Method empty

libapp2sys/prebuilt/include/google/protobuf/map.h:952–952

    }
    size_type size() const { return num_elements_; }
    bool empty() const { return size() == 0; }

    iterator find(const Key& k) { return iterator(FindHelper(k).first); }
    const_iterator find(const Key& k) const { return FindHelper(k).first; }