// TODO, use std::unordered_set with heterogeneous comparison lookup (C++14)
xbt_dict_t /* <hostname, NULL> */ hostnames_;
// This is the parent snapshot of the current state:
// TODO, use std::unordered_set with heterogeneous comparison lookup (C++14)
xbt_dict_t /* <hostname, NULL> */ hostnames_;
// This is the parent snapshot of the current state: