Method getInverse

src/ifcparse/IfcParse.cpp:2581–2640

}

aggregate_of_instance::ptr IfcFile::getInverse(int instance_id, const IfcParse::declaration* type, int attribute_index) {
    if (type == nullptr && attribute_index == -1) {
        return instances_by_reference(instance_id);
    }

    aggregate_of_instance::ptr return_value(new aggregate_of_instance);

    visit_subtypes(type->as_entity(), [this, attribute_index, instance_id, &return_value](const IfcParse::declaration* ent) {

        std::visit([&return_value, this, attribute_index, instance_id, ent](const auto& x) {
            if constexpr (std::is_same_v<std::decay_t<decltype(x)>, std::monostate>) {
            } else if constexpr (std::is_same_v<std::decay_t<decltype(x)>, impl::in_memory_file_storage>) {
                if (attribute_index == -1) {
                    auto lower = x.byref_excl_.lower_bound({ instance_id, ent->index_in_schema(), -1 });
                    auto upper = x.byref_excl_.upper_bound({ instance_id, ent->index_in_schema(), std::numeric_limits<short>::max() });

                    for (auto it = lower; it != upper; ++it) {
                        for (auto& i : it->second) {
                            return_value->push(instance_by_id(i));
                        }
                    }
                } else {
                    auto it = x.byref_excl_.find({ instance_id, ent->index_in_schema(), attribute_index });
                    if (it != x.byref_excl_.end()) {
                        for (auto& i : it->second) {
                            return_value->push(instance_by_id(i));
                        }
                    }
                }
            }
#ifdef IFOPSH_WITH_ROCKSDB            
            else if constexpr (std::is_same_v<std::decay_t<decltype(x)>, impl::rocks_db_file_storage>) {
                if (attribute_index == -1) {
                    // @todo no lower/upper_bounds() implemented yet
                    auto prefix = "v|" + std::to_string(instance_id) + "|" + std::to_string(ent->index_in_schema()) + "|";
                    auto it = std::unique_ptr<rocksdb::Iterator>(x.db->NewIterator(rocksdb::ReadOptions()));
                    it->Seek(prefix);
                    while (it->Valid() && it->key().starts_with(prefix)) {
                        std::vector<uint32_t> vals(it->value().size() / sizeof(uint32_t));
                        memcpy(vals.data(), it->value().data(), it->value().size());
                        for (auto& v : vals) {
                            return_value->push(instance_by_id(v));
                        }
                        it->Next();
                    }
                } else {
                    auto it = x.byref_excl_.find({ instance_id, ent->index_in_schema(), attribute_index });
                    if (it != x.byref_excl_.end()) {
                        for (auto& i : it->second) {
                            return_value->push(instance_by_id(i));
                        }
                    }
                }
            }
#endif
        }, storage_);
    });