xo-gc: retire Collector.forward_inplace + mock x-gc utest

W/ MockCollector supporting AGCObjectVisitor facet

utest/IGCObjectVisitor_DMockCollector.hpp

@@ -0,0 +1,68 @@
+/** @file IGCObjectVisitor_DMockCollector.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObjectVisitor_DMockCollector.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObjectVisitor_DMockCollector.json5]
+ **/
+
+#pragma once
+
+#include "GCObjectVisitor.hpp"
+#include "DMockCollector.hpp"
+
+namespace xo { namespace mm { class IGCObjectVisitor_DMockCollector; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::mm::AGCObjectVisitor,
+                                   xo::mm::DMockCollector>
+        {
+            using ImplType = xo::mm::IGCObjectVisitor_Xfer
+              <xo::mm::DMockCollector,
+               xo::mm::IGCObjectVisitor_DMockCollector>;
+        };
+    }
+}
+
+namespace xo {
+    namespace mm {
+        /** @class IGCObjectVisitor_DMockCollector
+         **/
+        class IGCObjectVisitor_DMockCollector {
+        public:
+            /** @defgroup mm-gcobjectvisitor-dmockcollector-type-traits **/
+            ///@{
+            using Copaque = xo::mm::AGCObjectVisitor::Copaque;
+            using Opaque = xo::mm::AGCObjectVisitor::Opaque;
+            ///@}
+            /** @defgroup mm-gcobjectvisitor-dmockcollector-methods **/
+            ///@{
+            // const methods
+            /** allocation metadata for gc-aware data at address @p gco.
+@p gco must be the result of a call to collector's alloc() function **/
+            static AllocInfo alloc_info(const DMockCollector & self, void * addr);
+            /** generation to which pointer @p addr belongs, given role @p r;
+sentinel if @p addr is not owned by collector **/
+            static Generation generation_of(const DMockCollector & self, Role r, const void * addr) noexcept;
+
+            // non-const methods
+            /** allocate copy of source object at address @p src.
+Source must be owned by this collector.
+Increments object age **/
+            static void * alloc_copy(DMockCollector & self, std::byte * src);
+            /** visit child of a gc-aware object. May update child in-place! **/
+            static void visit_child(DMockCollector & self, AGCObject * iface, void ** pp_data) noexcept;
+            ///@}
+        };
+
+    } /*namespace mm*/
+} /*namespace xo*/
+
+/* end */