| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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 ANDROID_BASE_CHRONO_UTILS_H |
| #define ANDROID_BASE_CHRONO_UTILS_H |
| |
| #include <chrono> |
| #include <sstream> |
| |
| using namespace std::chrono_literals; |
| |
| namespace android { |
| namespace base { |
| |
| // A std::chrono clock based on CLOCK_BOOTTIME. |
| class boot_clock { |
| public: |
| typedef std::chrono::nanoseconds duration; |
| typedef std::chrono::time_point<boot_clock, duration> time_point; |
| |
| static time_point now(); |
| }; |
| |
| class Timer { |
| public: |
| Timer() : start_(boot_clock::now()) {} |
| |
| std::chrono::milliseconds duration() const { |
| return std::chrono::duration_cast<std::chrono::milliseconds>(boot_clock::now() - start_); |
| } |
| |
| private: |
| boot_clock::time_point start_; |
| }; |
| |
| std::ostream& operator<<(std::ostream& os, const Timer& t); |
| |
| } // namespace base |
| } // namespace android |
| |
| #endif // ANDROID_BASE_CHRONO_UTILS_H |