1 /*
2  * Copyright 2022 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 #pragma once
18 
19 #include <bluetooth/log.h>
20 
21 #include <chrono>
22 #include <cstdint>
23 #include <string>
24 
25 class Stopwatch {
26  public:
Stopwatch(std::string name)27   Stopwatch(std::string name)
28       : name_(std::move(name)),
29         start_(std::chrono::duration_cast<std::chrono::milliseconds>(
30                    std::chrono::system_clock::now().time_since_epoch())
31                    .count()) {}
32 
LapMs()33   uint64_t LapMs() const {
34     uint64_t now = std::chrono::duration_cast<std::chrono::milliseconds>(
35                        std::chrono::system_clock::now().time_since_epoch())
36                        .count();
37     return now - start_;
38   }
39 
ToString()40   std::string ToString() { return ToString(""); }
41 
ToString(const std::string & comment)42   std::string ToString(const std::string& comment) {
43     return fmt::format("{}: {} ms {}", name_,
44                        static_cast<unsigned long>(LapMs()), comment);
45   }
46 
47  private:
48   std::string name_;
49   uint64_t start_;
50 };
51