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less bin size, improving check supported compiler, clean-up

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thanks @rollbear
This commit is contained in:
neargye 2019-08-26 22:05:49 +05:00
parent 2e61a86b2f
commit e30e8d81bd
1 changed files with 105 additions and 54 deletions
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159
include/magic_enum.hpp
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@ -82,14 +82,50 @@ static_assert(MAGIC_ENUM_RANGE_MAX > MAGIC_ENUM_RANGE_MIN,
namespace detail {
template <typename T>
struct magic_enum_supported final
#if defined(__clang__) || defined(__GNUC__) && __GNUC__>= 9 || defined(_MSC_VER)
: std::true_type {};
#else
: std::false_type {};
#endif
template <std::size_t N>
struct static_string final {
constexpr static_string(std::string_view str) noexcept : static_string(str, std::make_index_sequence<N>{}) {}
constexpr const char* data() const noexcept { return chars.data(); }
constexpr std::size_t size() const noexcept { return chars.size(); }
constexpr operator std::string_view() const noexcept { return {chars.data(), chars.size()}; }
private:
template <std::size_t... I>
constexpr static_string(std::string_view str, std::index_sequence<I...>) noexcept : chars{{str[I]...}} {}
const std::array<char, N> chars;
};
template <>
struct static_string<0> final {
constexpr static_string(std::string_view) noexcept {}
constexpr const char* data() const noexcept { return nullptr; }
constexpr std::size_t size() const noexcept { return 0; }
constexpr operator std::string_view() const noexcept { return {}; }
};
template <typename E>
inline constexpr auto min_v = enum_range<E>::min > (std::numeric_limits<std::underlying_type_t<E>>::min)()
? enum_range<E>::min
: (std::numeric_limits<std::underlying_type_t<E>>::min)();
template <typename E>
[[nodiscard]] constexpr auto range_impl() {
static_assert(std::is_enum_v<E>, "magic_enum::detail::range_impl requires enum type.");
[[nodiscard]] constexpr auto range() {
static_assert(std::is_enum_v<E>, "magic_enum::detail::range requires enum type.");
static_assert(enum_range<E>::min > (std::numeric_limits<int>::min)(), "magic_enum::enum_range requires min must be greater than INT_MIN.");
static_assert(enum_range<E>::max < (std::numeric_limits<int>::max)(), "magic_enum::enum_range requires max must be less than INT_MAX.");
static_assert(enum_range<E>::max > enum_range<E>::min, "magic_enum::enum_range requires max > min.");
@ -100,10 +136,10 @@ template <typename E>
}
template <typename E>
inline constexpr auto range_v = range_impl<E>();
inline constexpr auto range_v = range<E>();
[[nodiscard]] constexpr std::string_view pretty_name(std::string_view name) noexcept {
for (std::size_t i = name.length(); i > 0; --i) {
for (std::size_t i = name.size(); i > 0; --i) {
if (!((name[i - 1] >= '0' && name[i - 1] <= '9') ||
(name[i - 1] >= 'a' && name[i - 1] <= 'z') ||
(name[i - 1] >= 'A' && name[i - 1] <= 'Z') ||
@ -113,57 +149,57 @@ inline constexpr auto range_v = range_impl<E>();
}
}
if (name.length() > 0 && ((name.front() >= 'a' && name.front() <= 'z') ||
(name.front() >= 'A' && name.front() <= 'Z') ||
(name.front() == '_'))) {
if (name.size() > 0 && ((name.front() >= 'a' && name.front() <= 'z') ||
(name.front() >= 'A' && name.front() <= 'Z') ||
(name.front() == '_'))) {
return name;
}
return {}; // Invalid name.
}
template <typename T>
struct always_false final : std::false_type {};
template <typename E, E V>
[[nodiscard]] constexpr auto name_impl() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::name_impl requires enum type.");
[[nodiscard]] constexpr auto n() noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::name requires enum type.");
#if defined(__clang__) || defined(__GNUC__) && __GNUC__ >= 9
return pretty_name({__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 2});
constexpr auto name = pretty_name({__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 2});
#elif defined(_MSC_VER)
return pretty_name({__FUNCSIG__, sizeof(__FUNCSIG__) - 17});
constexpr auto name = pretty_name({__FUNCSIG__, sizeof(__FUNCSIG__) - 17});
#else
static_assert(always_false<E>{}, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
return std::string_view{}; // Unsupported compiler.
#endif
#if defined(__clang__) || defined(__GNUC__) && __GNUC__ >= 9 || defined(_MSC_VER)
return static_string<name.size()>{name};
#endif
}
template <typename E, int... I>
[[nodiscard]] constexpr auto strings_impl(std::integer_sequence<int, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::strings_impl requires enum type.");
template <typename E, E V>
inline constexpr auto name_v = n<E, V>();
return std::array<std::string_view, sizeof...(I)>{{name_impl<E, static_cast<E>(I + min_v<E>)>()...}};
template <typename E, int... I>
[[nodiscard]] constexpr auto strings(std::integer_sequence<int, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::strings requires enum type.");
return std::array<std::string_view, sizeof...(I)>{{name_v<E, static_cast<E>(I + min_v<E>)>...}};
}
template <typename E>
inline constexpr auto strings_v = strings_impl<E>(range_v<E>);
[[nodiscard]] constexpr std::string_view name(E value) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::name requires enum type.");
constexpr auto names = strings<E>(range_v<E>);
template <typename E>
[[nodiscard]] constexpr std::string_view name_impl(E value) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::name_impl requires enum type.");
constexpr auto strings = strings_v<E>;
if (auto i = static_cast<std::size_t>(static_cast<int>(value) - min_v<E>); i < strings.size()) {
return strings[i];
if (auto i = static_cast<std::size_t>(static_cast<int>(value) - min_v<E>); i < names.size()) {
return names[i];
}
return {}; // Value out of range.
}
template <typename E, int... I>
[[nodiscard]] constexpr auto values_impl(std::integer_sequence<int, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::values_impl requires enum type.");
constexpr std::array<bool, sizeof...(I)> valid{{!name_impl<E, static_cast<E>(I + min_v<E>)>().empty()...}};
[[nodiscard]] constexpr auto values(std::integer_sequence<int, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::values requires enum type.");
constexpr std::array<bool, sizeof...(I)> valid{{(name_v<E, static_cast<E>(I + min_v<E>)>.size() != 0 )...}};
constexpr auto num_valid = ((valid[I] ? 1 : 0) + ...);
std::array<E, num_valid> values{};
@ -177,30 +213,30 @@ template <typename E, int... I>
}
template <typename E>
inline constexpr auto values_v = values_impl<E>(range_v<E>);
inline constexpr auto values_v = values<E>(range_v<E>);
template <typename E>
inline constexpr auto count_v = values_v<E>.size();
template <typename E, std::size_t... I>
[[nodiscard]] constexpr auto names_impl(std::integer_sequence<std::size_t, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::names_impl requires enum type.");
[[nodiscard]] constexpr auto names(std::integer_sequence<std::size_t, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::names requires enum type.");
return std::array<std::string_view, sizeof...(I)>{{name_impl<E, values_v<E>[I]>()...}};
return std::array<std::string_view, sizeof...(I)>{{name_v<E, values_v<E>[I]>...}};
}
template <typename E>
inline constexpr auto names_v = names_impl<E>(std::make_index_sequence<count_v<E>>{});
inline constexpr auto names_v = names<E>(std::make_index_sequence<count_v<E>>{});
template <typename E, std::size_t... I>
[[nodiscard]] constexpr auto entries_impl(std::integer_sequence<std::size_t, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::entries_impl requires enum type.");
[[nodiscard]] constexpr auto entries(std::integer_sequence<std::size_t, I...>) noexcept {
static_assert(std::is_enum_v<E>, "magic_enum::detail::entries requires enum type.");
return std::array<std::pair<E, std::string_view>, sizeof...(I)>{{{values_v<E>[I], names_v<E>[I]}...}};
}
template <typename E>
inline constexpr auto entries_v = entries_impl<E>(std::make_index_sequence<count_v<E>>{});
inline constexpr auto entries_v = entries<E>(std::make_index_sequence<count_v<E>>{});
template <typename T>
using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
@ -212,35 +248,38 @@ template <typename E, typename D>
inline constexpr bool check_enum_v = std::is_same_v<remove_cvref_t<E>, D> && std::is_enum_v<D>;
template <typename T, bool = std::is_enum_v<T>>
struct is_scoped_enum_impl : std::false_type {};
struct is_scoped_enum : 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>>> {};
struct is_scoped_enum<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 {};
struct is_unscoped_enum : 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>>> {};
struct is_unscoped_enum<T, true> : std::bool_constant<std::is_convertible_v<T, std::underlying_type_t<T>>> {};
template <typename T, typename = T>
struct is_fixed_enum_impl : std::false_type {};
struct is_fixed_enum : std::false_type {};
template <typename T>
struct is_fixed_enum_impl<T, decltype(T{0})> : std::is_enum<T> {};
struct is_fixed_enum<T, decltype(T{0})> : std::is_enum<T> {};
template <typename T, bool = std::is_enum_v<T>>
struct underlying_type_impl {};
struct underlying_type {};
template <typename T>
struct underlying_type_impl<T, true> : std::underlying_type<T> {};
struct underlying_type<T, true> : std::underlying_type<T> {};
} // namespace magic_enum::detail
// Checks is magic_enum supported compiler.
inline constexpr auto is_magic_enum_supported = detail::magic_enum_supported<void>::value;
// Checks whether T is an Unscoped enumeration type.
// Provides the member constant value which is equal to true, if T is an [Unscoped enumeration](https://en.cppreference.com/w/cpp/language/enum#Unscoped_enumeration) type. Otherwise, value is equal to false.
template <typename T>
struct is_unscoped_enum : detail::is_unscoped_enum_impl<T> {};
struct is_unscoped_enum : detail::is_unscoped_enum<T> {};
template <typename T>
inline constexpr bool is_unscoped_enum_v = is_unscoped_enum<T>::value;
@ -248,7 +287,7 @@ 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](https://en.cppreference.com/w/cpp/language/enum#Scoped_enumerations) type. Otherwise, value is equal to false.
template <typename T>
struct is_scoped_enum : detail::is_scoped_enum_impl<T> {};
struct is_scoped_enum : detail::is_scoped_enum<T> {};
template <typename T>
inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
@ -256,7 +295,7 @@ inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
// Checks whether T is an Fixed enumeration type.
// Provides the member constant value which is equal to true, if T is an [Fixed enumeration](https://en.cppreference.com/w/cpp/language/enum) type. Otherwise, value is equal to false.
template <typename T>
struct is_fixed_enum : detail::is_fixed_enum_impl<T> {};
struct is_fixed_enum : detail::is_fixed_enum<T> {};
template <typename T>
inline constexpr bool is_fixed_enum_v = is_fixed_enum<T>::value;
@ -264,7 +303,7 @@ inline constexpr bool is_fixed_enum_v = is_fixed_enum<T>::value;
// If T is a complete enumeration type, provides a member typedef type that names the underlying type of T.
// Otherwise, if T is not an enumeration type, there is no member type. Otherwise (T is an incomplete enumeration type), the program is ill-formed.
template <typename T>
struct underlying_type : detail::underlying_type_impl<T> {};
struct underlying_type : detail::underlying_type<T> {};
template <typename T>
using underlying_type_t = typename underlying_type<T>::type;
@ -273,6 +312,7 @@ using underlying_type_t = typename underlying_type<T>::type;
// Returns std::optional with enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::optional<D> enum_cast(std::string_view value) noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_cast requires enum type.");
constexpr auto values = detail::values_v<D>;
constexpr auto count = detail::count_v<D>;
@ -291,9 +331,10 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
// Returns std::optional with enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::optional<D> enum_cast(std::underlying_type_t<D> value) noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_cast requires enum type.");
if (detail::name_impl<D>(static_cast<D>(value)).empty()) {
if (detail::name<D>(static_cast<D>(value)).empty()) {
return std::nullopt; // Invalid value or out of range.
}
@ -303,6 +344,7 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
// Returns integer value from enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::underlying_type_t<D> enum_integer(E value) noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_integer requires enum type.");
return static_cast<std::underlying_type_t<D>>(value);
@ -312,6 +354,7 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
// No bounds checking is performed: the behavior is undefined if index >= number of enum values.
template<typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr D enum_value(std::size_t index) {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_value requires enum type.");
constexpr auto values = detail::values_v<D>;
@ -322,6 +365,7 @@ template<typename E, typename D = detail::enable_if_enum_t<E>>
// Returns std::array with enum values, sorted by enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_values() noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_values requires enum type.");
constexpr auto values = detail::values_v<D>;
@ -331,6 +375,7 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
// Returns number of enum values.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::size_t enum_count() noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_count requires enum type.");
constexpr auto count = detail::count_v<D>;
@ -341,23 +386,26 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
// This version is much lighter on the compile times and is not restricted to the enum_range limitation.
template <auto V, typename D = detail::enable_if_enum_t<decltype(V)>>
[[nodiscard]] constexpr std::string_view enum_name() noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<decltype(V), D>, "magic_enum::enum_name requires enum type.");
return detail::name_impl<D, V>();
return detail::name_v<D, V>;
}
// Returns string enum name from enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::string_view enum_name(E value) noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_name requires enum type.");
return detail::name_impl<D>(value);
return detail::name<D>(value);
}
// Obtains string enum name sequence.
// Returns std::array with string enum names, sorted by enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_names() noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_names requires enum type.");
constexpr auto names = detail::names_v<D>;
@ -368,6 +416,7 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
// Returns std::array with std::pair (value enum, string enum name), sorted by enum value.
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_entries() noexcept {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_entries requires enum type.");
constexpr auto entries = detail::entries_v<D>;
@ -378,9 +427,10 @@ namespace ostream_operators {
template <class Char, class Traits, typename E, typename D = detail::enable_if_enum_t<E>>
std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, E value) {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::ostream_operators::operator<< requires enum type.");
if (auto name = detail::name_impl<D>(value); !name.empty()) {
if (auto name = detail::name<D>(value); !name.empty()) {
for (auto c : name) {
os.put(c);
}
@ -393,6 +443,7 @@ std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& o
template <class Char, class Traits, typename E, typename D = detail::enable_if_enum_t<E>>
std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, std::optional<E> value) {
static_assert(detail::magic_enum_supported<D>::value, "magic_enum: Unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
static_assert(detail::check_enum_v<E, D>, "magic_enum::ostream_operators::operator<< requires enum type.");
if (value.has_value()) {