xo-reflect: + pretty printing for xo::reflect::TypeDescr

xo-alloc/include/xo/alloc/GcStatistics.hpp

@@ -1,16 +1,16 @@
-/* GcStatistics.hpp
+/** @file GcStatistics.hpp
  *
- * author: Roland Conybeare, Aug 2025
+ *  @author Roland Conybeare, Aug 2025
- */
+ **/
 
 #pragma once
 
 #include "generation.hpp"
 #include "CircularBuffer.hpp"
-#include "xo/reflect/TypeDescr.hpp"
+#include <xo/reflect/TypeDescr.hpp>
-#include "xo/unit/quantity.hpp"
+#include <xo/unit/quantity.hpp>
-#include "xo/unit/quantity_iostream.hpp"
+#include <xo/unit/quantity_iostream.hpp>
-#include "xo/indentlog/print/pretty.hpp"
+#include <xo/indentlog/print/pretty.hpp>
 #include <ostream>
 #include <array>
 

xo-reflect/include/xo/reflect/TypeDescr.hpp

@@ -3,7 +3,8 @@
 #pragma once
 
 #include "TypeDescrExtra.hpp"
-#include "xo/cxxutil/demangle.hpp"
+#include <xo/indentlog/print/pretty.hpp>
+#include <xo/cxxutil/demangle.hpp>
 #include <iostream>
 #include <typeinfo>
 #include <unordered_map>
@@ -15,6 +16,8 @@
 #include <cassert>
 
 namespace xo {
+    namespace print { class ppindentinfo; }
+
     namespace reflect {
         class TaggedPtr;  /* see [reflect/TaggedPtr.hpp] */
 
@@ -202,6 +205,9 @@ namespace xo {
 
         /* run-time description for a native c++ type */
         class TypeDescrBase {
+        public:
+            using ppindentinfo = xo::print::ppindentinfo;
+
         public:
             /* type-description objects for a type T is unique,
              *  --> can always use its address
@@ -391,6 +397,9 @@ namespace xo {
             TypeDescr fn_arg(uint32_t i) const { return this->tdextra_->fn_arg(i); }
             bool fn_is_noexcept() const { return this->tdextra_->fn_is_noexcept(); }
 
+            /** pretty-printer support, using @p ppii **/
+            bool pretty(const ppindentinfo & ppii) const;
+
             void display(std::ostream & os) const;
             std::string display_string() const;
 
@@ -543,7 +552,6 @@ namespace xo {
             return os;
         }
 
-
         /* tag to drive overload resolution */
         struct reflected_types_printer {};
 
@@ -567,6 +575,24 @@ namespace xo {
             static TypeDescrTable s_instance;
         };
     } /*namespace reflect*/
+
+    namespace print {
+        template <>
+        struct ppdetail<xo::reflect::TypeDescrBase> {
+            static bool print_pretty(const ppindentinfo & ppii,
+                                     const xo::reflect::TypeDescrBase & td) {
+                return td.pretty(ppii);
+            }
+        };
+
+        template <>
+        struct ppdetail<xo::reflect::TypeDescr> {
+            static bool print_pretty(const ppindentinfo & ppii,
+                                     xo::reflect::TypeDescr td) {
+                return td ? td->pretty(ppii) : true;
+            }
+        };
+    } /*namespace print*/
 } /*namespace xo*/
 
 namespace std {

xo-reflect/src/reflect/TypeDescr.cpp

@@ -301,6 +301,19 @@ namespace xo {
             return this->tdextra_->child_tp(i, object);
         } /*child_tp*/
 
+        bool
+        TypeDescrBase::pretty(const ppindentinfo & ppii) const
+        {
+            return ppii.pps()->pretty_struct
+                       (ppii,
+                        "TypeDescr",
+                        refrtag("id", id_),
+                        refrtag("canonical_name", canonical_name_),
+                        refrtag("complete", complete_flag_),
+                        refrtag("metatype", this->metatype()));
+
+        }
+
         void
         TypeDescrBase::display(std::ostream & os) const
         {