in_place_stop_token.h

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#pragma once
 
#include "di/sync/stop_token/in_place_stop_source.h"
 
namespace di::sync {
class InPlaceStopToken {
private:
    friend class InPlaceStopSource;
 
    template<typename>
    friend class InPlaceStopCallback;
 
    explicit InPlaceStopToken(InPlaceStopSource const* source) : m_source(source) {}
 
public:
    template<typename Callback>
    using CallbackType = InPlaceStopCallback<Callback>;
 
    InPlaceStopToken() = default;
    ~InPlaceStopToken() = default;
 
    [[nodiscard]] auto stop_requested() const -> bool { return !!m_source && m_source->stop_requested(); }
    [[nodiscard]] auto stop_possible() const -> bool { return !!m_source; }
 
    [[nodiscard]] auto operator==(InPlaceStopToken const&) const -> bool = default;
 
private:
    InPlaceStopSource const* m_source { nullptr };
};
 
inline auto InPlaceStopSource::get_stop_token() const -> InPlaceStopToken {
    return InPlaceStopToken { this };
}
}