control_box.hpp

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#pragma once
 
#include <atomic>
#include <compare>
#include <cstdint>
#include <functional>
#include <toast/export.hpp>
 
namespace toast {
class Node;
 
namespace _detail {
struct WorldTestAccess;

struct TOAST_API ControlBox {
  std::atomic<unsigned int> ref_count;    
  Node* node = nullptr;                   

  ControlBox(Node* n);
 
  ControlBox(const ControlBox&) = delete;
  ControlBox(ControlBox&&) = delete;
  auto operator=(const ControlBox&) -> ControlBox& = delete;
  auto operator=(ControlBox&&) -> ControlBox& = delete;

  explicit operator bool() const noexcept;

  auto operator<=>(const ControlBox& other) const noexcept -> std::strong_ordering;
  auto operator==(const ControlBox& other) const noexcept -> bool;

  [[nodiscard]]
  auto rid() const noexcept -> std::uintptr_t;
  void increment();
  void decrement();

  static auto get(const Node* node) -> ControlBox*;
  static auto get(const Node& node) -> ControlBox*;
};
 
}
}
 
template<>
struct std::hash<toast::_detail::ControlBox> {
  auto operator()(const toast::_detail::ControlBox& a) const noexcept -> std::size_t {
    return std::hash<std::uintptr_t> {}(a.rid());
  }
};