listener_token.hpp

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#pragma once
 
#include <cstdint>
#include <memory>
 
namespace pulp::state {
 
namespace detail {
struct ListenerRegistry; // defined in src/store.cpp
}

enum class ListenerThread {
    Main,
    Audio,
};

enum class ListenerRestoreBehavior {
    Silent,
    Reconcile,
};

class ListenerToken {
public:
    ListenerToken() = default;
    ListenerToken(std::weak_ptr<detail::ListenerRegistry> registry, std::uint64_t id) noexcept;
 
    ListenerToken(const ListenerToken&) = delete;
    ListenerToken& operator=(const ListenerToken&) = delete;
 
    ListenerToken(ListenerToken&& other) noexcept;
    ListenerToken& operator=(ListenerToken&& other) noexcept;
 
    ~ListenerToken();

    void reset() noexcept;

    explicit operator bool() const noexcept { return id_ != 0; }

    std::uint64_t id() const noexcept { return id_; }
 
private:
    std::weak_ptr<detail::ListenerRegistry> registry_;
    std::uint64_t id_ = 0;
};
 
} // namespace pulp::state