42 lines
984 B
C++
42 lines
984 B
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2023
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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namespace td {
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class ObserverBase {
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public:
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ObserverBase() = default;
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ObserverBase(const ObserverBase &) = delete;
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ObserverBase &operator=(const ObserverBase &) = delete;
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ObserverBase(ObserverBase &&) = delete;
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ObserverBase &operator=(ObserverBase &&) = delete;
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virtual ~ObserverBase() = default;
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virtual void notify() = 0;
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};
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class Observer final : private ObserverBase {
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public:
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Observer() = default;
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explicit Observer(unique_ptr<ObserverBase> &&ptr) : observer_ptr_(std::move(ptr)) {
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}
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void notify() final {
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if (observer_ptr_) {
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observer_ptr_->notify();
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}
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}
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private:
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unique_ptr<ObserverBase> observer_ptr_;
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};
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} // namespace td
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