xo-reader2 xo-expression2: define example working and printing

def foo : f64 = 3.141593;

include/xo/expression2/DConstant.hpp

@@ -22,6 +22,7 @@ namespace xo {
             using AAllocator = xo::mm::AAllocator;
             using AGCObject = xo::mm::AGCObject;
             using typeseq = xo::reflect::typeseq;
+            using ppindentinfo = xo::print::ppindentinfo;
 
         public:
             explicit DConstant(obj<AGCObject> value) noexcept;
@@ -45,6 +46,8 @@ namespace xo {
 
             void assign_valuetype(TypeDescr td) noexcept { typeref_.resolve(td); }
 
+            bool pretty(const ppindentinfo & ppii) const;
+
         private:
             static TypeDescr _lookup_td(typeseq tseq);
 

include/xo/expression2/detail/IPrintable_DConstant.hpp

@@ -0,0 +1,62 @@
+/** @file IPrintable_DConstant.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IPrintable_DConstant.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IPrintable_DConstant.json5]
+ **/
+
+#pragma once
+
+#include "Printable.hpp"
+#include <xo/printable2/Printable.hpp>
+#include <xo/printable2/detail/IPrintable_Xfer.hpp>
+#include "DConstant.hpp"
+
+namespace xo { namespace scm { class IPrintable_DConstant; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::print::APrintable,
+                                   xo::scm::DConstant>
+        {
+            using ImplType = xo::print::IPrintable_Xfer
+              <xo::scm::DConstant,
+               xo::scm::IPrintable_DConstant>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IPrintable_DConstant
+         **/
+        class IPrintable_DConstant {
+        public:
+            /** @defgroup scm-printable-dconstant-type-traits **/
+            ///@{
+            using ppindentinfo = xo::print::APrintable::ppindentinfo;
+            using Copaque = xo::print::APrintable::Copaque;
+            using Opaque = xo::print::APrintable::Opaque;
+            ///@}
+            /** @defgroup scm-printable-dconstant-methods **/
+            ///@{
+            // const methods
+            /** Pretty-printing support for this object.
+See [xo-indentlog/xo/indentlog/pretty.hpp] **/
+            static bool pretty(const DConstant & self, const ppindentinfo & ppii);
+
+            // non-const methods
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */