text: // Copyright 2021 Nisaba Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #ifndef NISABA_PORT_TIMER_H_
  #define NISABA_PORT_TIMER_H_
  
  #include "absl/time/clock.h"
  #include "absl/time/time.h"
  
  namespace nisaba {
  
  // A helper class for measuring elapsed times.
  class Timer {
   public:
    Timer() : start_time_(absl::Now()) {}
  
    double ElapsedMillis() const {
      return absl::FDivDuration(absl::Now() - start_time_,
                                absl::Milliseconds(1));
    }
  
   private:
    const absl::Time start_time_;
  };
  
  }  // namespace nisaba
  
  #endif  // NISABA_PORT_TIMER_H_
  