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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef NETD_INCLUDE_STOPWATCH_H
     18 #define NETD_INCLUDE_STOPWATCH_H
     19 
     20 #include <chrono>
     21 
     22 class Stopwatch {
     23 public:
     24     Stopwatch() : mStart(clock::now()) {}
     25 
     26     virtual ~Stopwatch() {};
     27 
     28     float timeTaken() const {
     29         return getElapsed(clock::now());
     30     }
     31 
     32     float getTimeAndReset() {
     33         const auto& now = clock::now();
     34         float elapsed = getElapsed(now);
     35         mStart = now;
     36         return elapsed;
     37     }
     38 
     39 private:
     40     typedef std::chrono::steady_clock clock;
     41     typedef std::chrono::time_point<clock> time_point;
     42     time_point mStart;
     43 
     44     float getElapsed(const time_point& now) const {
     45         using ms = std::chrono::duration<float, std::ratio<1, 1000>>;
     46         return (std::chrono::duration_cast<ms>(now - mStart)).count();
     47     }
     48 };
     49 
     50 #endif  // NETD_INCLUDE_STOPWATCH_H
     51