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// SPDX-License-Identifier: LGPL-3.0-or-later
// Author: Kristian Lytje
#pragma once
#include <functional>
namespace ausaxs::utility {
namespace detail {
template<typename T> concept observable_type = requires(T t, const T& value) {
{ t.attach_observer(value) } -> std::same_as<void>;
{ t.detach_observer(value) } -> std::same_as<void>;
{ t.notify(value) } -> std::same_as<void>;
};
}
template<typename T>
struct Observer {
Observer() = default;
~Observer() {
on_delete();
}
std::function<void(const T&)> on_notify;
std::function<void()> on_delete;
void notify(const T& value) {
on_notify(value);
}
};
}
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