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Telegram/SourceFiles/data/data_flags.h
83 строки
2 KB
John Preston
Use single LEGAL file with license and copyright.
03 янв 2018, 13:23
03 янв 2018, 13:23
ea7441a
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/* This file is part of Telegram Desktop, the official desktop application for the Telegram messaging service. For license and copyright information please follow this link: https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL */ #pragma once #include <rpl/event_stream.h> namespace Data { template <typename FlagsType> using FlagsUnderlying = typename FlagsType::Type; template < typename FlagsType, FlagsUnderlying<FlagsType> kEssential = FlagsUnderlying<FlagsType>(-1)> class Flags { public: using Type = FlagsType; using Enum = typename Type::Enum; struct Change { using Type = FlagsType; using Enum = typename Type::Enum; Change(Type diff, Type value) : diff(diff) , value(value) { } Type diff = 0; Type value = 0; }; Flags() = default; Flags(Type value) : _value(value) { } void set(Type which) { if (auto diff = which ^ _value) { _value = which; updated(diff); } } void add(Type which) { if (auto diff = which & ~_value) { _value |= which; updated(diff); } } void remove(Type which) { if (auto diff = which & _value) { _value &= ~which; updated(diff); } } auto current() const { return _value; } auto changes() const { return _changes.events(); } auto value() const { return _changes.events_starting_with({ Type::from_raw(kEssential), _value }); } private: void updated(Type diff) { if ((diff &= Type::from_raw(kEssential))) { _changes.fire({ diff, _value }); } } Type _value = 0; rpl::event_stream<Change> _changes; }; } // namespace Data