$1 = {<std::_Vector_base<event_t, std::allocator<event_t> >> = {
    _M_impl = {<std::allocator<event_t>> = {<__gnu_cxx::new_allocator<event_t>> = {<No data fields>}, <No data fields>}, _M_start = 0x0, _M_finish = 0x0,
      _M_end_of_storage = 0x0}}, <No data fields>}