xo-expression: initial commit (constant + primitive)

include/xo/expression/PrimitiveInterface.hpp

@@ -0,0 +1,35 @@
+/** @file PrimitiveInterface.hpp
+ *
+ *  Author: Roland Conybeare
+ **/
+
+#pragma once
+
+#include "ConstantInterface.hpp"
+
+//#include <cstdint>
+
+#include <type_traits>
+namespace xo {
+    namespace ast {
+        class PrimitiveInterface : public ConstantInterface {
+        public:
+            PrimitiveInterface() : ConstantInterface(exprtype::primitive) {}
+
+            /** downcast from Expression **/
+            static ref::brw<PrimitiveInterface> from(ref::brw<Expression> x) {
+                return ref::brw<PrimitiveInterface>::from(x);
+            }
+
+            virtual const std::string & name() const = 0;
+
+            //virtual TypeDescr value_td() const override = 0;
+            //virtual TaggedPtr value_tp() const override = 0;
+
+        private:
+        }; /*PrimitiveInterface*/
+    } /*namespace ast*/
+} /*namespace xo*/
+
+
+/** end PrimitiveInterface.hpp **/