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: Stopwatch()24 Stopwatch() : mStart(clock::now()) {} 25 ~Stopwatch()26 virtual ~Stopwatch() {}; 27 timeTaken()28 float timeTaken() const { 29 return getElapsed(clock::now()); 30 } 31 getTimeAndReset()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 getElapsed(const time_point & now)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