/usr/include/mircommon/mir/flags.h is in libmircommon-dev 0.21.0+16.04.20160330-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | /*
* 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):
* \begincode
* 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 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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