reflect_event.hpp

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#pragma once
#include <asio/serial_port_base.hpp>
#include <toast/events/event.hpp>
#include <toast/export.hpp>
#include <toast/reflect/reflect.hpp>
 
namespace toast {
 
struct TOAST_API EventInfo {
  std::string_view name;
  std::type_index type;
 
  [[nodiscard]]
  constexpr auto id() const -> uint32_t {
    uint32_t hash = 2166136261u;
    for (char c : name) {
      hash ^= static_cast<uint8_t>(c);
      hash *= 16777619u;
    }
    return hash;
  }
};
 
class TOAST_API EventRegistry {
  static inline EventRegistry* instance = nullptr;
  std::unordered_map<std::string_view, const EventInfo*> types;
 
public:
  static void registerEvent(const EventInfo* info) { (*instance).types[info->name] = info; }
 
  [[nodiscard]]
  static auto reflect(std::string_view name) -> const EventInfo* {
    auto it = (*instance).types.find(name);
    return it != (*instance).types.end() ? it->second : nullptr;
  }
};
}

 
template<>
struct toast::Reflect<event::_detail::IEvent> {
  static constexpr std::string_view name = "event::_detail::IEvent";
  inline static const toast::EventInfo type_info = {
    .name = name,
    .type = typeid(event::_detail::IEvent),
  };
};
 
void registerEventTypes() {
  static const std::array<const toast::EventInfo*, 8> all_types = {
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
    &toast::Reflect<event::_detail::IEvent>::type_info,
  };
  for (const auto* info : all_types) {
    toast::EventRegistry::registerEvent(info);
  }
}