch.hpp

@@ -0,0 +1,44 @@
+/** @file NumericDispatch.hpp
+ *
+ *  @author Roland Conybeare, Feb 2026
+ **/
+
+#pragma once
+
+//#include <xo/facet/FacetRegistry.hpp>  // probably will need this at some point?
+#include <xo/arena/DArenaHashMap.hpp>
+#include <utility>
+
+namespace xo {
+    namespace scm {
+
+        /** type-erased arithmetic dispatch.
+         **/
+        struct NumericOps {
+            obj<ANumeric>
+        };
+
+        class NumericDispatch {
+        public:
+            using KeyType = std::pair<typeseq, typeseq>;
+            using MapType = xo::map::DArenaHashMap<KeyType, MappedType, KeyHash>
+
+            /** combine two typeseq's to get hash value **/
+            struct KeyHash {
+                std::size_t operator()(const key_type & k) const noexcept {
+                    // combine the two seqno values
+                    std::size_t h1 = std::hash<int32_t>{}(k.first.seqno());
+                    std::size_t h2 = std::hash<int32_t>{}(k.second.seqno());
+                    return h1 ^ (h2 << 1);
+                }
+            };
+
+
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end NumericDispqatch.hpp */
+
+