Roland Conybeare
df0bbe1b31
Plan using to properly level GCObjectStore and MutationLogStore below Collector. [WIP] not used yet
79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/** @file AGCObjectVisitor.hpp
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*
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* Generated automagically from ingredients:
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* 1. code generator:
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* [xo-facet/codegen/genfacet]
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* arguments:
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* --input [idl/GCObjectVisitor.json5]
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* 2. jinja2 template for abstract facet .hpp file:
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* [abstract_facet.hpp.j2]
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* 3. idl for facet methods
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* [idl/GCObjectVisitor.json5]
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**/
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#pragma once
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// includes (via {facet_includes})
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#include <xo/facet/obj.hpp>
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#include <xo/facet/facet_implementation.hpp>
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#include <xo/facet/typeseq.hpp>
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// see GCObject.hpp, also in xo-alloc2/
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namespace xo { namespace mm { class AGCObject; }}
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namespace xo {
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namespace mm {
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using Copaque = const void *;
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using Opaque = void *;
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/**
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Visit a gc-aware object. Visitor can traverse and update child pointers in-place.
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**/
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class AGCObjectVisitor {
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public:
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/** @defgroup mm-gcobjectvisitor-type-traits **/
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///@{
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// types
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/** integer identifying a type **/
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using typeseq = xo::facet::typeseq;
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using Copaque = const void *;
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using Opaque = void *;
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///@}
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/** @defgroup mm-gcobjectvisitor-methods **/
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///@{
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// const methods
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/** An uninitialized AGCObjectVisitor instance will have zero vtable pointer (per {linux,osx} abi).
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* Use case for this is narrow. We go to some lengths to avoid null vtable pointers. For example
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* obj<AFacet> will have non-null vtable (via IFacet_Any) with all methods terminating.
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**/
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bool _has_null_vptr() const noexcept { return *reinterpret_cast<const void * const *>(this) == nullptr; }
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/** RTTI: unique id# for actual runtime data representation **/
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virtual typeseq _typeseq() const noexcept = 0;
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/** destroy instance @p d; calls c++ dtor only for actual runtime type; does not recover memory **/
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virtual void _drop(Opaque d) const noexcept = 0;
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// nonconst methods
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/** visit child of a gc-aware object. May update child in-place! **/
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virtual void visit_child(Opaque data, AGCObject * iface, void ** pp_data) const noexcept = 0;
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///@}
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}; /*AGCObjectVisitor*/
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/** Implementation IGCObjectVisitor_DRepr of AGCObjectVisitor for state DRepr
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* should provide a specialization:
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*
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* template <>
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* struct xo::facet::FacetImplementation<AGCObjectVisitor, DRepr> {
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* using Impltype = IGCObjectVisitor_DRepr;
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* };
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*
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* then IGCObjectVisitor_ImplType<DRepr> --> IGCObjectVisitor_DRepr
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**/
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template <typename DRepr>
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using IGCObjectVisitor_ImplType = xo::facet::FacetImplType<AGCObjectVisitor, DRepr>;
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} /*namespace mm*/
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} /*namespace xo*/
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/* AGCObjectVisitor.hpp */
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