Parameters

template <typename Event, typename... Args>
class Observable
{
...
    template <typename... Args>
    void Notify(const Event &event, Args... Params) const
    {
        if (m_observers.size() > 0)
        {
            for (const auto &observer : m_observers.at(event))
            {
                observer(Params...);
            }
        }
    }