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wip new version

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This commit is contained in:
terik23 2019-04-30 10:31:34 +05:00
parent 39138d6ddf
commit 09373fbd6a
1 changed files with 40 additions and 26 deletions
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66
include/magic_enum.hpp
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@ -78,18 +78,20 @@ static_assert(MAGIC_ENUM_RANGE_MIN > std::numeric_limits<int>::min(),
namespace detail {
template <typename E, typename U = std::underlying_type_t<E>>
template <typename E>
[[nodiscard]] constexpr int min_impl() {
static_assert(std::is_enum_v<E>, "magic_enum::detail::min_impl requires enum type.");
using U = std::underlying_type_t<E>;
constexpr int min = enum_range<E>::min > (std::numeric_limits<U>::min)() ? enum_range<E>::min : (std::numeric_limits<U>::min)();
return min;
}
template <typename E, typename U = std::underlying_type_t<E>>
template <typename E>
[[nodiscard]] constexpr auto range_impl() {
static_assert(std::is_enum_v<E>, "magic_enum::detail::range_impl requires enum type.");
static_assert(enum_range<E>::max > enum_range<E>::min, "magic_enum::enum_range requires max > min.");
using U = std::underlying_type_t<E>;
constexpr int max = enum_range<E>::max < (std::numeric_limits<U>::max)() ? enum_range<E>::max : (std::numeric_limits<U>::max)();
constexpr auto range = std::make_integer_sequence<int, max - min_impl<E>() + 1>{};
@ -176,7 +178,7 @@ template <typename E, std::size_t... I>
}
template<typename T>
using enable_if_enum_t = typename std::enable_if<std::is_enum_v<std::decay_t<T>>>::type;
using enable_if_enum_t = std::enable_if_t<std::is_enum_v<std::decay_t<T>>>;
template<typename T, bool = std::is_enum_v<T>>
struct is_scoped_enum_impl : std::false_type {};
@ -209,12 +211,14 @@ template <typename T>
inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
// Obtains enum value from enum string name.
// Returns std::optional with enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::optional<E> enum_cast(std::string_view value) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_cast requires enum type.");
constexpr auto values = detail::values_impl<E>(detail::range_impl<E>());
[[nodiscard]] constexpr std::optional<std::decay_t<E>> enum_cast(std::string_view value) noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_cast requires enum type.");
constexpr auto values = detail::values_impl<D>(detail::range_impl<D>());
constexpr auto count = values.size();
constexpr auto names = detail::names_impl<E>(std::make_index_sequence<count>{});
constexpr auto names = detail::names_impl<D>(std::make_index_sequence<count>{});
for (std::size_t i = 0; i < count; ++i) {
if (names[i] == value) {
@ -226,14 +230,16 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
}
// Obtains enum value from integer value.
// Returns std::optional with enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::optional<E> enum_cast(std::underlying_type_t<E> value) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_cast requires enum type.");
[[nodiscard]] constexpr std::optional<std::decay_t<E>> enum_cast(std::underlying_type_t<std::decay_t<E>> value) noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_cast requires enum type.");
if (detail::name_impl<E>(static_cast<int>(value)).empty()) {
if (detail::name_impl<D>(static_cast<int>(value)).empty()) {
return std::nullopt; // Invalid value or out of range.
} else {
return static_cast<E>(value);
return static_cast<D>(value);
}
}
@ -249,32 +255,36 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
// Returns enum value at specified index.
// No bounds checking is performed: the behavior is undefined if index >= number of enum values.
template<typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr E enum_value(std::size_t index) {
static_assert(std::is_enum_v<E>, "magic_enum::enum_value requires enum type.");
constexpr auto values = detail::values_impl<E>(detail::range_impl<E>());
[[nodiscard]] constexpr auto enum_value(std::size_t index) {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_value requires enum type.");
constexpr auto values = detail::values_impl<D>(detail::range_impl<D>());
return assert(index < values.size()), values[index];
}
// Obtains value enum sequence.
// Returns std::array with enum values, sorted by enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_values() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_values requires enum type.");
constexpr auto values = detail::values_impl<E>(detail::range_impl<E>());
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_values requires enum type.");
constexpr auto values = detail::values_impl<D>(detail::range_impl<D>());
return values;
}
// Returns number of enum values.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::size_t enum_count() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_count requires enum type.");
constexpr auto count = detail::values_impl<E>(detail::range_impl<E>()).size();
[[nodiscard]] constexpr auto enum_count() noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_count requires enum type.");
constexpr auto count = detail::values_impl<D>(detail::range_impl<D>()).size();
return count;
}
// Obtains string enum name from enum value.
// Returns string enum name from enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::string_view enum_name(E value) noexcept {
using D = std::decay_t<E>;
@ -284,21 +294,25 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
}
// Obtains string enum name sequence.
// Returns std::array with string enum names, sorted by enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_names() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_names requires enum type.");
constexpr auto count = detail::values_impl<E>(detail::range_impl<E>()).size();
constexpr auto names = detail::names_impl<E>(std::make_index_sequence<count>{});
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_names requires enum type.");
constexpr auto count = detail::values_impl<D>(detail::range_impl<D>()).size();
constexpr auto names = detail::names_impl<D>(std::make_index_sequence<count>{});
return names;
}
// Obtains pair (value enum, string enum name) sequence.
// Returns std::array with std::pair (value enum, string enum name), sorted by enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_entries() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::enum_entries requires enum type.");
constexpr auto count = detail::values_impl<E>(detail::range_impl<E>()).size();
constexpr auto entries = detail::entries_impl<E>(std::make_index_sequence<count>{});
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_entries requires enum type.");
constexpr auto count = detail::values_impl<D>(detail::range_impl<D>()).size();
constexpr auto entries = detail::entries_impl<D>(std::make_index_sequence<count>{});
return entries;
}