using NetworkFactorCb = double(double size, const s4u::Host* src, const s4u::Host* dst,
const std::vector<s4u::Link*>& links,
const std::unordered_set<s4u::NetZone*>& netzones);
using NetworkFactorCb = double(double size, const s4u::Host* src, const s4u::Host* dst,
const std::vector<s4u::Link*>& links,
const std::unordered_set<s4u::NetZone*>& netzones);