signal.hpp

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#pragma once
 
#include "export.hpp"
#include "slot.hpp"
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <mutex>
#include <vector>
 
namespace aria::abi {

class ARIA_ABI_API SignalErased {
public:
    SignalErased();
    ~SignalErased();
 
    SignalErased(const SignalErased&) = delete;
    SignalErased& operator=(const SignalErased&) = delete;
    SignalErased(SignalErased&&) noexcept;
    SignalErased& operator=(SignalErased&&) noexcept;

    SlotId connect(SlotErased slot);

    void disconnect(SlotId id) noexcept;

    void emit(void* args) const;

    [[nodiscard]] std::size_t slot_count() const noexcept;

    void clear() noexcept;
 
    // ── Internal: weak control-block handle (used for safe disconnect) ──
    struct ControlBlock;
    [[nodiscard]] std::weak_ptr<ControlBlock> weak_handle() const noexcept;

    static void disconnect_via_weak(
        const std::weak_ptr<ControlBlock>& weak,
        SlotId id) noexcept;
 
private:
    std::shared_ptr<ControlBlock> cb_;
};
 
}  // namespace aria::abi