xo-interpreter2: scaffold repl + alloc measurement frameowkr

include/xo/alloc2/visitor/AResourceVisitor.hpp

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+/** @file AResourceVisitor.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/ResourceVisitor.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [abstract_facet.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/ResourceVisitor.json5]
+ **/
+
+#pragma once
+
+// includes (via {facet_includes})
+#include "Allocator.hpp"
+#include <xo/facet/obj.hpp>
+#include <xo/facet/facet_implementation.hpp>
+#include <xo/facet/typeseq.hpp>
+
+// {pretext} here
+
+namespace xo {
+namespace mm {
+
+using Copaque = const void *;
+using Opaque = void *;
+
+/**
+Visitor to receive measured resource consumption
+**/
+class AResourceVisitor {
+public:
+    /** @defgroup mm-resourcevisitor-type-traits **/
+    ///@{
+    // types
+    /** integer identifying a type **/
+    using typeseq = xo::facet::typeseq;
+    using Copaque = const void *;
+    using Opaque = void *;
+    /** type for length of a sequence **/
+    using size_type = std::size_t;
+    ///@}
+
+    /** @defgroup mm-resourcevisitor-methods **/
+    ///@{
+    // const methods
+    /** RTTI: unique id# for actual runtime data representation **/
+    virtual typeseq _typeseq() const noexcept = 0;
+    /** report memory consumption **/
+    virtual void on_allocator(Copaque data, obj<AAllocator> mm)  const  noexcept = 0;
+
+    // nonconst methods
+    ///@}
+}; /*AResourceVisitor*/
+
+/** Implementation IResourceVisitor_DRepr of AResourceVisitor for state DRepr
+ *  should provide a specialization:
+ *
+ *    template <>
+ *    struct xo::facet::FacetImplementation<AResourceVisitor, DRepr> {
+ *        using Impltype = IResourceVisitor_DRepr;
+ *    };
+ *
+ *  then IResourceVisitor_ImplType<DRepr> --> IResourceVisitor_DRepr
+ **/
+template <typename DRepr>
+using IResourceVisitor_ImplType = xo::facet::FacetImplType<AResourceVisitor, DRepr>;
+
+} /*namespace mm*/
+} /*namespace xo*/
+
+/* AResourceVisitor.hpp */