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#ifndef TIMER_T_HPP
#define TIMER_T_HPP
# include <chrono>
# include <functional>
# include "dumb_ptr.hpp"
struct TimerData;
/// An implementation of the C++ "clock" concept, exposing
/// durations in milliseconds.
class milli_clock
{
public:
typedef std::chrono::milliseconds duration;
typedef duration::rep rep;
typedef duration::period period;
typedef std::chrono::time_point<milli_clock, duration> time_point;
static const bool is_steady = true; // assumed - not necessarily true
static time_point now() noexcept;
};
/// A point in time.
typedef milli_clock::time_point tick_t;
/// The difference between two points in time.
typedef milli_clock::duration interval_t;
/// (to get additional arguments, use std::bind or a lambda).
typedef std::function<void (TimerData *, tick_t)> timer_func;
class Timer
{
friend struct TimerData;
dumb_ptr<TimerData> td;
Timer(const Timer&) = delete;
Timer& operator = (const Timer&) = delete;
public:
/// Don't own anything yet.
Timer() = default;
/// Schedule a timer for the given tick.
/// If you do not wish to keep track of it, call disconnect().
/// Otherwise, you may cancel() or replace (operator =) it later.
///
/// If the interval argument is given, the timer will reschedule
/// itself again forever. Otherwise, it will disconnect() itself
/// just BEFORE it is called.
Timer(tick_t tick, timer_func func, interval_t interval=interval_t::zero());
Timer(Timer&& t);
Timer& operator = (Timer&& t);
~Timer() { cancel(); }
/// Cancel the delivery of this timer's function, and make it falsy.
/// Implementation note: this doesn't actually remove it, just sets
/// the functor to do_nothing, and waits for the tick before removing.
void cancel();
/// Make it falsy without cancelling the timer,
void detach();
/// Check if there is a timer connected.
explicit operator bool() { return bool(td); }
/// Check if there is no connected timer.
bool operator !() { return !td; }
};
#endif // TIMER_T_HPP
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