Timer.h

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 #pragma once
 
 #include <memory>
 #include <functional>
 #include <atomic>
 
 namespace swt {
 class SLLooper;
 
 using TimerId = uint64_t;
 
 class Timer {
 private:
     TimerId mId;                                      
     std::weak_ptr<SLLooper> mLooper;                  
     std::atomic<bool> mCancelled{false};              
     mutable std::atomic<bool> mMoved{false};          
 public:
     Timer(TimerId id, std::weak_ptr<SLLooper> looper);
 
     Timer(const Timer&) = delete;
 
     Timer& operator=(const Timer&) = delete;
 
     Timer(Timer&& other) noexcept;
 
     Timer& operator=(Timer&& other) noexcept;
 
     ~Timer();
 
     // ========== Public API (boost-style) ==========
 
     void cancel();
 
     bool isActive() const;
 
     TimerId getId() const { return mId; }
 
     void restart(uint64_t delay_ms);
 
     friend class SLLooper;
 
 private:
     void moveFrom(Timer&& other) noexcept;
 };
 
 } // namespace swt