1 // Copyright Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS-IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 16 #ifndef S2_BASE_TIMER_H_ 17 #define S2_BASE_TIMER_H_ 18 19 #include <chrono> 20 21 #include "s2/base/integral_types.h" 22 23 class CycleTimer { 24 public: 25 CycleTimer() = default; 26 Start()27 void Start() { 28 start_ = Now(); 29 } 30 GetInMs()31 int64 GetInMs() const { 32 using msec = std::chrono::milliseconds; 33 return std::chrono::duration_cast<msec>(GetDuration()).count(); 34 } 35 36 private: 37 using Clock = std::chrono::high_resolution_clock; 38 Now()39 static Clock::time_point Now() { 40 return Clock::now(); 41 } 42 GetDuration()43 Clock::duration GetDuration() const { 44 return Now() - start_; 45 } 46 47 Clock::time_point start_; 48 }; 49 50 #endif // S2_BASE_TIMER_H_ 51