20       : env_(env),  in env_()  function
38         *elapsed_ = env_->NowMicros() - start_time_;  in ~StopWatch()
40         *elapsed_ += env_->NowMicros() - start_time_;  in ~StopWatch()
50                           : (env_->NowMicros() - start_time_));  in ~StopWatch()
58       delay_start_time_ = env_->NowMicros();  in DelayStart()
64       total_delay_ += env_->NowMicros() - delay_start_time_;  in DelayStop()
76   Env* const env_;
92       : env_(env), start_(0) {  in env_()  function
98   void Start() { start_ = env_->NowNanos(); }  in Start()
101     auto now = env_->NowNanos();
110     return (env_ != nullptr) ? ElapsedNanos(reset) : 0U;
114   Env* const env_;