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xo-facet: runtime facet lookup [PROTO]

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This commit is contained in:
Roland Conybeare 2026-01-09 10:07:20 -05:00
commit fe4fc4a28d
5 changed files with 86 additions and 3 deletions
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16
include/xo/facet/OObject.hpp
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@ -78,6 +78,22 @@ namespace xo {
memcpy(&(iface_[0]), (void*)&tmp, sizeof(ISpecific));
}
/**
* Runtime polymorphism:
* Create variant for specific interface @p impl
* with type-erased data @p data.
*
* Implements
* obj<AFacet>::variant(iface, data)
**/
OObject(const AFacet * impl, void * data)
requires std::is_same_v<DRepr, DVariantPlaceholder>
: data_{reinterpret_cast<DVariantPlaceholder*>(data)}
{
static_assert(sizeof(ISpecific) == sizeof(impl));
memcpy(&(iface_[0]), (void*)impl, sizeof(ISpecific));
}
OObject(const OObject & oother) {
_launder_from(oother);
}