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54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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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 : 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() override {
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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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