From 105c8f067e5e251ed7b75826f11de4527945398b Mon Sep 17 00:00:00 2001
From: neargye <neargye@gmail.com>
Date: Wed, 2 Oct 2019 17:06:36 +0500
Subject: [PATCH] remove is_fixed_enum non stable and useless

---
 README.md              |  1 -
 example/example.cpp    |  7 -------
 include/magic_enum.hpp | 15 ---------------
 test/test.cpp          |  7 -------
 4 files changed, 30 deletions(-)

diff --git a/README.md b/README.md
index 7657398..c859e74 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,6 @@ Header-only C++17 library provides static reflection for enums, work with any en
 * `enum_index` obtains index in enum value sequence from enum value.
 * `is_unscoped_enum` checks whether type is an [Unscoped enumeration](https://en.cppreference.com/w/cpp/language/enum#Unscoped_enumeration).
 * `is_scoped_enum` checks whether type is an [Scoped enumeration](https://en.cppreference.com/w/cpp/language/enum#Scoped_enumerations).
-* `is_fixed_enum` checks whether type is an [Fixed enumeration](https://en.cppreference.com/w/cpp/language/enum).
 * `underlying_type` improved UB-free "SFINAE-friendly" [std::underlying_type](https://en.cppreference.com/w/cpp/types/underlying_type).
 * `using namespace magic_enum::ostream_operators;` ostream operators for enums.
 * `using namespace magic_enum::bitwise_operators;` bitwise operators for enums.
diff --git a/example/example.cpp b/example/example.cpp
index 3f5a72e..2294a58 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -96,13 +96,6 @@ int main() {
   static_assert(magic_enum::is_scoped_enum_v<Color>);
   static_assert(magic_enum::is_scoped_enum_v<Flags>);
 
-  // Checks whether type is an Fixed enumeration.
-#if defined(_MSC_VER) && _MSC_VER != 1923 // MSVC bug, we can not check is enum fixed
-  static_assert(!magic_enum::is_fixed_enum_v<color>);
-  static_assert(magic_enum::is_fixed_enum_v<Color>);
-  static_assert(magic_enum::is_fixed_enum_v<Flags>);
-#endif
-
   // Enum pair (value enum, string enum name) sequence.
   constexpr auto color_entries = magic_enum::enum_entries<Color>();
   std::cout << "Colors entries:";
diff --git a/include/magic_enum.hpp b/include/magic_enum.hpp
index 5907f98..5087e3e 100644
--- a/include/magic_enum.hpp
+++ b/include/magic_enum.hpp
@@ -314,12 +314,6 @@ struct is_unscoped_enum : std::false_type {};
 template <typename T>
 struct is_unscoped_enum<T, true> : std::bool_constant<std::is_convertible_v<T, std::underlying_type_t<T>>> {};
 
-template <typename T, typename = T>
-struct is_fixed_enum : std::false_type {};
-
-template <typename T>
-struct is_fixed_enum<T, decltype(T{0})> : std::is_enum<T> {};
-
 template <typename T, bool = std::is_enum_v<T>>
 struct underlying_type {};
 
@@ -347,14 +341,6 @@ struct is_scoped_enum : detail::is_scoped_enum<T> {};
 template <typename T>
 inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
 
-// Checks whether T is an Fixed enumeration type.
-// Provides the member constant value which is equal to true, if T is an [Fixed enumeration](https://en.cppreference.com/w/cpp/language/enum) type. Otherwise, value is equal to false.
-template <typename T>
-struct is_fixed_enum : detail::is_fixed_enum<T> {};
-
-template <typename T>
-inline constexpr bool is_fixed_enum_v = is_fixed_enum<T>::value;
-
 // If T is a complete enumeration type, provides a member typedef type that names the underlying type of T.
 // Otherwise, if T is not an enumeration type, there is no member type. Otherwise (T is an incomplete enumeration type), the program is ill-formed.
 template <typename T>
@@ -375,7 +361,6 @@ struct enum_traits<E, std::enable_if_t<detail::is_enum_v<E>>> {
 
   inline static constexpr bool is_unscoped_enum = is_unscoped_enum_v<E>;
   inline static constexpr bool is_scoped_enum = is_scoped_enum_v<E>;
-  inline static constexpr bool is_fixed_enum = is_fixed_enum_v<E>;
 
   inline static constexpr std::size_t count = detail::count_v<E>;
   inline static constexpr std::array<E, count> values = detail::values<E>(detail::range_v<E>);
diff --git a/test/test.cpp b/test/test.cpp
index ad90205..1b8631b 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -453,13 +453,6 @@ TEST_CASE("type_traits") {
   REQUIRE(is_scoped_enum_v<Numbers>);
   REQUIRE_FALSE(is_scoped_enum_v<Directions>);
   REQUIRE_FALSE(is_scoped_enum_v<number>);
-
-#if defined(_MSC_VER) && _MSC_VER != 1923 // MSVC bug, we can not check is enum fixed
-  REQUIRE(is_fixed_enum_v<Color>);
-  REQUIRE(is_fixed_enum_v<Numbers>);
-  REQUIRE_FALSE(is_fixed_enum_v<Directions>);
-  REQUIRE(is_fixed_enum_v<number>);
-#endif
 }
 
 TEST_CASE("enum_traits") {