xo-expression: initial commit (constant + primitive)

example/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(ex1)

example/ex1/CMakeLists.txt

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+# xo-expression/example/ex1/CMakeLists.txt
+
+set(SELF_EXE xo_expression_ex1)
+set(SELF_SRCS ex1.cpp)
+
+if (XO_ENABLE_EXAMPLES)
+    xo_add_executable(${SELF_EXE} ${SELF_SRCS})
+    xo_self_dependency(${SELF_EXE} xo_expression)
+    xo_dependency(${SELF_EXE} refcnt)
+endif()
+
+# end CMakeLists.txt

example/ex1/ex1.cpp

@@ -0,0 +1,14 @@
+/** @file ex1.cpp **/
+
+#include "xo/expression/Constant.hpp"
+#include <iostream>
+
+int
+main() {
+    using xo::ast::make_constant;
+
+    auto expr = make_constant(7);
+}
+
+
+/** end ex1.cpp **/