/usr/include/mircommon/mir/flags.h is in libmircommon-dev 0.26.3+16.04.20170605-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright © 2015 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored By: Andreas Pokorny <andreas.pokorny@canonical.com>
*/
#ifndef MIR_FLAGS_H_
#define MIR_FLAGS_H_
#include <type_traits>
namespace mir
{
/*!
* Treat an enumeration, scoped and unscoped, like a set of flags.
*
* For scoped enumerations, there are optional bitwise operators available
* that can be enabled by declaring a function within the namespace of the
* enumeration (here Enum):
* \code
* Enum mir_enable_enum_bit_operators(Enum);
* \endcode
*/
template<typename Enum>
struct Flags
{
using value_type = typename std::underlying_type<Enum>::type;
explicit constexpr Flags(value_type flag_value = 0) noexcept
: flag_value{flag_value} {}
constexpr Flags(Enum flag_value) noexcept
: flag_value{static_cast<value_type>(flag_value)} {}
constexpr Flags<Enum> operator|(Flags<Enum> other) const noexcept
{
return Flags<Enum>(flag_value|other.flag_value);
}
constexpr Flags<Enum> operator&(Flags<Enum> other) const noexcept
{
return Flags<Enum>(flag_value & other.flag_value);
}
constexpr Flags<Enum> operator^(Flags<Enum> other) const noexcept
{
return Flags<Enum>(flag_value ^ other.flag_value);
}
// those mutating operators could be trated as constexpr with c++14
Flags<Enum>& operator|=(Flags<Enum> other) noexcept
{
flag_value |= other.flag_value;
return *this;
}
Flags<Enum> operator&=(Flags<Enum> other) noexcept
{
flag_value &= other.flag_value;
return *this;
}
Flags<Enum> operator^=(Flags<Enum> other) noexcept
{
flag_value ^= other.flag_value;
return *this;
}
constexpr bool operator==(Flags<Enum> other) const noexcept
{
return flag_value == other.flag_value;
}
constexpr bool operator!=(Flags<Enum> other) const noexcept
{
return flag_value != other.flag_value;
}
constexpr value_type value() const noexcept
{
return flag_value;
}
private:
value_type flag_value;
};
template<typename Enum>
constexpr Flags<Enum> operator|(Flags<Enum> flags, Enum e) noexcept
{
return Flags<Enum>(flags.value() | static_cast<decltype(flags.value())>(e));
}
template<typename Enum>
constexpr Flags<Enum> operator|(Enum e, Flags<Enum> flags) noexcept
{
return Flags<Enum>(flags.value() | static_cast<decltype(flags.value())>(e));
}
template<typename Enum>
constexpr Enum operator&(Enum e, Flags<Enum> flags) noexcept
{
return static_cast<Enum>(flags.value() & static_cast<decltype(flags.value())>(e));
}
template<typename Enum>
constexpr Enum operator&(Flags<Enum> flags, Enum e) noexcept
{
return static_cast<Enum>(flags.value() & static_cast<decltype(flags.value())>(e));
}
template<typename Enum>
constexpr bool operator==(Flags<Enum> flags, Enum e) noexcept
{
return e == static_cast<Enum>(flags.value());
}
template<typename Enum>
constexpr bool operator==(Enum e, Flags<Enum> flags) noexcept
{
return e == static_cast<Enum>(flags.value());
}
template<typename Enum>
constexpr bool contains(Flags<Enum> flags, Enum e) noexcept
{
return e == static_cast<Enum>(flags.value() & static_cast<decltype(flags.value())>(e));
}
}
template<typename Enum>
constexpr mir::Flags<decltype(mir_enable_enum_bit_operators(static_cast<Enum>(0)))>
operator|(Enum lhs, Enum rhs) noexcept
{
return mir::Flags<Enum>(lhs) | mir::Flags<Enum>(rhs);
}
template<typename Enum>
constexpr mir::Flags<decltype(mir_enable_enum_bit_operators(static_cast<Enum>(0)))>
operator&(Enum lhs, Enum rhs) noexcept
{
return mir::Flags<Enum>(lhs) & mir::Flags<Enum>(rhs);
}
template<typename Enum>
constexpr mir::Flags<decltype(mir_enable_enum_bit_operators(static_cast<Enum>(0)))>
operator^(Enum lhs, Enum rhs) noexcept
{
return mir::Flags<Enum>(lhs) ^ mir::Flags<Enum>(rhs);
}
#endif
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