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add compile time get value

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neargye 2021-10-09 02:13:00 +03:00
parent 38f86e4d09
commit 0325167113
1 changed files with 20 additions and 0 deletions
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20
include/magic_enum.hpp
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@ -692,6 +692,16 @@ 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>> {
using D = std::decay_t<E>;
static_assert(detail::count_v<D> > 0, "magic_enum requires enum implementation and valid max and min.");
static_assert(I < detail::count_v<D>, "magic_enum::enum_value out of range.");
return detail::values_v<D>[I];
}
// Returns std::array with enum values, sorted by enum value.
template <typename E>
[[nodiscard]] constexpr auto enum_values() noexcept -> detail::enable_if_enum_t<E, detail::values_t<E>> {
@ -925,6 +935,16 @@ template <typename E>
}
}
// Returns enum-flags 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>> {
using D = std::decay_t<E>;
static_assert(detail::count_v<D> > 0, "magic_enum::flags requires enum implementation and valid max and min.");
static_assert(I < detail::count_v<D>, "magic_enum::flags::enum_value out of range.");
return detail::values_v<D, true>[I];
}
// Returns std::array with enum-flags values, sorted by enum-flags value.
template <typename E>
[[nodiscard]] constexpr auto enum_values() noexcept -> detail::enable_if_enum_t<E, detail::values_t<E, true>> {