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enum_range more snifae-friendly

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This commit is contained in:
neargye 2022-01-27 19:33:37 +02:00
parent 9ed19fb9e9
commit 08089871af
1 changed files with 14 additions and 4 deletions
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18
include/magic_enum.hpp
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@ -160,6 +160,18 @@ struct has_is_flags : std::false_type {};
template <typename T>
struct has_is_flags<T, std::void_t<decltype(customize::enum_range<T>::is_flags)>> : std::bool_constant<std::is_same_v<bool, std::decay_t<decltype(customize::enum_range<T>::is_flags)>>> {};
template <typename T, typename = void>
struct range_min : std::integral_constant<int, MAGIC_ENUM_RANGE_MIN> {};
template <typename T>
struct range_min<T, std::void_t<decltype(customize::enum_range<T>::min)>> : std::integral_constant<decltype(customize::enum_range<T>::min), customize::enum_range<T>::min> {};
template <typename T, typename = void>
struct range_max : std::integral_constant<int, MAGIC_ENUM_RANGE_MAX> {};
template <typename T>
struct range_max<T, std::void_t<decltype(customize::enum_range<T>::max)>> : std::integral_constant<decltype(customize::enum_range<T>::max), customize::enum_range<T>::max> {};
struct char_equal_to {
constexpr bool operator()(char lhs, char rhs) const noexcept {
return lhs == rhs;
@ -390,11 +402,10 @@ constexpr int reflected_min() noexcept {
if constexpr (IsFlags) {
return 0;
} else {
constexpr auto lhs = customize::enum_range<E>::min;
constexpr auto lhs = range_min<E>::value;
constexpr auto rhs = (std::numeric_limits<U>::min)();
if constexpr (cmp_less(rhs, lhs)) {
static_assert(!is_valid<E, value<E, lhs - 1, IsFlags>(0)>(), "magic_enum::enum_range detects enum value smaller than min range size.");
return lhs;
} else {
return rhs;
@ -409,11 +420,10 @@ constexpr int reflected_max() noexcept {
if constexpr (IsFlags) {
return std::numeric_limits<U>::digits - 1;
} else {
constexpr auto lhs = customize::enum_range<E>::max;
constexpr auto lhs = range_max<E>::value;
constexpr auto rhs = (std::numeric_limits<U>::max)();
if constexpr (cmp_less(lhs, rhs)) {
static_assert(!is_valid<E, value<E, lhs + 1, IsFlags>(0)>(), "magic_enum::enum_range detects enum value larger than max range size.");
return lhs;
} else {
return rhs;