Function contains

src/ifcparse/aggregate_of_instance.h:143–151

        return accum;
    }
    bool contains(IfcUtil::IfcBaseClass* instance) const {
        for (outer_it it = begin(); it != end(); ++it) {
            const std::vector<IfcUtil::IfcBaseClass*>& inner = *it;
            if (std::find(inner.begin(), inner.end(), instance) != inner.end()) {
                return true;
            }
        }
        return false;
    }

    template <class U>
    typename aggregate_of_aggregate_of<U>::ptr as();