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#pragma once
#include <functional>
#include <vector>
namespace discord {
template <typename... Args>
class Event final {
public:
using Token = int;
Event() { slots_.reserve(4); }
Event(Event const&) = default;
Event(Event&&) = default;
~Event() = default;
Event& operator=(Event const&) = default;
Event& operator=(Event&&) = default;
template <typename EventHandler>
Token Connect(EventHandler slot)
{
slots_.emplace_back(Slot{nextToken_, std::move(slot)});
return nextToken_++;
}
void Disconnect(Token token)
{
for (auto& slot : slots_) {
if (slot.token == token) {
slot = slots_.back();
slots_.pop_back();
break;
}
}
}
void DisconnectAll() { slots_ = {}; }
void operator()(Args... args)
{
for (auto const& slot : slots_) {
slot.fn(std::forward<Args>(args)...);
}
}
private:
struct Slot {
Token token;
std::function<void(Args...)> fn;
};
Token nextToken_{};
std::vector<Slot> slots_{};
};
} // namespace discord
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