mirror/magic_enum
1
0
Fork 0
mirror of https://github.com/Neargye/magic_enum.git synced 2026-01-10 23:44:29 +00:00
Code Activity

add is_unscoped_enum/is_scoped_enum

Browse source
This commit is contained in:
neargye 2019-04-08 18:29:03 +05:00
parent 11a0366421
commit d24d38ea50
3 changed files with 70 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

32
include/magic_enum.hpp
View file

@ -180,11 +180,39 @@ template <typename E>
return std::nullopt; // Invalid value or out of range.
}
template<class E>
using enable_if_enum_t = typename std::enable_if<std::is_enum_v<std::decay_t<E>>>::type;
template<typename T>
using enable_if_enum_t = typename std::enable_if<std::is_enum_v<std::decay_t<T>>>::type;
template<typename T, bool = std::is_enum_v<T>>
struct is_scoped_enum_impl : std::false_type {};
template<typename T>
struct is_scoped_enum_impl<T, true> : std::bool_constant<!std::is_convertible_v<T, std::underlying_type_t<T>>> {};
template<typename T, bool = std::is_enum_v<T>>
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>>> {};
} // namespace magic_enum::detail
// Checks whether T is an Unscoped enumeration type. Provides the member constant value which is equal to true, if T is an Unscoped enumeration type. Otherwise, value is equal to false.
// https://en.cppreference.com/w/cpp/language/enum#Unscoped_enumeration
template <typename T>
struct is_unscoped_enum : detail::is_unscoped_enum_impl<T> {};
template <typename T>
inline constexpr bool is_unscoped_enum_v = is_unscoped_enum<T>::value;
// Checks whether T is an Scoped enumeration type. Provides the member constant value which is equal to true, if T is an Scoped enumeration type. Otherwise, value is equal to false.
// https://en.cppreference.com/w/cpp/language/enum#Scoped_enumerations
template <typename T>
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;
// Obtains enum value from enum string name.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::optional<E> enum_cast(std::string_view value) noexcept {