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add compile time enum_index (#159)

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Daniil Goncharov 2022-03-09 10:07:09 +02:00 • committed by GitHub
parent 04a3d32d0f
commit b0c0e02bdc
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3 changed files with 56 additions and 28 deletions
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18
include/magic_enum.hpp
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@ -661,7 +661,7 @@ using underlying_type_t = typename underlying_type<T>::type;
template <typename E>
[[nodiscard]] constexpr auto enum_type_name() noexcept -> detail::enable_if_enum_t<E, string_view> {
constexpr string_view name = detail::type_name_v<std::decay_t<E>>;
static_assert(name.size() > 0, "Enum type does not have a name.");
static_assert(!name.empty(), "magic_enum::enum_type_name enum type does not have a name.");
return name;
}
@ -691,7 +691,10 @@ template <typename E>
// Returns enum value at specified index.
template <typename E, std::size_t I>
[[nodiscard]] constexpr auto enum_value() noexcept -> detail::enable_if_enum_t<E, std::decay_t<E>> {
return enum_value<std::decay_t<E>>(I);
using D = std::decay_t<E>;
static_assert(I < detail::count_v<D>, "magic_enum::enum_value out of range.");
return enum_value<D>(I);
}
// Returns std::array with enum values, sorted by enum value.
@ -705,7 +708,7 @@ template <typename E>
template <auto V>
[[nodiscard]] constexpr auto enum_name() noexcept -> detail::enable_if_enum_t<decltype(V), string_view> {
constexpr string_view name = detail::enum_name_v<std::decay_t<decltype(V)>, V>;
static_assert(name.size() > 0, "Enum value does not have a name.");
static_assert(!name.empty(), "magic_enum::enum_name enum value does not have a name.");
return name;
}
@ -888,6 +891,15 @@ template <typename E>
return {}; // Invalid value or out of range.
}
// Obtains index in enum values from static storage enum variable.
template <auto V>
[[nodiscard]] constexpr auto enum_index() noexcept -> detail::enable_if_enum_t<decltype(V), std::size_t> {
constexpr auto index = enum_index<std::decay_t<decltype(V)>>(V);
static_assert(index.has_value(), "magic_enum::enum_index enum value does not have a index.");
return index.value();
}
// Checks whether enum contains enumerator with such enum value.
template <typename E>
[[nodiscard]] constexpr auto enum_contains(E value) noexcept -> detail::enable_if_enum_t<E, bool> {