From 032516711334cb51ae3703f24321b6c50f4dfc37 Mon Sep 17 00:00:00 2001
From: neargye <neargye@gmail.com>
Date: Sat, 9 Oct 2021 02:13:00 +0300
Subject: [PATCH] add compile time get value

---
 include/magic_enum.hpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/magic_enum.hpp b/include/magic_enum.hpp
index 85aae45..50506da 100644
--- a/include/magic_enum.hpp
+++ b/include/magic_enum.hpp
@@ -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>> {