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