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Add adl_ranges (#413)

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Co-authored-by: lsemprini <17140216+lsemprini@users.noreply.github.com>
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ZXShady 2025-06-11 20:00:01 +03:00 • committed by GitHub
parent 513e606d7b
commit d642b05dcb
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5 changed files with 174 additions and 14 deletions
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48
include/magic_enum/magic_enum.hpp
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@ -163,15 +163,57 @@ static_assert([] {
return true;
} (), "magic_enum::customize wchar_t is not compatible with ASCII.");
namespace detail {
template<typename E, typename = void>
constexpr inline bool has_is_flags_adl = false;
template<typename E>
constexpr inline bool has_is_flags_adl < E, std::void_t<decltype(decltype(adl_magic_enum_define_range(E{}))::is_flags) > > = decltype(adl_magic_enum_define_range(E{}))::is_flags;
template<typename E, typename = void>
constexpr inline auto has_minmax_adl = std::pair<int, int>(MAGIC_ENUM_RANGE_MIN, MAGIC_ENUM_RANGE_MAX);
template<typename E>
constexpr inline auto has_minmax_adl < E, std::void_t<decltype(decltype(adl_magic_enum_define_range(E{}))::max), decltype(decltype(adl_magic_enum_define_range(E{}))::max) >> =
std::pair<int, int>(decltype(adl_magic_enum_define_range(E{}))::min, decltype(adl_magic_enum_define_range(E{}))::max);
}
namespace customize {
template<auto... Vs>
struct adl_info { static_assert(sizeof...(Vs) && !sizeof...(Vs), "adl_info parameter types must be either 2 ints exactly or 1 bool for the is_flgas"); };
template<int Min, int Max>
struct adl_info<Min, Max> {
static constexpr int min = Min;
static constexpr int max = Max;
};
template<bool IsFlags>
struct adl_info<IsFlags> {
static constexpr bool is_flags = IsFlags;
};
// Enum value must be in range [MAGIC_ENUM_RANGE_MIN, MAGIC_ENUM_RANGE_MAX]. By default MAGIC_ENUM_RANGE_MIN = -128, MAGIC_ENUM_RANGE_MAX = 127.
// If need another range for all enum types by default, redefine the macro MAGIC_ENUM_RANGE_MIN and MAGIC_ENUM_RANGE_MAX.
// If need another range for specific enum type, add specialization enum_range for necessary enum type.
template <typename E>
template <typename E, typename = void>
struct enum_range {
static constexpr int min = MAGIC_ENUM_RANGE_MIN;
static constexpr int max = MAGIC_ENUM_RANGE_MAX;
static constexpr int min = MAGIC_ENUM_RANGE_MIN;
static constexpr int max = MAGIC_ENUM_RANGE_MAX;
};
template <typename E>
struct enum_range < E, decltype(void(adl_magic_enum_define_range(E{}))) > {
static constexpr int min = detail::has_minmax_adl<E>.first;
static constexpr int max = detail::has_minmax_adl<E>.second;
static constexpr bool is_flags = detail::has_is_flags_adl<E>;
static_assert(is_flags || min != MAGIC_ENUM_RANGE_MIN || max != MAGIC_ENUM_RANGE_MAX,
"adl_magic_enum_define_range is declared for this enum but does not define any constants.\n"
"be sure that the member names are static and are not mispelled.");
};
static_assert(MAGIC_ENUM_RANGE_MAX > MAGIC_ENUM_RANGE_MIN, "MAGIC_ENUM_RANGE_MAX must be greater than MAGIC_ENUM_RANGE_MIN.");