tdesktop/Telegram/SourceFiles/base/enum_mask.h

61 lines
1.5 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
namespace base {
template <typename Enum>
class enum_mask {
using Type = std::uint32_t;
public:
static_assert(static_cast<int>(Enum::kCount) <= 32, "We have only 32 bit.");
enum_mask() = default;
enum_mask(Enum value) : _value(ToBit(value)) {
}
enum_mask added(enum_mask other) const {
auto result = *this;
result.set(other);
return result;
}
void set(enum_mask other) {
_value |= other._value;
}
bool test(Enum value) const {
return _value & ToBit(value);
}
explicit operator bool() const {
return _value != 0;
}
private:
inline static Type ToBit(Enum value) {
return 1 << static_cast<Type>(value);
}
Type _value = 0;
};
} // namespace base