libcxxabi/test/support/timer.h

   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_USE_TIMER to enable testing with a timer.
  13 #if defined(LIBCXXABI_USE_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:
  24     timer() : m_start(Clock::now()) {}
  25
  26     timer(timer const &) = delete;
  27     timer & operator=(timer const &) = delete;
  28
  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_USE_TIMER */
  42
  43 class timer
  44 {
  45 public:
  46     timer() {}
  47     timer(timer const &) = delete;
  48     timer & operator=(timer const &) = delete;
  49     ~timer() {}
  50 };
  51
  52 #endif /* LIBCXXABI_USE_TIMER */
  53
  54 #endif /* TIMER_H */