xo-reader: + expect_formal_xs [wip - not used]

include/xo/reader/formal_arg.hpp

@@ -0,0 +1,58 @@
+/* file formal_arg.hpp
+ *
+ * author: Roland Conybeare, Aug 2024
+ */
+
+#pragma once
+
+#include "TypeDescr.hpp"
+#include "xo/indentlog/print/tag.hpp"
+
+namespace xo {
+    namespace scm {
+        /** @class formal_arg
+         *  @brief description of formal parameter in an argument list
+         *
+         *  Terminated by an argument separator ',' or rightparen ')'
+         **/
+        class formal_arg {
+        public:
+            using TypeDescr = xo::reflect::TypeDescr;
+
+        public:
+            formal_arg() = default;
+            formal_arg(const std::string & n, TypeDescr td) : name_{n}, td_{td} {}
+
+            const std::string & name() const { return name_; }
+            TypeDescr td() const { return td_; }
+
+            void assign_name(const std::string & x) { name_ = x; }
+            void assign_td(TypeDescr x) { td_ = x; }
+
+            void print(std::ostream & os) const {
+                os << "<formal_arg";
+                if (!name_.empty())
+                    os << xtag("name", name_);
+                if (td_)
+                    os << xtag("td", td_);
+                os << ">";
+            }
+
+        private:
+            /** formal parameter name **/
+            std::string name_;
+            /** type description for variable @p name **/
+            TypeDescr td_;
+        };
+
+        inline std::ostream &
+        operator<< (std::ostream & os,
+                    const formal_arg & x) {
+            x.print(os);
+            return os;
+        }
+    } /*namespace scm*/
+} /*namespace xo*/
+
+
+/* end formal_arg.hpp */