35 void Mutate(Unit *U, size_t MaxLen) {  in Mutate()  argument
37   assert(U->size() <= MaxLen);  in Mutate()
38   if (U->empty()) {  in Mutate()
40       U->push_back(RandCh());  in Mutate()
43   assert(!U->empty());  in Mutate()
46     if (U->size() > 1) {  in Mutate()
47       U->erase(U->begin() + rand() % U->size());  in Mutate()
52     if (U->size() < MaxLen) {  in Mutate()
53       U->insert(U->begin() + rand() % U->size(), RandCh());  in Mutate()
56       size_t Idx = rand() % U->size();  in Mutate()
57       (*U)[Idx] = Ch;  in Mutate()
62       size_t Idx = rand() % U->size();  in Mutate()
63       (*U)[Idx] = FlipRandomBit((*U)[Idx]);  in Mutate()
67   assert(!U->empty());  in Mutate()