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get values on all reflected_range to avoid additional work

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neargye 2019-10-14 13:10:15 +05:00
parent 6b95773b05
commit 4066fa35e5
1 changed files with 42 additions and 83 deletions
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125
include/magic_enum.hpp
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@ -142,31 +142,33 @@ constexpr std::string_view pretty_name(std::string_view name) noexcept {
}
template<typename L, typename R>
constexpr bool mixed_sign_less(L left, R right) noexcept {
static_assert(std::is_integral_v<L>, "L must be an integral value");
static_assert(std::is_integral_v<R>, "R must be an integral value");
constexpr bool mixed_sign_less(L lhs, R rhs) noexcept {
static_assert(std::is_integral_v<L> && std::is_integral_v<R>, "magic_enum::detail::mixed_sign_less requires integral type.");
if constexpr(std::is_signed_v<L> == std::is_signed_v<R>) {
// If same signedness (both signed or both unsigned)
return left < right;
}
else if constexpr(std::is_signed_v<L>) {
// if 'left' is negative, then result is 'true', otherwise cast & compare
return left < 0 || static_cast<std::make_unsigned_t<L>>(left) < right;
}
else { // std::is_signed_v<R>
// if 'right' is negative, then result is 'false', otherwise cast & compare
return right >= 0 && left < static_cast<std::make_unsigned_t<R>>(right);
// If same signedness (both signed or both unsigned).
return lhs < rhs;
} else if constexpr(std::is_signed_v<L>) {
// If 'left' is negative, then result is 'true', otherwise cast & compare.
return lhs < 0 || static_cast<std::make_unsigned_t<L>>(lhs) < rhs;
} else { // std::is_signed_v<R>
// If 'right' is negative, then result is 'false', otherwise cast & compare.
return rhs >= 0 && lhs < static_cast<std::make_unsigned_t<R>>(rhs);
}
}
template<typename L, typename R>
constexpr int mixed_sign_min_as_int(L left, R right) noexcept {
return mixed_sign_less(left, right) ? static_cast<int>(left) : static_cast<int>(right);
constexpr int mixed_sign_min_as_int(L lhs, R rhs) noexcept {
static_assert(std::is_integral_v<L> && std::is_integral_v<R>, "magic_enum::detail::mixed_sign_min_as_int requires integral type.");
return mixed_sign_less(lhs, rhs) ? static_cast<int>(lhs) : static_cast<int>(rhs);
}
template<typename L, typename R>
constexpr int mixed_sign_max_as_int(L left, R right) noexcept {
return mixed_sign_less(left, right) ? static_cast<int>(right) : static_cast<int>(left);
constexpr int mixed_sign_max_as_int(L lhs, R rhs) noexcept {
static_assert(std::is_integral_v<L> && std::is_integral_v<R>, "magic_enum::detail::mixed_sign_max_as_int requires integral type.");
return mixed_sign_less(lhs, rhs) ? static_cast<int>(rhs) : static_cast<int>(lhs);
}
template <typename E>
@ -210,10 +212,10 @@ template <typename E, E V>
inline constexpr auto name_v = n<E, V>();
template <typename E>
inline constexpr int reflected_min_v = mixed_sign_max_as_int(enum_range<E>::min, std::numeric_limits<std::underlying_type_t<E>>::min());
inline constexpr int reflected_min_v = mixed_sign_max_as_int(enum_range<E>::min, (std::numeric_limits<std::underlying_type_t<E>>::min)());
template <typename E>
inline constexpr int reflected_max_v = mixed_sign_min_as_int(enum_range<E>::max, std::numeric_limits<std::underlying_type_t<E>>::max());
inline constexpr int reflected_max_v = mixed_sign_min_as_int(enum_range<E>::max, (std::numeric_limits<std::underlying_type_t<E>>::max)());
template <typename E>
constexpr std::size_t reflected_size() {
@ -228,49 +230,33 @@ constexpr std::size_t reflected_size() {
return static_cast<std::size_t>(size);
}
template <typename E>
inline constexpr std::size_t reflected_size_v = reflected_size<E>();
template <typename E, int... I>
constexpr std::array<bool, reflected_size_v<E>> reflected_set_v_helper(std::integer_sequence<int, I...>) {
return {{(n<E, static_cast<E>(I + reflected_min_v<E>)>().size() != 0)...}};
constexpr auto values(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::values requires enum type.");
constexpr std::array<bool, sizeof...(I)> valid{{(n<E, static_cast<E>(I + reflected_min_v<E>)>().size() != 0)...}};
constexpr std::size_t count = ((valid[I] ? 1 : 0) + ...);
std::array<E, count> values{};
for (std::size_t i = 0, v = 0; v < count; ++i) {
if (valid[i]) {
values[v++] = static_cast<E>(static_cast<int>(i) + reflected_min_v<E>);
}
}
return values;
}
template<typename E>
inline constexpr std::array<bool, reflected_size_v<E>> reflected_set_v = reflected_set_v_helper<E>(std::make_integer_sequence<int, reflected_size_v<E>>{});
inline constexpr auto values_v = values<E>(std::make_integer_sequence<int, reflected_size<E>()>{});
template <typename E>
constexpr int range_min() noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::range_min requires enum type.");
// Find leftmost value.
for (int i = 0; i < static_cast<int>(reflected_size_v<E>); ++i) {
if (reflected_set_v<E>[i]) {
return i + reflected_min_v<E>;
}
}
return reflected_max_v<E>;
}
inline constexpr std::size_t count_v = values_v<E>.size();
template <typename E>
constexpr int range_max() noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::range_max requires enum type.");
// Find rightmost value
for (int i = static_cast<int>(reflected_size_v<E>) - 1; i >= 0; --i) {
if (reflected_set_v<E>[i]) {
return i + reflected_min_v<E>;
}
}
return reflected_min_v<E>;
}
inline constexpr int min_v = values_v<E>.empty() ? 0 : static_cast<int>(values_v<E>.front());
template <typename E>
inline constexpr int min_v = range_min<E>();
template <typename E>
inline constexpr int max_v = range_max<E>();
inline constexpr int max_v = values_v<E>.empty() ? 0 : static_cast<int>(values_v<E>.back());
template <typename E>
constexpr std::size_t range_size() noexcept {
@ -288,34 +274,9 @@ inline constexpr std::size_t size_v = range_size<E>();
template <typename E>
inline constexpr auto range_v = std::make_integer_sequence<int, size_v<E>>{};
template <typename E, int... I>
constexpr std::size_t count(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::count requires enum type.");
return (((n<E, static_cast<E>(I + min_v<E>)>().size() != 0) ? 1 : 0) + ...);
}
template <typename E>
inline constexpr std::size_t count_v = count<E>(range_v<E>);
template <typename E>
inline constexpr auto sequence_v = std::make_index_sequence<count_v<E>>{};
template <typename E, int... I>
constexpr auto values(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::values requires enum type.");
constexpr std::array<bool, size_v<E>> valid{{(n<E, static_cast<E>(I + min_v<E>)>().size() != 0)...}};
std::array<E, count_v<E>> values{};
for (std::size_t i = 0, v = 0; v < count_v<E>; ++i) {
if (valid[i]) {
values[v++] = static_cast<E>(static_cast<int>(i) + min_v<E>);
}
}
return values;
}
template <typename E>
using index_t = std::conditional_t<size_v<E> < (std::numeric_limits<std::uint8_t>::max)(), std::uint8_t, std::uint16_t>;
@ -333,17 +294,15 @@ constexpr auto indexes(std::integer_sequence<int, I...>) noexcept {
template <typename E, std::size_t... I>
constexpr auto names(std::index_sequence<I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::names requires enum type.");
constexpr auto vals = values<E>(range_v<E>);
return std::array<std::string_view, count_v<E>>{{name_v<E, vals[I]>...}};
return std::array<std::string_view, count_v<E>>{{name_v<E, values_v<E>[I]>...}};
}
template <typename E, std::size_t... I>
constexpr auto entries(std::index_sequence<I...>) noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::entries requires enum type.");
constexpr auto vals = values<E>(range_v<E>);
return std::array<std::pair<E, std::string_view>, count_v<E>>{{{vals[I], name_v<E, vals[I]>}...}};
return std::array<std::pair<E, std::string_view>, count_v<E>>{{{values_v<E>[I], name_v<E, values_v<E>[I]>}...}};
}
template <typename T, typename R>
@ -381,7 +340,7 @@ struct enum_traits<E, std::enable_if_t<is_enum_v<E>>> {
inline static constexpr bool is_scoped_enum = detail::is_scoped_enum<E>::value;
inline static constexpr std::size_t count = detail::count_v<E>;
inline static constexpr std::array<E, count> values = detail::values<E>(range_v<E>);
inline static constexpr std::array<E, count> values = detail::values_v<E>;
inline static constexpr std::array<std::string_view, count> names = detail::names<E>(sequence_v<E>);
inline static constexpr std::array<std::pair<E, std::string_view>, count> entries = detail::entries<E>(sequence_v<E>);