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#ifndef ENTT_CORE_ENUM_HPP
#define ENTT_CORE_ENUM_HPP
#include <type_traits>
namespace entt {
/**
* @brief Enable bitmask support for enum classes.
* @tparam Type The enum type for which to enable bitmask support.
*/
template<typename Type, typename = void>
struct enum_as_bitmask: std::false_type {};
/*! @copydoc enum_as_bitmask */
template<typename Type>
struct enum_as_bitmask<Type, std::void_t<decltype(Type::_entt_enum_as_bitmask)>>: std::is_enum<Type> {};
/**
* @brief Helper variable template.
* @tparam Type The enum class type for which to enable bitmask support.
*/
template<typename Type>
inline constexpr bool enum_as_bitmask_v = enum_as_bitmask<Type>::value;
} // namespace entt
/**
* @brief Operator available for enums for which bitmask support is enabled.
* @tparam Type Enum class type.
* @param lhs The first value to use.
* @param rhs The second value to use.
* @return The result of invoking the operator on the underlying types of the
* two values provided.
*/
template<typename Type>
[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
operator|(const Type lhs, const Type rhs) noexcept {
return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) | static_cast<std::underlying_type_t<Type>>(rhs));
}
/*! @copydoc operator| */
template<typename Type>
[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
operator&(const Type lhs, const Type rhs) noexcept {
return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) & static_cast<std::underlying_type_t<Type>>(rhs));
}
/*! @copydoc operator| */
template<typename Type>
[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
operator^(const Type lhs, const Type rhs) noexcept {
return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) ^ static_cast<std::underlying_type_t<Type>>(rhs));
}
/**
* @brief Operator available for enums for which bitmask support is enabled.
* @tparam Type Enum class type.
* @param value The value to use.
* @return The result of invoking the operator on the underlying types of the
* value provided.
*/
template<typename Type>
[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
operator~(const Type value) noexcept {
return static_cast<Type>(~static_cast<std::underlying_type_t<Type>>(value));
}
/*! @copydoc operator~ */
template<typename Type>
[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, bool>
operator!(const Type value) noexcept {
return !static_cast<std::underlying_type_t<Type>>(value);
}
/*! @copydoc operator| */
template<typename Type>
constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
operator|=(Type &lhs, const Type rhs) noexcept {
return (lhs = (lhs | rhs));
}
/*! @copydoc operator| */
template<typename Type>
constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
operator&=(Type &lhs, const Type rhs) noexcept {
return (lhs = (lhs & rhs));
}
/*! @copydoc operator| */
template<typename Type>
constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
operator^=(Type &lhs, const Type rhs) noexcept {
return (lhs = (lhs ^ rhs));
}
#endif
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