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https://github.com/mod-playerbots/azerothcore-wotlk.git
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132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
/*
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* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Affero General Public License as published by the
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* Free Software Foundation; either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EnumFlag_h__
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#define EnumFlag_h__
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#include <type_traits>
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template<typename T>
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constexpr bool IsEnumFlag(T) { return false; }
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#define DEFINE_ENUM_FLAG(enumType) constexpr bool IsEnumFlag(enumType) { return true; }
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namespace EnumTraits
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{
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template<typename T>
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using IsFlag = std::integral_constant<bool, IsEnumFlag(T{})>;
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}
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template<typename T, std::enable_if_t<EnumTraits::IsFlag<T>::value, std::nullptr_t> = nullptr>
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inline constexpr T operator&(T left, T right)
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{
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return static_cast<T>(static_cast<std::underlying_type_t<T>>(left) & static_cast<std::underlying_type_t<T>>(right));
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}
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template<typename T, std::enable_if_t<EnumTraits::IsFlag<T>::value, std::nullptr_t> = nullptr>
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inline constexpr T& operator&=(T& left, T right)
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{
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return left = left & right;
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}
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template<typename T, std::enable_if_t<EnumTraits::IsFlag<T>::value, std::nullptr_t> = nullptr>
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inline constexpr T operator|(T left, T right)
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{
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return static_cast<T>(static_cast<std::underlying_type_t<T>>(left) | static_cast<std::underlying_type_t<T>>(right));
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}
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template<typename T, std::enable_if_t<EnumTraits::IsFlag<T>::value, std::nullptr_t> = nullptr>
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inline constexpr T& operator|=(T& left, T right)
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{
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return left = left | right;
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}
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template<typename T, std::enable_if_t<EnumTraits::IsFlag<T>::value, std::nullptr_t> = nullptr>
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inline constexpr T operator~(T value)
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{
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return static_cast<T>(~static_cast<std::underlying_type_t<T>>(value));
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}
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template<typename T>
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class EnumFlag
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{
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static_assert(EnumTraits::IsFlag<T>::value, "EnumFlag must be used only with enums that are specify EnumFlag::IsFlag");
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public:
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/*implicit*/ constexpr EnumFlag(T value) : _value(value)
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{
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}
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constexpr EnumFlag& operator&=(EnumFlag right)
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{
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_value &= right._value;
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return *this;
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}
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constexpr friend EnumFlag operator&(EnumFlag left, EnumFlag right)
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{
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return left &= right;
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}
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constexpr EnumFlag& operator|=(EnumFlag right)
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{
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_value |= right._value;
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return *this;
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}
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constexpr friend EnumFlag operator|(EnumFlag left, EnumFlag right)
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{
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return left |= right;
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}
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constexpr EnumFlag operator~() const
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{
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return static_cast<T>(~static_cast<std::underlying_type_t<T>>(_value));
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}
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constexpr void RemoveFlag(EnumFlag flag)
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{
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_value &= ~flag._value;
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}
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constexpr bool HasFlag(T flag) const
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{
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using i = std::underlying_type_t<T>;
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return static_cast<i>(_value & flag) != static_cast<i>(0);
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}
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constexpr bool HasAllFlags(T flags) const
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{
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return (_value & flags) == flags;
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}
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constexpr operator T() const
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{
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return _value;
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}
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constexpr std::underlying_type_t<T> AsUnderlyingType() const
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{
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return static_cast<std::underlying_type_t<T>>(_value);
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}
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private:
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T _value;
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};
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#endif // EnumFlag_h__
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