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fix #216, fix #199

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neargye 2022-11-07 21:00:16 +04:00
parent 596f00c0db
commit 8bd403f888
10 changed files with 502 additions and 298 deletions
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405
include/magic_enum.hpp
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@ -171,6 +171,11 @@ namespace detail {
template <auto V, typename E = std::decay_t<decltype(V)>, std::enable_if_t<std::is_enum_v<E>, int> = 0>
using enum_constant = std::integral_constant<E, V>;
enum class value_type {
default_value,
flags_value
};
template <typename... T>
inline constexpr bool always_false_v = false;
@ -695,8 +700,14 @@ struct enable_if_enum<true, R> {
static_assert(supported<R>::value, "magic_enum unsupported compiler (https://github.com/Neargye/magic_enum#compiler-compatibility).");
};
template <typename T, typename R, typename BinaryPredicate = std::equal_to<>>
using enable_if_t = typename enable_if_enum<std::is_enum_v<std::decay_t<T>> && std::is_invocable_r_v<bool, BinaryPredicate, char, char>, R>::type;
template <typename T, typename R, typename BinaryPredicate = std::equal_to<>, typename D = std::decay_t<T>>
using enable_if_t = typename enable_if_enum<std::is_enum_v<D> && std::is_invocable_r_v<bool, BinaryPredicate, char, char>, R>::type;
template <typename T, typename R, value_type VT, typename BinaryPredicate = std::equal_to<>, typename D = std::decay_t<T>>
using enable_if_default_t = typename enable_if_enum<std::is_enum_v<D> && VT == value_type::default_value && std::is_invocable_r_v<bool, BinaryPredicate, char, char>, R>::type;
template <typename T, typename R, value_type VT, typename BinaryPredicate = std::equal_to<>, typename D = std::decay_t<T>>
using enable_if_flags_t = typename enable_if_enum<std::is_enum_v<D> && VT == value_type::flags_value && std::is_invocable_r_v<bool, BinaryPredicate, char, char>, R>::type;
template <typename T, std::enable_if_t<std::is_enum_v<std::decay_t<T>>, int> = 0>
using enum_concept = T;
@ -719,10 +730,7 @@ struct underlying_type {};
template <typename T>
struct underlying_type<T, true> : std::underlying_type<std::decay_t<T>> {};
#if defined(MAGIC_ENUM_NO_HASH)
template <typename T>
inline constexpr bool has_hash = false;
#else
#if defined(MAGIC_ENUM_ENABLE_HASH)
template <typename T>
inline constexpr bool has_hash = true;
@ -846,7 +854,8 @@ constexpr R invoke_r(F&& f, Args&&... args) noexcept(std::is_nothrow_invocable_r
}
enum class case_call_t {
index, value
index,
value
};
template <typename T = void>
@ -856,7 +865,7 @@ template <>
inline constexpr auto default_result_type_lambda<void> = []() noexcept {};
template <auto* Arr, typename Hash>
constexpr bool no_duplicate() noexcept {
constexpr bool has_duplicate() noexcept {
using value_t = std::decay_t<decltype((*Arr)[0])>;
using hash_value_t = std::invoke_result_t<Hash, value_t>;
std::array<hash_value_t, Arr->size()> hashes{};
@ -887,41 +896,43 @@ constexpr bool no_duplicate() noexcept {
T(192)T(193)T(194)T(195)T(196)T(197)T(198)T(199)T(200)T(201)T(202)T(203)T(204)T(205)T(206)T(207)T(208)T(209)T(210)T(211)T(212)T(213)T(214)T(215)T(216)T(217)T(218)T(219)T(220)T(221)T(222)T(223) \
T(224)T(225)T(226)T(227)T(228)T(229)T(230)T(231)T(232)T(233)T(234)T(235)T(236)T(237)T(238)T(239)T(240)T(241)T(242)T(243)T(244)T(245)T(246)T(247)T(248)T(249)T(250)T(251)T(252)T(253)T(254)T(255)
#define MAGIC_ENUM_CASE(val) \
case cases[val]: \
if constexpr ((val) + Page < size) { \
if (!pred(values[val + Page], searched)) { \
break; \
} \
if constexpr (CallValue == case_call_t::index) { \
if constexpr (std::is_invocable_r_v<result_t, Lambda, std::integral_constant<std::size_t, val + Page>>) { \
return detail::invoke_r<result_t>(std::forward<Lambda>(lambda), std::integral_constant<std::size_t, val + Page>{}); \
} else if constexpr (std::is_invocable_v<Lambda, std::integral_constant<std::size_t, val + Page>>) { \
assert(false && "magic_enum::detail::constexpr_switch wrong result type."); \
} \
} else if constexpr (CallValue == case_call_t::value) { \
if constexpr (std::is_invocable_r_v<result_t, Lambda, enum_constant<values[val + Page]>>) { \
return detail::invoke_r<result_t>(std::forward<Lambda>(lambda), enum_constant<values[val + Page]>{}); \
} else if constexpr (std::is_invocable_r_v<result_t, Lambda, enum_constant<values[val + Page]>>) { \
assert(false && "magic_enum::detail::constexpr_switch wrong result type."); \
} \
} \
break; \
#define MAGIC_ENUM_CASE(val) \
case cases[val]: \
if constexpr ((val) + Page < size) { \
if (!pred(values[val + Page], searched)) { \
break; \
} \
if constexpr (CallValue == case_call_t::index) { \
if constexpr (std::is_invocable_r_v<result_t, Lambda, std::integral_constant<std::size_t, val + Page>>) { \
return detail::invoke_r<result_t>(std::forward<Lambda>(lambda), std::integral_constant<std::size_t, val + Page>{}); \
} else if constexpr (std::is_invocable_v<Lambda, std::integral_constant<std::size_t, val + Page>>) { \
assert(false && "magic_enum::detail::constexpr_switch wrong result type."); \
} \
} else if constexpr (CallValue == case_call_t::value) { \
if constexpr (std::is_invocable_r_v<result_t, Lambda, enum_constant<values[val + Page]>>) { \
return detail::invoke_r<result_t>(std::forward<Lambda>(lambda), enum_constant<values[val + Page]>{}); \
} else if constexpr (std::is_invocable_r_v<result_t, Lambda, enum_constant<values[val + Page]>>) { \
assert(false && "magic_enum::detail::constexpr_switch wrong result type."); \
} \
} \
break; \
} else [[fallthrough]];
template <auto* GlobValues,
case_call_t CallValue,
std::size_t Page = 0,
typename Hash = constexpr_hash_t<typename std::decay_t<decltype(*GlobValues)>::value_type>,
typename Lambda, typename ResultGetterType = decltype(default_result_type_lambda<>),
typename BinaryPredicate = std::equal_to<>>
typename BinaryPredicate = std::equal_to<>,
typename Lambda,
typename ResultGetterType>
constexpr std::invoke_result_t<ResultGetterType> constexpr_switch(
Lambda&& lambda,
typename std::decay_t<decltype(*GlobValues)>::value_type searched,
ResultGetterType&& def = default_result_type_lambda<>,
ResultGetterType&& def,
BinaryPredicate&& pred = {}) {
using result_t = std::invoke_result_t<ResultGetterType>;
using hash_t = std::conditional_t<no_duplicate<GlobValues, Hash>(), Hash, typename Hash::secondary_hash>;
using hash_t = std::conditional_t<has_duplicate<GlobValues, Hash>(), Hash, typename Hash::secondary_hash>;
static_assert(has_duplicate<GlobValues, hash_t>(), "magic_enum::detail::constexpr_switch duplicated hash found, please report it: https://github.com/Neargye/magic_enum/issues.");
constexpr std::array values = *GlobValues;
constexpr std::size_t size = values.size();
constexpr std::array cases = calculate_cases<GlobValues, hash_t>(Page);
@ -939,28 +950,36 @@ constexpr std::invoke_result_t<ResultGetterType> constexpr_switch(
#undef MAGIC_ENUM_FOR_EACH_256
#undef MAGIC_ENUM_CASE
#else
template <typename T>
inline constexpr bool has_hash = false;
#endif
template <typename E, typename Lambda, std::size_t... I>
constexpr auto for_each(Lambda&& lambda, std::index_sequence<I...>) {
template <typename E, typename F, std::size_t... I>
constexpr auto for_each(F&& f, std::index_sequence<I...>) {
static_assert(is_enum_v<E>, "magic_enum::detail::for_each requires enum type.");
constexpr bool has_void_return = (std::is_void_v<std::invoke_result_t<Lambda, enum_constant<values_v<E>[I]>>> || ...);
constexpr bool all_same_return = (std::is_same_v<std::invoke_result_t<Lambda, enum_constant<values_v<E>[0]>>, std::invoke_result_t<Lambda, enum_constant<values_v<E>[I]>>> && ...);
constexpr bool has_void_return = (std::is_void_v<std::invoke_result_t<F, enum_constant<values_v<E>[I]>>> || ...);
constexpr bool all_same_return = (std::is_same_v<std::invoke_result_t<F, enum_constant<values_v<E>[0]>>, std::invoke_result_t<F, enum_constant<values_v<E>[I]>>> && ...);
if constexpr (has_void_return) {
(lambda(enum_constant<values_v<E>[I]>{}), ...);
(f(enum_constant<values_v<E>[I]>{}), ...);
} else if constexpr (all_same_return) {
return std::array{lambda(enum_constant<values_v<E>[I]>{})...};
return std::array{f(enum_constant<values_v<E>[I]>{})...};
} else {
return std::tuple{lambda(enum_constant<values_v<E>[I]>{})...};
return std::tuple{f(enum_constant<values_v<E>[I]>{})...};
}
}
template <typename E, typename Lambda, std::size_t... I>
template <typename E, typename F, std::size_t... I>
constexpr bool all_invocable(std::index_sequence<I...>) {
static_assert(is_enum_v<E>, "magic_enum::detail::all_invocable requires enum type.");
return (std::is_invocable_v<Lambda, enum_constant<values_v<E>[I]>> && ...);
if constexpr (count_v<E> == 0) {
return false;
} else {
return (std::is_invocable_v<F, enum_constant<values_v<E>[I]>> && ...);
}
}
} // namespace magic_enum::detail
@ -1066,18 +1085,18 @@ template <typename E>
if constexpr (detail::count_v<D> == 0) {
return {}; // Empty enum.
} else if constexpr (detail::is_sparse_v<D> || detail::is_flags_v<D>) {
#if defined(MAGIC_ENUM_NO_HASH)
#if defined(MAGIC_ENUM_ENABLE_HASH)
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::index>(
[](std::size_t i) { return optional<std::size_t>{i}; },
value,
detail::default_result_type_lambda<optional<std::size_t>>);
#else
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (enum_value<D>(i) == value) {
return i;
}
}
return {}; // Invalid value or out of range.
#else
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::index>(
[](std::size_t i) { return optional<std::size_t>{i}; },
value,
detail::default_result_type_lambda<optional<std::size_t>>);
#endif
} else {
const auto v = static_cast<U>(value);
@ -1109,8 +1128,8 @@ template <auto V>
// Returns name from enum value.
// If enum value does not have name or value out of range, returns empty string.
template <typename E>
[[nodiscard]] constexpr auto enum_name(E value) noexcept -> detail::enable_if_t<E, string_view> {
template <typename E, detail::value_type VT = detail::value_type::default_value>
[[nodiscard]] constexpr auto enum_name(E value) noexcept -> detail::enable_if_default_t<E, string_view, VT> {
using D = std::decay_t<E>;
if (const auto i = enum_index<D>(value)) {
@ -1119,38 +1138,61 @@ template <typename E>
return {};
}
// Returns name from enum value.
// If enum value does not have name or value out of range, returns empty string.
template <detail::value_type VT, typename E>
[[nodiscard]] constexpr auto enum_name(E value) -> detail::enable_if_default_t<E, string_view, VT> {
using D = std::decay_t<E>;
return enum_name<D, VT>(value);
}
// Returns name from enum value.
// If enum value does not have name or value out of range, returns empty string.
template <typename E, detail::value_type VT>
[[nodiscard]] auto enum_name(E value) -> detail::enable_if_flags_t<E, string, VT> {
using D = std::decay_t<E>;
using U = underlying_type_t<D>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_name requires enum-flags type.");
string name;
auto check_value = U{0};
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (const auto v = static_cast<U>(enum_value<D>(i)); (static_cast<U>(value) & v) != 0) {
check_value |= v;
const auto n = detail::names_v<D>[i];
if (!name.empty()) {
name.append(1, '|');
}
name.append(n.data(), n.size());
}
}
if (check_value != 0 && check_value == static_cast<U>(value)) {
return name;
}
return {}; // Invalid value or out of range.
}
// Returns name from enum value.
// If enum value does not have name or value out of range, returns empty string.
template <detail::value_type VT, typename E>
[[nodiscard]] auto enum_name(E value) -> detail::enable_if_flags_t<E, string, VT> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_name requires enum-flags type.");
return enum_name<D, VT>(value);
}
// Returns name from enum-flags value.
// If enum-flags value does not have name or value out of range, returns empty string.
template <typename E>
[[nodiscard]] auto enum_flags_name(E value) -> detail::enable_if_t<E, string> {
using D = std::decay_t<E>;
using U = underlying_type_t<D>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_name requires enum-flags type.");
if constexpr (detail::is_flags_v<D>) {
string name;
auto check_value = U{0};
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (const auto v = static_cast<U>(enum_value<D>(i)); (static_cast<U>(value) & v) != 0) {
check_value |= v;
const auto n = detail::names_v<D>[i];
if (!name.empty()) {
name.append(1, '|');
}
name.append(n.data(), n.size());
}
}
if (check_value != 0 && check_value == static_cast<U>(value)) {
return name;
}
return {}; // Invalid value or out of range.
} else {
if (const auto name = enum_name<D>(value); !name.empty()) {
return {name.data(), name.size()};
}
return {}; // Invalid value or out of range.
}
return enum_name<D, detail::value_type::flags_value>(value);
}
// Returns std::array with names, sorted by enum value.
@ -1170,15 +1212,15 @@ inline constexpr auto case_insensitive = detail::case_insensitive{};
// Obtains enum value from integer value.
// Returns optional with enum value.
template <typename E>
template <typename E, detail::value_type VT = detail::value_type::default_value>
[[nodiscard]] constexpr auto enum_cast(underlying_type_t<E> value) noexcept -> detail::enable_if_t<E, optional<std::decay_t<E>>> {
using D = std::decay_t<E>;
using U = underlying_type_t<D>;
if constexpr (detail::count_v<D> == 0) {
return {}; // Empty enum.
} else if constexpr (detail::is_sparse_v<D>) {
if constexpr (detail::is_flags_v<D>) {
} else if constexpr (VT == detail::value_type::flags_value && detail::is_flags_v<D>) {
if constexpr (detail::is_sparse_v<D>) {
auto check_value = U{0};
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (const auto v = static_cast<U>(enum_value<D>(i)); (value & v) != 0) {
@ -1191,42 +1233,51 @@ template <typename E>
}
return {}; // Invalid value or out of range.
} else {
#if defined(MAGIC_ENUM_NO_HASH)
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (value == static_cast<U>(enum_value<D>(i))) {
return static_cast<D>(value);
}
constexpr auto min = detail::min_v<D>;
constexpr auto max = detail::values_ors<D>();
if (value >= min && value <= max) {
return static_cast<D>(value);
}
return {}; // Invalid value or out of range.
#else
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::value>(
[](D v) { return optional<D>{v}; },
static_cast<D>(value),
detail::default_result_type_lambda<optional<D>>);
#endif
}
} else {
constexpr auto min = detail::min_v<D>;
constexpr auto max = detail::is_flags_v<D> ? detail::values_ors<D>() : detail::max_v<D>;
if (value >= min && value <= max) {
return static_cast<D>(value);
#if defined(MAGIC_ENUM_ENABLE_HASH)
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::value>(
[](D v) { return optional<D>{v}; },
static_cast<D>(value),
detail::default_result_type_lambda<optional<D>>);
#else
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (value == static_cast<U>(enum_value<D>(i))) {
return static_cast<D>(value);
}
}
return {}; // Invalid value or out of range.
#endif
}
}
// Obtains enum-flags value from integer value.
// Returns optional with enum-flags value.
template <typename E>
[[nodiscard]] constexpr auto enum_flags_cast(underlying_type_t<E> value) noexcept -> detail::enable_if_t<E, optional<std::decay_t<E>>> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_cast requires enum-flags type.");
return enum_cast<D, detail::value_type::flags_value>(value);
}
// Obtains enum value from name.
// Returns optional with enum value.
template <typename E, typename BinaryPredicate = std::equal_to<>>
[[nodiscard]] constexpr auto enum_cast(string_view value, [[maybe_unused]] BinaryPredicate&& p = {}) noexcept(detail::is_nothrow_invocable<BinaryPredicate>()) -> detail::enable_if_t<E, optional<std::decay_t<E>>, BinaryPredicate> {
static_assert(std::is_invocable_r_v<bool, BinaryPredicate, char, char>, "magic_enum::enum_cast requires bool(char, char) invocable predicate.");
template <typename E, detail::value_type VT = detail::value_type::default_value, typename BinaryPredicate = std::equal_to<>>
[[nodiscard]] constexpr auto enum_cast(string_view value, [[maybe_unused]] BinaryPredicate p = {}) noexcept(detail::is_nothrow_invocable<BinaryPredicate>()) -> detail::enable_if_t<E, optional<std::decay_t<E>>, BinaryPredicate> {
using D = std::decay_t<E>;
using U = underlying_type_t<D>;
if constexpr (detail::count_v<D> == 0) {
return {}; // Empty enum.
} else if constexpr (detail::is_flags_v<D>) {
} else if constexpr (VT == detail::value_type::flags_value && detail::is_flags_v<D>) {
auto result = U{0};
while (!value.empty()) {
const auto d = detail::find(value, '|');
@ -1249,21 +1300,14 @@ template <typename E, typename BinaryPredicate = std::equal_to<>>
return static_cast<D>(result);
}
return {}; // Invalid value or out of range.
} else if constexpr (detail::count_v<D> > 0) {
if constexpr (detail::is_default_predicate<BinaryPredicate>()) {
#if defined(MAGIC_ENUM_NO_HASH)
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
if (detail::cmp_equal(value, detail::names_v<D>[i], p)) {
return enum_value<D>(i);
}
}
return {}; // Invalid value or out of range.
#else
return detail::constexpr_switch<&detail::names_v<D>, detail::case_call_t::index>(
[](std::size_t i) { return optional<D>{detail::values_v<D>[i]}; },
value,
detail::default_result_type_lambda<optional<D>>,
[&p](string_view lhs, string_view rhs) { return detail::cmp_equal(lhs, rhs, p); });
} else {
if constexpr (detail::is_default_predicate<BinaryPredicate>() && detail::has_hash<D>) {
#if defined(MAGIC_ENUM_ENABLE_HASH)
return detail::constexpr_switch<&detail::names_v<D>, detail::case_call_t::index>(
[](std::size_t i) { return optional<D>{detail::values_v<D>[i]}; },
value,
detail::default_result_type_lambda<optional<D>>,
[&p](string_view lhs, string_view rhs) { return detail::cmp_equal(lhs, rhs, p); });
#endif
} else {
for (std::size_t i = 0; i < detail::count_v<D>; ++i) {
@ -1276,113 +1320,84 @@ template <typename E, typename BinaryPredicate = std::equal_to<>>
}
}
// Checks whether enum contains enumerator with such enum value.
template <typename E>
// Obtains enum-flags value from name.
// Returns optional with enum-flags value.
template <typename E, typename BinaryPredicate = std::equal_to<>>
[[nodiscard]] constexpr auto enum_flags_cast(string_view value, [[maybe_unused]] BinaryPredicate p = {}) noexcept(detail::is_nothrow_invocable<BinaryPredicate>()) -> detail::enable_if_t<E, optional<std::decay_t<E>>, BinaryPredicate> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_cast requires enum-flags type.");
return enum_cast<D, detail::value_type::flags_value>(value, std::move(p));
}
// Checks whether enum contains value with such value.
template <typename E, detail::value_type VT = detail::value_type::default_value>
[[nodiscard]] constexpr auto enum_contains(E value) noexcept -> detail::enable_if_t<E, bool> {
using D = std::decay_t<E>;
using U = underlying_type_t<D>;
return static_cast<bool>(enum_cast<D>(static_cast<U>(value)));
return static_cast<bool>(enum_cast<D, VT>(static_cast<U>(value)));
}
// Checks whether enum contains enumerator with such integer value.
// Checks whether enum-flags contains value with such value.
template <typename E>
[[nodiscard]] constexpr auto enum_flags_contains(E value) noexcept -> detail::enable_if_t<E, bool> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_contains requires enum-flags type.");
return enum_contains<D, detail::value_type::flags_value>(value);
}
// Checks whether enum contains value with such integer value.
template <typename E, detail::value_type VT = detail::value_type::default_value>
[[nodiscard]] constexpr auto enum_contains(underlying_type_t<E> value) noexcept -> detail::enable_if_t<E, bool> {
using D = std::decay_t<E>;
return static_cast<bool>(enum_cast<D>(value));
return static_cast<bool>(enum_cast<D, VT>(value));
}
// Checks whether enum-flags contains value with such integer value.
template <typename E>
[[nodiscard]] constexpr auto enum_flags_contains(underlying_type_t<E> value) noexcept -> detail::enable_if_t<E, bool> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_contains requires enum-flags type.");
return enum_contains<D, detail::value_type::flags_value>(value);
}
// Checks whether enum contains enumerator with such name.
template <typename E, detail::value_type VT = detail::value_type::default_value, typename BinaryPredicate = std::equal_to<>>
[[nodiscard]] constexpr auto enum_contains(string_view value, BinaryPredicate p = {}) noexcept(detail::is_nothrow_invocable<BinaryPredicate>()) -> detail::enable_if_t<E, bool, BinaryPredicate> {
using D = std::decay_t<E>;
return static_cast<bool>(enum_cast<D, VT>(value, std::move(p)));
}
// Checks whether enum-flags contains enumerator with such name.
template <typename E, typename BinaryPredicate = std::equal_to<>>
[[nodiscard]] constexpr auto enum_contains(string_view value, BinaryPredicate&& p = {}) noexcept(detail::is_nothrow_invocable<BinaryPredicate>()) -> detail::enable_if_t<E, bool, BinaryPredicate> {
static_assert(std::is_invocable_r_v<bool, BinaryPredicate, char, char>, "magic_enum::enum_contains requires bool(char, char) invocable predicate.");
[[nodiscard]] constexpr auto enum_flags_contains(string_view value, BinaryPredicate p = {}) noexcept(detail::is_nothrow_invocable<BinaryPredicate>()) -> detail::enable_if_t<E, bool, BinaryPredicate> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_contains requires enum-flags type.");
return static_cast<bool>(enum_cast<D>(value, std::forward<BinaryPredicate>(p)));
return enum_contains<D, detail::value_type::flags_value>(value, std::move(p));
}
template <typename Result = void, typename E, typename Lambda>
constexpr auto enum_switch(Lambda&& lambda, E value) -> detail::enable_if_t<E, Result> {
using D = std::decay_t<E>;
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires no defined MAGIC_ENUM_NO_HASH");
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::value>(
std::forward<Lambda>(lambda),
value,
detail::default_result_type_lambda<Result>);
}
template <typename Result, typename E, typename Lambda>
constexpr auto enum_switch(Lambda&& lambda, E value, Result&& result) -> detail::enable_if_t<E, Result> {
using D = std::decay_t<E>;
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires no defined MAGIC_ENUM_NO_HASH");
return detail::constexpr_switch<&detail::values_v<D>, detail::case_call_t::value>(
std::forward<Lambda>(lambda),
value,
[&result] { return std::forward<Result>(result); });
}
template <typename E, typename Result = void, typename BinaryPredicate = std::equal_to<>, typename Lambda>
constexpr auto enum_switch(Lambda&& lambda, string_view name, BinaryPredicate&& p = {}) -> detail::enable_if_t<E, Result, BinaryPredicate> {
static_assert(std::is_invocable_r_v<bool, BinaryPredicate, char, char>, "magic_enum::enum_switch requires bool(char, char) invocable predicate.");
using D = std::decay_t<E>;
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires no defined MAGIC_ENUM_NO_HASH");
if (const auto v = enum_cast<D>(name, std::forward<BinaryPredicate>(p))) {
return enum_switch<Result, D>(std::forward<Lambda>(lambda), *v);
}
return detail::default_result_type_lambda<Result>();
}
template <typename E, typename Result, typename BinaryPredicate = std::equal_to<>, typename Lambda>
constexpr auto enum_switch(Lambda&& lambda, string_view name, Result&& result, BinaryPredicate&& p = {}) -> detail::enable_if_t<E, Result, BinaryPredicate> {
static_assert(std::is_invocable_r_v<bool, BinaryPredicate, char, char>, "magic_enum::enum_switch requires bool(char, char) invocable predicate.");
using D = std::decay_t<E>;
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires no defined MAGIC_ENUM_NO_HASH");
if (const auto v = enum_cast<D>(name, std::forward<BinaryPredicate>(p))) {
return enum_switch<Result, D>(std::forward<Lambda>(lambda), *v, std::forward<Result>(result));
}
return std::forward<Result>(result);
}
template <typename E, typename Result = void, typename Lambda>
constexpr auto enum_switch(Lambda&& lambda, underlying_type_t<E> value) -> detail::enable_if_t<E, Result> {
using D = std::decay_t<E>;
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires no defined MAGIC_ENUM_NO_HASH");
if (const auto v = enum_cast<D>(value)) {
return enum_switch<Result, D>(std::forward<Lambda>(lambda), *v);
}
return detail::default_result_type_lambda<Result>();
}
template <typename E, typename Result, typename Lambda>
constexpr auto enum_switch(Lambda&& lambda, underlying_type_t<E> value, Result&& result) -> detail::enable_if_t<E, Result> {
using D = std::decay_t<E>;
static_assert(detail::has_hash<D>, "magic_enum::enum_switch requires no defined MAGIC_ENUM_NO_HASH");
if (const auto v = enum_cast<D>(value)) {
return enum_switch<Result, D>(std::forward<Lambda>(lambda), *v, std::forward<Result>(result));
}
return std::forward<Result>(result);
}
template <typename E, typename Lambda, detail::enable_if_t<E, int> = 0>
constexpr auto enum_for_each(Lambda&& lambda) {
template <typename E, typename F, detail::enable_if_t<E, int> = 0>
constexpr auto enum_for_each(F&& f) {
using D = std::decay_t<E>;
static_assert(std::is_enum_v<D>, "magic_enum::enum_for_each requires enum type.");
constexpr auto sep = std::make_index_sequence<detail::count_v<D>>{};
if constexpr (detail::all_invocable<D, Lambda>(sep)) {
return detail::for_each<D>(std::forward<Lambda>(lambda), sep);
if constexpr (detail::all_invocable<D, F>(sep)) {
return detail::for_each<D>(std::forward<F>(f), sep);
} else {
static_assert(detail::always_false_v<D>, "magic_enum::enum_for_each requires invocable of all enum value.");
}
}
template <bool AsFlags = true>
inline constexpr auto as_flags = AsFlags ? detail::value_type::flags_value : detail::value_type::default_value;
#if !defined(MAGIC_ENUM_NO_STREAMS)
namespace ostream_operators {
@ -1393,7 +1408,7 @@ std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& o
using U = underlying_type_t<D>;
if constexpr (detail::supported<D>::value) {
if (const auto name = enum_flags_name<D>(value); !name.empty()) {
if (const auto name = enum_name<D, as_flags<detail::is_flags_v<D>>>(value); !name.empty()) {
for (const auto c : name) {
os.put(c);
}
@ -1418,7 +1433,7 @@ std::basic_istream<Char, Traits>& operator>>(std::basic_istream<Char, Traits>& i
std::basic_string<Char, Traits> s;
is >> s;
if (const auto v = enum_cast<D>(s)) {
if (const auto v = enum_cast<D, as_flags<detail::is_flags_v<D>>>(s)) {
value = *v;
} else {
is.setstate(std::basic_ios<Char>::failbit);