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storage: support chained constructors i.e. parent-to-child propagation

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This commit is contained in:
Michele Caini
2022-01-13 12:00:15 +01:00
parent 588c056205
commit 8a19e8dafe
2 changed files with 41 additions and 18 deletions
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22
src/entt/entity/storage.hpp
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@@ -638,25 +638,23 @@ public:
*/
template<typename... Args>
value_type &emplace(const entity_type entt, Args &&...args) {
const auto pos = base_type::slot();
auto elem = assure_at_least(pos);
if constexpr(std::is_aggregate_v<value_type>) {
alloc_traits::construct(packed.second(), to_address(elem), Type{std::forward<Args>(args)...});
} else {
alloc_traits::construct(packed.second(), to_address(elem), std::forward<Args>(args)...);
}
// support chained constructors i.e. parent-to-child propagation
base_type::try_emplace(entt);
const auto pos = base_type::index(entt);
ENTT_TRY {
base_type::try_emplace(entt);
ENTT_ASSERT(pos == base_type::index(entt), "Misplaced component");
if constexpr(std::is_aggregate_v<value_type>) {
alloc_traits::construct(packed.second(), to_address(assure_at_least(pos)), Type{std::forward<Args>(args)...});
} else {
alloc_traits::construct(packed.second(), to_address(assure_at_least(pos)), std::forward<Args>(args)...);
}
}
ENTT_CATCH {
std::destroy_at(std::addressof(*elem));
base_type::try_erase(entt);
ENTT_THROW;
}
return *elem;
return element_at(pos);
}
/**