slot.hpp

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#pragma once
 
#include "export.hpp"
#include <cstddef>
#include <cstdint>
#include <utility>
 
namespace aria::abi {

struct SlotId {
    std::uint64_t value = 0;
    [[nodiscard]] constexpr bool valid() const noexcept { return value != 0; }
    constexpr bool operator==(SlotId rhs) const noexcept { return value == rhs.value; }
    constexpr bool operator!=(SlotId rhs) const noexcept { return value != rhs.value; }
};

class ARIA_ABI_API SlotErased {
public:
    using Invoker = void (*)(void* state, void* args) noexcept;
    using Destroyer = void (*)(void* state) noexcept;
 
    SlotErased() noexcept = default;
 
    SlotErased(Invoker inv, Destroyer dtor, void* state) noexcept
        : invoker_(inv), destroyer_(dtor), state_(state) {}
 
    ~SlotErased() noexcept;
 
    SlotErased(SlotErased&& o) noexcept;
    SlotErased& operator=(SlotErased&& o) noexcept;
 
    SlotErased(const SlotErased&) = delete;
    SlotErased& operator=(const SlotErased&) = delete;
 
    void invoke(void* args) const noexcept {
        if (ARIA_LIKELY(invoker_)) invoker_(state_, args);
    }
 
    [[nodiscard]] bool empty() const noexcept { return invoker_ == nullptr; }
 
private:
    Invoker invoker_ = nullptr;
    Destroyer destroyer_ = nullptr;
    void* state_ = nullptr;
};
 
}  // namespace aria::abi