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#pragma once
#include <functional>
using Callback = std::function<void()>;
template <typename Event>
class IObservable
{
public:
virtual ~IObservable() noexcept = default;
virtual void listen() const noexcept = 0;
virtual void attach(const Event &event, Callback callback) noexcept = 0;
virtual void notify(const Event &event) const noexcept = 0;
};
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