Part.h

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#pragma once
 
#include <atomic>
#include <memory>
#include <stdint.h>
#ifdef COMPONENT_THREAD_SAFE
#include <mutex>
#endif
 
namespace Ship {
 
class Context;
 
#define INVALID_PART_ID UINT64_MAX
 
class Part {
  public:
    Part();
    explicit Part(std::shared_ptr<Context> context);
    virtual ~Part() = default;
 
    uint64_t GetId() const;
 
    bool operator==(const Part& other) const;
 
    std::shared_ptr<Context> GetContext() const;
 
    void SetContext(std::shared_ptr<Context> ctx);
 
  protected:
    virtual void OnAdded(bool forced);
 
    virtual void OnRemoved(bool forced);
 
    template <typename, typename> friend class PartList;
 
  private:
    static std::atomic<uint64_t> sNextPartId;
    uint64_t mId;
    std::weak_ptr<Context> mContext;
#ifdef COMPONENT_THREAD_SAFE
    // Guards mContext, which can be written by SetContext (during context
    // propagation on Add) while other threads read it via GetContext().
    mutable std::mutex mContextMutex;
#endif
};
 
} // namespace Ship