GPSCancellation.h

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#pragma once
 
#include <functional>
#include <memory>
 
#include <QtCore/QtGlobal>
 
class GPSCancelToken
{
public:
    GPSCancelToken() = default;
 
    [[nodiscard]] bool isCancelled() const;
 
private:
    friend class GPSCancelSource;
    friend class GPSCancelCallback;
 
    struct State;
 
    explicit GPSCancelToken(std::shared_ptr<State> state);
 
    std::shared_ptr<State> _state;
};
 
class GPSCancelSource
{
public:
    GPSCancelSource();
 
    [[nodiscard]] GPSCancelToken token() const;
 
    bool cancel();
 
    [[nodiscard]] bool isCancelled() const;
 
private:
    std::shared_ptr<GPSCancelToken::State> _state;
};
 
class GPSCancelCallback
{
public:
    GPSCancelCallback(const GPSCancelToken& token, std::function<void()> callback);
    ~GPSCancelCallback();
 
    Q_DISABLE_COPY(GPSCancelCallback)
 
private:
    std::shared_ptr<GPSCancelToken::State> _state;
    std::function<void()> _callback;
};