96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It 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 General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include <rpl/event_stream.h>
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namespace Data {
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template <typename FlagsType>
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using FlagsUnderlying = typename FlagsType::Type;
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template <
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typename FlagsType,
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FlagsUnderlying<FlagsType> kEssential = FlagsUnderlying<FlagsType>(-1)>
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class Flags {
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public:
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using Type = FlagsType;
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using Enum = typename Type::Enum;
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struct Change {
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using Type = FlagsType;
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using Enum = typename Type::Enum;
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Change(Type diff, Type value)
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: diff(diff)
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, value(value) {
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}
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Type diff = 0;
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Type value = 0;
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};
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Flags() = default;
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Flags(Type value) : _value(value) {
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}
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void set(Type which) {
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if (auto diff = which ^ _value) {
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_value = which;
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updated(diff);
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}
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}
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void add(Type which) {
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if (auto diff = which & ~_value) {
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_value |= which;
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updated(diff);
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}
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}
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void remove(Type which) {
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if (auto diff = which & _value) {
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_value &= ~which;
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updated(diff);
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}
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}
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auto current() const {
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return _value;
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}
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auto changes() const {
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return _changes.events();
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}
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auto value() const {
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return _changes.events_starting_with({
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Type::from_raw(kEssential),
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_value });
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}
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private:
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void updated(Type diff) {
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if ((diff &= Type::from_raw(kEssential))) {
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_changes.fire({ diff, _value });
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}
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}
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Type _value = 0;
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rpl::event_stream<Change> _changes;
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};
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} // namespace Data
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