Function read_id_

src/ifcparse/storage.h:452–465

                static constexpr char prefix_[] = "t|";

                boost::optional<size_t> read_id_() const {
#ifdef IFOPSH_WITH_ROCKSDB
                    auto sv = state_->key().ToStringView();
                    auto ii = sv.find("|", 2);
                    if (ii != decltype(sv)::npos) {
                        char* pEnd;
                        long result = strtol(sv.data() + 2, &pEnd, 10);
                        if (*pEnd == '|') {
                            return (size_t)result;
                        }
                    }
#endif
                    return boost::none;
                }
            public:
                using iterator_category = std::forward_iterator_tag;
                using value_type = const IfcParse::declaration*;