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tdlib-fork/tdutils/td/utils/Observer.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
namespace td {
class ObserverBase {
public:
ObserverBase() = default;
ObserverBase(const ObserverBase &) = delete;
ObserverBase &operator=(const ObserverBase &) = delete;
ObserverBase(ObserverBase &&) = delete;
ObserverBase &operator=(ObserverBase &&) = delete;
virtual ~ObserverBase() = default;
virtual void notify() = 0;
};
class Observer : ObserverBase {
public:
Observer() = default;
explicit Observer(unique_ptr<ObserverBase> &&ptr) : observer_ptr_(std::move(ptr)) {
}
void notify() override {
if (observer_ptr_) {
observer_ptr_->notify();
}
}
private:
unique_ptr<ObserverBase> observer_ptr_;
};
} // namespace td