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template<typename T>
struct [[nodiscard]] InplacePointerGuard {
InplacePointerGuard(T *& ptr_) : ptr(ptr_) {}
~InplacePointerGuard()
{
if (ptr != nullptr) {
ptr->~T();
}
}
T *& ptr;
};
template<typename EventType, typename... Args>
bool publishEmplace(Args &&... args) const
{
static_assert((std::is_base_of_v<Event, EventType> && std::is_convertible_v<const EventType *, const Event *>),
"EventType must be a public subtype of Event");
auto typeIdx = Event::getStaticIndex<EventType>();
std::aligned_storage_t<sizeof(EventType), alignof(EventType)> eventStorage;
EventType *eventConstructed = nullptr;
auto guard = InplacePointerGuard(eventConstructed);
publishEmplaceImpl<EventType>(typeIdx, eventStorage, eventConstructed, std::forward<Args>(args)...);
return eventConstructed != nullptr;
}
template<typename EventType, typename... Args>
static EventType *constructEvent(std::aligned_storage_t<sizeof(EventType), alignof(EventType)> & eventStorage,
Args &&... args)
{
return std::launder(new(&eventStorage) EventType(std::forward<Args>(args)...));
}
template<typename EventType, typename... Args>
void publishEmplaceImpl(const std::type_index & typeIdx,
std::aligned_storage_t<sizeof(EventType), alignof(EventType)> & eventStorage,
EventType *& eventConstructed,
Args &&... args) const
{
if (auto it = callbacks.find(typeIdx); it != callbacks.end()) {
for (const auto & [subId, callback] : it->second) {
if (!eventConstructed) {
eventConstructed = constructEvent<EventType>(eventStorage, std::forward<Args>(args)...);
}
callback(*eventConstructed);
}
}
auto range = EventsRelation::RelationManager::getParentsRange(typeIdx);
for (auto it = range.first; it != range.second; ++it) {
if (!eventConstructed) {
publishEmplaceImpl<EventType>(it->second, eventStorage, eventConstructed, std::forward<Args>(args)...);
} else {
publishImpl(it->second, *eventConstructed);
}
}
}
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