xo-expression: initial commit (constant + primitive)

src/expression/CMakeLists.txt

@@ -0,0 +1,14 @@
+# expression/CMakeLists.txt
+
+set(SELF_LIB xo_expression)
+set(SELF_SRCS
+    Expression.cpp
+    #init_reflect.cpp
+)
+
+xo_add_shared_library4(${SELF_LIB} ${PROJECT_NAME}Targets ${PROJECT_VERSION} 1 ${SELF_SRCS})
+xo_dependency(${SELF_LIB} reflect)
+#xo_dependency(${SELF_LIB} indentlog)
+#xo_dependency(${SELF_LIB} subsys)
+
+# end CMakeLists.txt

src/expression/Expression.cpp

@@ -0,0 +1,15 @@
+/* @file Expression.cpp */
+
+#include "Expression.hpp"
+
+namespace xo {
+    namespace ast {
+        std::string
+        Expression::display_string() const {
+            return tostr(*this);
+        }
+    } /*namespace ast*/
+} /*namespace xo*/
+
+
+/* end Expression.cpp */