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refactoring

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This commit is contained in:
neargye 2019-07-23 19:54:41 +05:00
parent ef5ab60f37
commit 6a977cbe9a
1 changed files with 42 additions and 48 deletions
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90
include/magic_enum.hpp
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@ -119,9 +119,9 @@ template <typename E>
(name.front() >= 'A' && name.front() <= 'Z') ||
(name.front() == '_'))) {
return name;
} else {
return {}; // Invalid name.
}
return {}; // Invalid name.
}
template <typename E, E V>
@ -153,11 +153,11 @@ template <typename E>
static_assert(std::is_enum_v<E>, "magic_enum::detail::name_impl requires enum type.");
constexpr auto names = strings_impl<E>(range_impl<E>());
if (auto i = static_cast<std::size_t>(value - min_impl<E>()); i < names.size()) {
if (auto i = static_cast<std::size_t>((value - min_impl<E>())); i < names.size()) {
return names[i];
} else {
return {}; // Value out of range.
}
return {}; // Value out of range.
}
template <typename E, int... I>
@ -195,7 +195,13 @@ template <typename E, std::size_t... I>
}
template <typename T>
using enable_if_enum_t = std::enable_if_t<std::is_enum_v<std::decay_t<T>>>;
using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
template <typename T>
using enable_if_enum_t = std::enable_if_t<std::is_enum_v<remove_cvref_t<T>>, remove_cvref_t<T>>;
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 {};
@ -257,10 +263,9 @@ using underlying_type_t = typename underlying_type<T>::type;
// 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<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.");
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::check_enum_v<E, 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<D>(std::make_index_sequence<count>{});
@ -276,33 +281,30 @@ 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<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.");
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::check_enum_v<E, D>, "magic_enum::enum_cast requires enum type.");
if (detail::name_impl<D>(static_cast<int>(value)).empty()) {
return std::nullopt; // Invalid value or out of range.
} else {
return static_cast<D>(value);
}
return static_cast<D>(value);
}
// Returns integer value from enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_integer(E value) noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_integer requires enum type.");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_integer requires enum type.");
return static_cast<std::underlying_type_t<D>>(value);
}
// 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>>
template<typename E, typename D = detail::enable_if_enum_t<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.");
static_assert(detail::check_enum_v<E, 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];
@ -310,50 +312,45 @@ template<typename E, typename = detail::enable_if_enum_t<E>>
// Obtains value enum sequence.
// Returns std::array with enum values, sorted by enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_values() noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_values requires enum type.");
static_assert(detail::check_enum_v<E, 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 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();
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::size_t enum_count() noexcept {
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_count requires enum type.");
constexpr std::size_t count = detail::values_impl<D>(detail::range_impl<D>()).size();
return count;
}
// Returns string enum name from static storage enum variable.
// This version is much lighter on the compile times and is not restricted to the enum_range limitation.
template <auto V, typename = detail::enable_if_enum_t<decltype(V)>>
template <auto V, typename D = detail::enable_if_enum_t<decltype(V)>>
[[nodiscard]] constexpr std::string_view enum_name() noexcept {
using D = std::decay_t<decltype(V)>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_name requires enum type.");
static_assert(detail::check_enum_v<decltype(V), D>, "magic_enum::enum_name requires enum type.");
return detail::name_impl<D, V>();
}
// Returns string enum name from enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::string_view enum_name(E value) noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_name requires enum type.");
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_name requires enum type.");
return detail::name_impl<D>(static_cast<int>(value));
}
// 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>>
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_names() noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_names requires enum type.");
static_assert(detail::check_enum_v<E, 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>{});
@ -362,10 +359,9 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
// 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>>
template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr auto enum_entries() noexcept {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_entries requires enum type.");
static_assert(detail::check_enum_v<E, 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>{});
@ -374,10 +370,9 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
namespace ops {
template <class Char, class Traits, typename E, typename = detail::enable_if_enum_t<E>>
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) {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::ops::operator<< requires enum type.");
static_assert(detail::check_enum_v<E, D>, "magic_enum::ops::operator<< requires enum type.");
if (auto name = detail::name_impl<D>(static_cast<int>(value)); !name.empty()) {
for (auto c : name) {
@ -388,10 +383,9 @@ std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& o
return os;
}
template <class Char, class Traits, typename E, typename = detail::enable_if_enum_t<E>>
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) {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::ops::operator<< requires enum type.");
static_assert(detail::check_enum_v<E, D>, "magic_enum::ops::operator<< requires enum type.");
if (value.has_value()) {
if (auto name = detail::name_impl<D>(static_cast<int>(value.value())); !name.empty()) {