66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/** @file PolyForwarderUtil.hpp
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*
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* @author Roland Conybeare, Feb 2026
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**/
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#pragma once
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#include "Collector.hpp"
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#include <xo/facet/FacetRegistry.hpp>
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namespace xo {
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namespace mm {
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/** Utility class for forwarding support on
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* faceted object pointers that have some primary
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* facet _other_ than AGCObject.
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*
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* For fop with AGCObject facet, with collector gc:
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*
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* obj<ACollector> gc = ..;
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* obj<AGCObject> ptr = ..;
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*
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* gc.forward_inplace(&ptr);
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*
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* for fop with some other facet:
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*
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* obj<ASomething> ptr = ..;
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* PolyForwarderUtil::forward_inplace(gc, &ptr);
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*
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* or
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* poly_forward_inplace(gc, &ptr);
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**/
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class PolyForwarderUtil {
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public:
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template <typename AFacet, typename DRepr>
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static void forward_inplace(obj<ACollector> gc, obj<AFacet,DRepr> * p_ptr) {
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using xo::facet::FacetRegistry;
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/**
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* p_ptr
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* v FacetRegistry
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* +--------+---------+ .variant() +-----------+---------+
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* | AFacet | DRepr x | -----------------> | AGCobject | DRepr x |
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* +--------+-------|-+ +-----------+-------|-+
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* | |
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* | /-------------------------------------------/
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* | |
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* v v
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* +-------+
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* | DRepr |
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* +-------+
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**/
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auto gco = FacetRegistry::instance().variant<AGCObject,AFacet>(*p_ptr);
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gc.forward_inplace(gco.iface(), (void **)&(p_ptr->data_));
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}
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};
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template <typename AFacet, typename DRepr>
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void poly_forward_inplace(obj<ACollector> gc, obj<AFacet, DRepr> * p_ptr) {
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PolyForwarderUtil::forward_inplace(gc, p_ptr);
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}
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} /*namespace mm*/
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} /*namespace xo*/
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/* end PolyForwarderUtil.hpp */
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