1 //===----------------------------------------------------------------------===////
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===////
8 
9 #ifndef TIMER_H
10 #define TIMER_H
11 
12 // Define LIBCXXABI_NO_TIMER to disable testing with a timer.
13 #ifndef LIBCXXABI_NO_TIMER
14 
15 #include <chrono>
16 #include <cstdio>
17 
18 class timer
19 {
20     typedef std::chrono::high_resolution_clock Clock;
21     typedef Clock::time_point TimePoint;
22     typedef std::chrono::microseconds MicroSeconds;
23 public:
timer()24     timer() : m_start(Clock::now()) {}
25 
26     timer(timer const &) = delete;
27     timer & operator=(timer const &) = delete;
28 
~timer()29     ~timer()
30     {
31         using std::chrono::duration_cast;
32         TimePoint end = Clock::now();
33         MicroSeconds us = duration_cast<MicroSeconds>(end - m_start);
34         std::printf("%d microseconds\n", us.count());
35     }
36 
37 private:
38     TimePoint m_start;
39 };
40 
41 #else /* LIBCXXABI_NO_TIMER */
42 
43 class timer
44 {
45 public:
timer()46     timer() {}
47     timer(timer const &) = delete;
48     timer & operator=(timer const &) = delete;
~timer()49     ~timer() {}
50 };
51 
52 #endif /* LIBCXXABI_NO_TIMER */
53 
54 #endif /* TIMER_H */
55