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#pragma once
#include "base.hpp"
#include <functional>
#include <map>
#include <memory>
#include <utility>
namespace cru {
using EventHandlerRevoker = std::function<void()>;
// A non-copyable non-movable Event class.
// It stores a list of event handlers.
template <typename... TArgs>
class Event {
private:
using EventResolver = std::function<Event*()>;
class EventHandlerRevokerImpl {
public:
EventHandlerRevokerImpl(const std::shared_ptr<EventResolver>& resolver,
long token)
: resolver_(resolver), token_(token) {}
EventHandlerRevokerImpl(const EventHandlerRevokerImpl& other) = default;
EventHandlerRevokerImpl(EventHandlerRevokerImpl&& other) = default;
EventHandlerRevokerImpl& operator=(EventHandlerRevokerImpl&& other) =
default;
EventHandlerRevokerImpl& operator=(EventHandlerRevokerImpl&& other) =
default;
~EventHandlerRevokerImpl() = default;
void operator()() {
const auto true_resolver = resolver_.lock();
if (true_resolver) {
true_resolver()->RemoveHandler(token_);
}
}
private:
std::weak_ptr<EventResolver> resolver_;
long token_;
};
public:
using EventHandler = std::function<void(TArgs...)>;
Event()
: event_resolver_(new std::function<Event*()>([this] { return this; })) {}
Event(const Event&) = delete;
Event& operator=(const Event&) = delete;
Event(Event&&) = delete;
Event& operator=(Event&&) = delete;
~Event() = default;
EventHandlerRevoker AddHandler(const EventHandler& handler) {
const auto token = current_token_++;
handlers_.emplace(token, handler);
return EventHandlerRevoker(EventHandlerRevokerImpl(event_resolver_, token));
}
template <typename... Args>
EventHandlerRevoker AddHandler(Args&& args...) {
const auto token = current_token_++;
handlers_.emplace(token, EventHandler(std::forward<Args>(args)...));
return EventHandlerRevoker(EventHandlerRevokerImpl(event_resolver_, token));
}
template <typename... Args>
void Raise(Args&&... args) {
for (const auto& handler : handlers_)
(handler.second)(std::forward<Args>(args)...);
}
private:
void RemoveHandler(const long token) {
auto find_result = handlers_.find(token);
if (find_result != handlers_.cend()) handlers_.erase(find_result);
}
private:
std::map<long, EventHandler> handlers_{};
long current_token_ = 0;
std::shared_ptr<EventResolver> event_resolver_;
};
} // namespace cru
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