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fix clang llvm-project#50055(reviews.llvm.org/D130058)

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neargye 2022-08-08 20:40:35 +04:00
parent f5d6f707a9
commit 95641a8f78
1 changed files with 29 additions and 11 deletions
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40
include/magic_enum.hpp
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@ -431,26 +431,44 @@ constexpr auto n() noexcept {
template <typename E, E V>
inline constexpr auto enum_name_v = n<E, V>();
#if defined(__clang__) || defined(__GNUC__)
template <typename E, auto V, typename = void>
struct is_valid : std::false_type {};
template <typename E, auto V>
constexpr bool is_valid() noexcept {
struct is_valid<E, V, std::void_t<decltype(n<E, static_cast<E>(V)>())>> : std::bool_constant<(n<E, static_cast<E>(V)>().size() != 0)> {};
#else
template <typename E, auto V>
constexpr bool valid() noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::is_valid requires enum type.");
return n<E, static_cast<E>(V)>().size() != 0;
}
template <typename E, auto V>
struct is_valid : std::bool_constant<valid<E, static_cast<E>(V)>()> {};
#endif
template <typename E, int O, bool IsFlags, typename U = std::underlying_type_t<E>>
constexpr U ualue(std::size_t i) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::value requires enum type.");
if constexpr (std::is_same_v<U, bool>) { // bool special case
static_assert(O == 0, "magic_enum::detail::value requires valid offset.");
return static_cast<U>(i);
} else if constexpr (IsFlags) {
return static_cast<U>(U{1} << static_cast<U>(static_cast<int>(i) + O));
} else {
return static_cast<U>(static_cast<int>(i) + O);
}
}
template <typename E, int O, bool IsFlags, typename U = std::underlying_type_t<E>>
constexpr E value(std::size_t i) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::value requires enum type.");
if constexpr (std::is_same_v<U, bool>) { // bool special case
static_assert(O == 0, "magic_enum::detail::value requires valid offset.");
return static_cast<E>(i);
} else if constexpr (IsFlags) {
return static_cast<E>(U{1} << static_cast<U>(static_cast<int>(i) + O));
} else {
return static_cast<E>(static_cast<int>(i) + O);
}
return static_cast<E>(ualue<E, O, IsFlags>(i));
}
template <typename E, bool IsFlags, typename U = std::underlying_type_t<E>>
@ -510,7 +528,7 @@ constexpr std::size_t values_count(const bool (&valid)[N]) noexcept {
template <typename E, bool IsFlags, int Min, std::size_t... I>
constexpr auto values(std::index_sequence<I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::values requires enum type.");
constexpr bool valid[sizeof...(I)] = {is_valid<E, value<E, Min, IsFlags>(I)>()...};
constexpr bool valid[sizeof...(I)] = {is_valid<E, ualue<E, Min, IsFlags>(I)>::value...};
constexpr std::size_t count = values_count(valid);
if constexpr (count > 0) {