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improve name_impl, ostream_operators

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This commit is contained in:
terik23 2019-07-25 00:37:59 +05:00
parent 99e4d7c7aa
commit 172c685547
2 changed files with 17 additions and 13 deletions
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16
include/magic_enum.hpp
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@ -147,11 +147,11 @@ template <typename E>
inline constexpr auto strings_v = strings_impl<E>(range_v<E>);
template <typename E>
[[nodiscard]] constexpr std::string_view name_impl(int value) noexcept {
[[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>((value - min_v<E>)); i < strings.size()) {
if (auto i = static_cast<std::size_t>((static_cast<int>(value) - min_v<E>)); i < strings.size()) {
return strings[i];
}
@ -291,7 +291,7 @@ 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()) {
if (detail::name_impl<D>(static_cast<D>(value)).empty()) {
return std::nullopt; // Invalid value or out of range.
}
@ -349,7 +349,7 @@ template <typename E, typename D = detail::enable_if_enum_t<E>>
[[nodiscard]] constexpr std::string_view enum_name(E value) noexcept {
static_assert(detail::check_enum_v<E, D>, "magic_enum::enum_name requires enum type.");
return detail::name_impl<D>(static_cast<int>(value));
return detail::name_impl<D>(value);
}
// Obtains string enum name sequence.
@ -378,10 +378,12 @@ template <class Char, class Traits, typename E, typename D = detail::enable_if_e
std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, E value) {
static_assert(detail::check_enum_v<E, D>, "magic_enum::ostream_operators::operator<< requires enum type.");
if (auto name = detail::name_impl<D>(static_cast<int>(value)); !name.empty()) {
if (auto name = detail::name_impl<D>(value); !name.empty()) {
for (auto c : name) {
os.put(c);
}
} else {
os << static_cast<std::underlying_type_t<D>>(value);
}
return os;
@ -392,10 +394,12 @@ std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& o
static_assert(detail::check_enum_v<E, D>, "magic_enum::ostream_operators::operator<< requires enum type.");
if (value.has_value()) {
if (auto name = detail::name_impl<D>(static_cast<int>(value.value())); !name.empty()) {
if (auto name = detail::name_impl<D>(value.value()); !name.empty()) {
for (auto c : name) {
os.put(c);
}
} else {
os << static_cast<std::underlying_type_t<D>>(value.value());
}
}