time.hpp

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/*
 * Copyright 2019 Nico Reißmann <nico.reissmann@gmail.com>
 * Copyright 2024 Håvard Krogstie <krogstie.havard@gmail.com>
 * See COPYING for terms of redistribution.
 */
 
#ifndef JLM_UTIL_TIME_HPP
#define JLM_UTIL_TIME_HPP
 
#include <jlm/util/common.hpp>
 
#include <chrono>
 
namespace jlm::util
{
 
class Timer final
{
public:
  constexpr Timer()
      : ElapsedTimeInNanoseconds_(0),
        IsRunning_(false)
  {}
 
  Timer(const Timer & other) = delete;
  Timer(Timer && other) = default;
  Timer &
  operator=(const Timer & other) = delete;
  Timer &
  operator=(Timer && other) = default;
 
  [[nodiscard]] bool
  isRunning() const noexcept
  {
    return IsRunning_;
  }
 
  void
  reset() noexcept
  {
    ElapsedTimeInNanoseconds_ = 0;
    IsRunning_ = false;
  }
 
  void
  start() noexcept
  {
    if (IsRunning_)
      return;
    Start_ = std::chrono::high_resolution_clock::now();
    IsRunning_ = true;
  }
 
  void
  stop() noexcept
  {
    if (!IsRunning_)
      return;
    auto end = std::chrono::high_resolution_clock::now();
    ElapsedTimeInNanoseconds_ +=
        std::chrono::duration_cast<std::chrono::nanoseconds>(end - Start_).count();
    IsRunning_ = false;
  }
 
  [[nodiscard]] size_t
  ns() const
  {
    if (IsRunning_)
      throw std::logic_error("Timer is running");
    return ElapsedTimeInNanoseconds_;
  }
 
private:
  size_t ElapsedTimeInNanoseconds_;
  bool IsRunning_;
  std::chrono::time_point<std::chrono::high_resolution_clock> Start_;
};
 
}
 
#endif