1 files changed, 68 insertions, 0 deletions
diff --git a/src/mmo/timer.t.hpp b/src/mmo/timer.t.hpp
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+++ b/src/mmo/timer.t.hpp
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+#ifndef TMWA_MMO_TIMER_T_HPP
+#define TMWA_MMO_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 // TMWA_MMO_TIMER_T_HPP