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add enum traits

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neargye 2019-07-11 20:23:21 +05:00
parent 251d948438
commit 6fb880356c
1 changed files with 28 additions and 0 deletions
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28
include/magic_enum.hpp
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@ -205,6 +205,18 @@ struct is_unscoped_enum_impl : std::false_type {};
template <typename T>
struct is_unscoped_enum_impl<T, true> : std::bool_constant<std::is_convertible_v<T, std::underlying_type_t<T>>> {};
template <typename T, typename = T>
struct is_fixed_enum_impl : std::false_type {};
template <typename T>
struct is_fixed_enum_impl<T, decltype(T{0})> : std::is_enum<T> {};
template <typename T, bool = std::is_enum_v<T>>
struct underlying_type_impl {};
template <typename T>
struct underlying_type_impl<T, true> : std::underlying_type<T> {};
} // namespace magic_enum::detail
// Checks whether T is an Unscoped enumeration type.
@ -223,6 +235,22 @@ struct is_scoped_enum : detail::is_scoped_enum_impl<T> {};
template <typename T>
inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
// Checks whether T is an Fixed enumeration type.
// Provides the member constant value which is equal to true, if T is an [Fixed enumeration](https://en.cppreference.com/w/cpp/language/enum) type. Otherwise, value is equal to false.
template <typename T>
struct is_fixed_enum : detail::is_fixed_enum_impl<T> {};
template <typename T>
inline constexpr bool is_fixed_enum_v = is_fixed_enum<T>::value;
// If T is a complete enumeration type, provides a member typedef type that names the underlying type of T.
// Otherwise, if T is not an enumeration type, there is no member type. Otherwise (T is an incomplete enumeration type), the program is ill-formed.
template <typename T>
struct underlying_type : detail::underlying_type_impl<T> {};
template <typename T>
using underlying_type_t = typename underlying_type<T>::type;
// Obtains enum value from enum string name.
// Returns std::optional with enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>