core/utils/Clock.h

#ifndef CORE_CLOCK_H
#define CORE_CLOCK_H

#include "data/Array.h"
#include "utils/Check.h"

namespace Core {
    struct Clock final {
        using Nanos = i64;

    private:
        static constexpr int BITS = 7;
        static constexpr int LENGTH = 1 << BITS;
        int index;
        Nanos last;
        Nanos sum;
        Array<Nanos, LENGTH> time;

    public:
        Clock();

        // returns true on error and calls the error callback
        // the first invocation will always return 0 nanos
        check_return bool update(Nanos& n);
        float getUpdatesPerSecond() const;
        // returns true on error and calls the error callback
        check_return bool wait(Nanos nanos) const;

        // returns true on error and calls the error callback
        check_return static bool getNanos(Nanos& n);
    };
}

#endif