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fix enum_fuse

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neargye 2023-12-09 23:56:44 +04:00
parent 804738ba8a
commit 41f674b061
1 changed files with 12 additions and 21 deletions
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33
include/magic_enum/magic_enum_fuse.hpp
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@ -38,33 +38,30 @@ namespace magic_enum {
namespace detail { namespace detail {
template <typename E, typename... Es> template <typename E>
inline constexpr auto subtypes_v = subtype_v<E>;
template <enum_subtype S, typename E>
constexpr optional<std::uintmax_t> fuse_one_enum(optional<std::uintmax_t> hash, E value) noexcept { constexpr optional<std::uintmax_t> fuse_one_enum(optional<std::uintmax_t> hash, E value) noexcept {
if (hash) { if (hash) {
if (const auto index = enum_index(value)) { if (const auto index = enum_index(value)) {
return (*hash << log2(enum_count<E, S>() + 1)) | *index; return (*hash << log2(enum_count<E>() + 1)) | *index;
} }
} }
return {}; return {};
} }
template <enum_subtype S, typename E> template <typename E>
constexpr optional<std::uintmax_t> fuse_enum(E value) noexcept { constexpr optional<std::uintmax_t> fuse_enum(E value) noexcept {
return fuse_one_enum<S>(0, value); return fuse_one_enum(0, value);
} }
template <enum_subtype S, typename E, typename... Es> template <typename E, typename... Es>
constexpr optional<std::uintmax_t> fuse_enum(E head, Es... tail) noexcept { constexpr optional<std::uintmax_t> fuse_enum(E head, Es... tail) noexcept {
return fuse_one_enum<S>(fuse_enum<S>(tail...), head); return fuse_one_enum(fuse_enum(tail...), head);
} }
template <enum_subtype S, typename... Es> template <typename... Es>
constexpr auto typesafe_fuse_enum(Es... values) noexcept { constexpr auto typesafe_fuse_enum(Es... values) noexcept {
enum class enum_fuse_t : std::uintmax_t; enum class enum_fuse_t : std::uintmax_t;
const auto fuse = fuse_enum<S>(values...); const auto fuse = fuse_enum(values...);
if (fuse) { if (fuse) {
return optional<enum_fuse_t>{static_cast<enum_fuse_t>(*fuse)}; return optional<enum_fuse_t>{static_cast<enum_fuse_t>(*fuse)};
} }
@ -74,25 +71,19 @@ constexpr auto typesafe_fuse_enum(Es... values) noexcept {
} // namespace magic_enum::detail } // namespace magic_enum::detail
// Returns a bijective mix of several enum values. This can be used to emulate 2D switch/case statements. // Returns a bijective mix of several enum values. This can be used to emulate 2D switch/case statements.
template <detail::enum_subtype S, typename... Es> template <typename... Es>
[[nodiscard]] constexpr auto enum_fuse(Es... values) noexcept { [[nodiscard]] constexpr auto enum_fuse(Es... values) noexcept {
static_assert((std::is_enum_v<std::decay_t<Es>> && ...), "magic_enum::enum_fuse requires enum type."); static_assert((std::is_enum_v<std::decay_t<Es>> && ...), "magic_enum::enum_fuse requires enum type.");
static_assert(sizeof...(Es) >= 2, "magic_enum::enum_fuse requires at least 2 values."); static_assert(sizeof...(Es) >= 2, "magic_enum::enum_fuse requires at least 2 values.");
static_assert((detail::log2(enum_count<std::decay_t<Es>, S>() + 1) + ...) <= (sizeof(std::uintmax_t) * 8), "magic_enum::enum_fuse does not work for large enums"); static_assert((detail::log2(enum_count<std::decay_t<Es>>() + 1) + ...) <= (sizeof(std::uintmax_t) * 8), "magic_enum::enum_fuse does not work for large enums");
#if defined(MAGIC_ENUM_NO_TYPESAFE_ENUM_FUSE) #if defined(MAGIC_ENUM_NO_TYPESAFE_ENUM_FUSE)
const auto fuse = detail::fuse_enum<S, std::decay_t<Es>...>(values...); const auto fuse = detail::fuse_enum<std::decay_t<Es>...>(values...);
#else #else
const auto fuse = detail::typesafe_fuse_enum<S, std::decay_t<Es>...>(values...); const auto fuse = detail::typesafe_fuse_enum<std::decay_t<Es>...>(values...);
#endif #endif
return MAGIC_ENUM_ASSERT(fuse), fuse; return MAGIC_ENUM_ASSERT(fuse), fuse;
} }
// Returns a bijective mix of several enum values. This can be used to emulate 2D switch/case statements.
template <typename... Es>
[[nodiscard]] constexpr auto enum_fuse(Es... values) noexcept {
return enum_fuse<detail::subtypes_v<std::decay_t<Es>...>>(values...);
}
} // namespace magic_enum } // namespace magic_enum
#endif // NEARGYE_MAGIC_ENUM_FUSE_HPP #endif // NEARGYE_MAGIC_ENUM_FUSE_HPP