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 NETDUTILS_STOPWATCH_H 18 #define NETDUTILS_STOPWATCH_H 19 20 #include <chrono> 21 22 namespace android { 23 namespace netdutils { 24 25 class Stopwatch { 26 private: 27 using clock = std::chrono::steady_clock; 28 using time_point = std::chrono::time_point<clock>; 29 30 public: Stopwatch()31 Stopwatch() : mStart(clock::now()) {} 32 33 virtual ~Stopwatch() = default; 34 timeTaken()35 float timeTaken() const { return getElapsed(clock::now()); } 36 timeTakenUs()37 int64_t timeTakenUs() const { return getElapsedUs(clock::now()); } 38 getTimeAndReset()39 float getTimeAndReset() { 40 const auto& now = clock::now(); 41 float elapsed = getElapsed(now); 42 mStart = now; 43 return elapsed; 44 } getTimeAndResetUs()45 float getTimeAndResetUs() { 46 const auto& now = clock::now(); 47 float elapsed = getElapsedUs(now); 48 mStart = now; 49 return elapsed; 50 } 51 52 private: 53 time_point mStart; 54 getElapsed(const time_point & now)55 float getElapsed(const time_point& now) const { 56 using ms = std::chrono::duration<float, std::ratio<1, 1000>>; 57 return (std::chrono::duration_cast<ms>(now - mStart)).count(); 58 } getElapsedUs(const time_point & now)59 int64_t getElapsedUs(const time_point& now) const { 60 return (std::chrono::duration_cast<std::chrono::microseconds>(now - mStart)).count(); 61 } 62 }; 63 64 } // namespace netdutils 65 } // namespace android 66 67 #endif // NETDUTILS_STOPWATCH_H 68