Timer.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

#pragma once

#include <boost/signals2.hpp>

#include <chrono>

using namespace std::chrono_literals;

using clock_type = std::chrono::high_resolution_clock;

class Timer
{
public:
  Timer(std::chrono::milliseconds interval, bool cyclic) : m_start_time(clock_type::now()), m_interval(interval), m_running(false), m_cyclic(cyclic)
  {}

  // connect to this signal
  boost::signals2::signal<void()> elapsed;

  void start()
  {
    m_running = true;
    m_start_time = clock_type::now();
  }

  void stop()
  {
    m_running = false;
  }

  bool is_elapsed()
  {
    return m_start_time + m_interval < clock_type::now();
  }

  void update()
  {
    if (m_running && is_elapsed()) {
      elapsed();
      if (m_cyclic) {
        start();
      } else {
        stop();
      }
    }
  }

private:
  std::chrono::time_point<clock_type> m_start_time;
  std::chrono::milliseconds m_interval;
  bool m_running;
  bool m_cyclic;
};