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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* This program 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 2 of the License, or (at your
* option) any later version.
*
* 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef EnumFlag_h__
#define EnumFlag_h__
#include <type_traits>
namespace EnumFlag
{
template<typename T>
struct IsFlag : std::false_type { };
}
template<typename T, std::enable_if_t<EnumFlag::IsFlag<T>::value, std::nullptr_t> = nullptr>
inline constexpr T operator&(T left, T right)
{
return static_cast<T>(static_cast<std::underlying_type_t<T>>(left) & static_cast<std::underlying_type_t<T>>(right));
}
template<typename T, std::enable_if_t<EnumFlag::IsFlag<T>::value, std::nullptr_t> = nullptr>
inline constexpr T& operator&=(T& left, T right)
{
return left = left & right;
}
template<typename T, std::enable_if_t<EnumFlag::IsFlag<T>::value, std::nullptr_t> = nullptr>
inline constexpr T operator|(T left, T right)
{
return static_cast<T>(static_cast<std::underlying_type_t<T>>(left) | static_cast<std::underlying_type_t<T>>(right));
}
template<typename T, std::enable_if_t<EnumFlag::IsFlag<T>::value, std::nullptr_t> = nullptr>
inline constexpr T& operator|=(T& left, T right)
{
return left = left | right;
}
template<typename T, std::enable_if_t<EnumFlag::IsFlag<T>::value, std::nullptr_t> = nullptr>
inline constexpr T operator~(T value)
{
return static_cast<T>(~static_cast<std::underlying_type_t<T>>(value));
}
template<typename T>
class EnumFlag_t
{
static_assert(EnumFlag::IsFlag<T>::value, "EnumFlag_t must be used only with enums that are specify EnumFlag::IsFlag");
public:
/*implicit*/ constexpr EnumFlag_t(T value) : _value(value)
{
}
constexpr EnumFlag_t& operator&=(EnumFlag_t right)
{
_value &= right._value;
return *this;
}
constexpr friend EnumFlag_t operator&(EnumFlag_t left, EnumFlag_t right)
{
return left &= right;
}
constexpr EnumFlag_t& operator|=(EnumFlag_t right)
{
_value |= right._value;
return *this;
}
constexpr friend EnumFlag_t operator|(EnumFlag_t left, EnumFlag_t right)
{
return left |= right;
}
constexpr EnumFlag_t operator~() const
{
return static_cast<T>(~static_cast<std::underlying_type_t<T>>(_value));
}
constexpr void RemoveFlag(EnumFlag_t flag)
{
_value &= ~flag._value;
}
constexpr bool HasFlag(T flag) const
{
using i = std::underlying_type_t<T>;
return static_cast<i>(_value & flag) != static_cast<i>(0);
}
constexpr bool HasAllFlags(T flags) const
{
return (_value & flags) == flags;
}
constexpr operator T() const
{
return _value;
}
constexpr std::underlying_type_t<T> AsUnderlyingType() const
{
return static_cast<std::underlying_type_t<T>>(_value);
}
private:
T _value;
};
#endif // EnumFlag_h__
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