__ __ _ ______ _____
| \/ | (_) | ____| / ____|_ _
| \ / | __ _ __ _ _ ___ | |__ _ __ _ _ _ __ ___ | | _| |_ _| |_
| |\/| |/ _` |/ _` | |/ __| | __| | '_ \| | | | '_ ` _ \ | | |_ _|_ _|
| | | | (_| | (_| | | (__ | |____| | | | |_| | | | | | | | |____|_| |_|
|_| |_|\__,_|\__, |_|\___| |______|_| |_|\__,_|_| |_| |_| \_____|
__/ |
|___/
Header-only C++17 library provides static reflection for enums, work with any enum type without any macro or boilerplate code.
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Enum value to string
Color color = Color::RED; auto color_name = magic_enum::enum_name(color); // color_name -> "RED"
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String to enum value
std::string color_name{"GREEN"}; auto color = magic_enum::enum_cast<Color>(color_name); if (color.has_value()) { // color.value() -> Color::GREEN } // case insensitive enum_cast auto color = magic_enum::enum_cast<Color>(value, magic_enum::case_insensitive); // enum_cast with BinaryPredicate auto color = magic_enum::enum_cast<Color>(value, [](char lhs, char rhs) { return std::tolower(lhs) == std::tolower(rhs); } // enum_cast with default auto color_or_default = magic_enum::enum_cast<Color>(value).value_or(Color::NONE);
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Integer to enum value
int color_integer = 2; auto color = magic_enum::enum_cast<Color>(color_integer); if (color.has_value()) { // color.value() -> Color::BLUE } auto color_or_default = magic_enum::enum_cast<Color>(value).value_or(Color::NONE);
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Indexed access to enum value
std::size_t i = 0; Color color = magic_enum::enum_value<Color>(i); // color -> Color::RED
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Enum value sequence
constexpr auto colors = magic_enum::enum_values<Color>(); // colors -> {Color::RED, Color::BLUE, Color::GREEN} // colors[0] -> Color::RED
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Number of enum elements
constexpr std::size_t color_count = magic_enum::enum_count<Color>(); // color_count -> 3
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Enum value to integer
Color color = Color::RED; auto color_integer = magic_enum::enum_integer(color); // or magic_enum::enum_underlying(color); // color_integer -> 1
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Enum names sequence
constexpr auto color_names = magic_enum::enum_names<Color>(); // color_names -> {"RED", "BLUE", "GREEN"} // color_names[0] -> "RED"
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Enum entries sequence
constexpr auto color_entries = magic_enum::enum_entries<Color>(); // color_entries -> {{Color::RED, "RED"}, {Color::BLUE, "BLUE"}, {Color::GREEN, "GREEN"}} // color_entries[0].first -> Color::RED // color_entries[0].second -> "RED"
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Enum fusion for multi-level switch/case statements
switch (magic_enum::enum_fuse(color, direction).value()) { case magic_enum::enum_fuse(Color::RED, Directions::Up).value(): // ... case magic_enum::enum_fuse(Color::BLUE, Directions::Down).value(): // ... // ... }
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Enum switch runtime value as constexpr constant
Color color = Color::RED; magic_enum::enum_switch([] (auto val) { constexpr Color c_color = val; // ... }, color);
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Enum iterate for each enum as constexpr constant
magic_enum::enum_for_each<Color>([] (auto val) { constexpr Color c_color = val; // ... });
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Check if enum contains
magic_enum::enum_contains(Color::GREEN); // -> true magic_enum::enum_contains<Color>(2); // -> true magic_enum::enum_contains<Color>(123); // -> false magic_enum::enum_contains<Color>("GREEN"); // -> true magic_enum::enum_contains<Color>("fda"); // -> false
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Enum index in sequence
constexpr auto color_index = magic_enum::enum_index(Color::BLUE); // color_index.value() -> 1 // color_index.has_value() -> true
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Functions for flags
enum Directions : std::uint64_t { Left = 1, Down = 2, Up = 4, Right = 8, }; template <> struct magic_enum::customize::enum_range<Directions> { static constexpr bool is_flags = true; }; magic_enum::enum_flags_name(Directions::Up | Directions::Right); // directions_name -> "Directions::Up|Directions::Right" magic_enum::enum_flags_contains(Directions::Up | Directions::Right); // -> true magic_enum::enum_flags_cast(3); // -> "Directions::Left|Directions::Down"
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Enum type name
Color color = Color::RED; auto type_name = magic_enum::enum_type_name<decltype(color)>(); // type_name -> "Color"
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IOstream operator for enum
using namespace magic_enum::ostream_operators; // out-of-the-box ostream operators for enums. Color color = Color::BLUE; std::cout << color << std::endl; // "BLUE"
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Bitwise operator for enum
enum class Flags { A = 1 << 0, B = 1 << 1, C = 1 << 2, D = 1 << 3 }; using namespace magic_enum::bitwise_operators; // out-of-the-box bitwise operators for enums. // Support operators: ~, |, &, ^, |=, &=, ^=. Flags flags = Flags::A | Flags::B & ~Flags::C;
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Checks whether type is an Unscoped enumeration.
enum color { red, green, blue }; enum class direction { left, right }; magic_enum::is_unscoped_enum<color>::value -> true magic_enum::is_unscoped_enum<direction>::value -> false magic_enum::is_unscoped_enum<int>::value -> false // Helper variable template. magic_enum::is_unscoped_enum_v<color> -> true
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Checks whether type is an Scoped enumeration.
enum color { red, green, blue }; enum class direction { left, right }; magic_enum::is_scoped_enum<color>::value -> false magic_enum::is_scoped_enum<direction>::value -> true magic_enum::is_scoped_enum<int>::value -> false // Helper variable template. magic_enum::is_scoped_enum_v<direction> -> true
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Static storage enum variable to string This version is much lighter on the compile times and is not restricted to the enum_range limitation.
constexpr Color color = Color::BLUE; constexpr auto color_name = magic_enum::enum_name<color>(); // color_name -> "BLUE"
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containers::array
array container for enums.magic_enum::containers::array<Color, RGB> color_rgb_array {}; color_rgb_array[Color::RED] = {255, 0, 0}; color_rgb_array[Color::GREEN] = {0, 255, 0}; color_rgb_array[Color::BLUE] = {0, 0, 255}; magic_enum::containers::get<Color::BLUE>(color_rgb_array) // -> RGB{0, 0, 255}
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containers::bitset
bitset container for enums.constexpr magic_enum::containers::bitset<Color> color_bitset_red_green {Color::RED|Color::GREEN}; bool all = color_bitset_red_green.all(); // all -> false // Color::BLUE is missing bool test = color_bitset_red_green.test(Color::RED); // test -> true
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containers::set
set container for enums.auto color_set = magic_enum::containers::set<Color>(); bool empty = color_set.empty(); // empty -> true color_set.insert(Color::GREEN); color_set.insert(Color::BLUE); color_set.insert(Color::RED); std::size_t size = color_set.size(); // size -> 3
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Improved UB-free "SFINAE-friendly" underlying_type.
magic_enum::underlying_type<color>::type -> int // Helper types. magic_enum::underlying_type_t<Direction> -> int
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magic_enum
does not pretend to be a silver bullet for reflection for enums, it was originally designed for small enum. -
Before use, read the limitations of functionality.
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You should add the required file magic_enum.hpp, and optionally other headers from include dir or release archive. Alternatively, you can build the library with CMake.
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If you are using vcpkg on your project for external dependencies, then you can use the magic-enum package.
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If you are using Conan to manage your dependencies, merely add
magic_enum/x.y.z
to your conan's requires, wherex.y.z
is the release version you want to use. -
If you are using Build2 to build and manage your dependencies, add
depends: magic_enum ^x.y.z
to the manifest file wherex.y.z
is the release version you want to use. You can then import the target usingmagic_enum%lib{magic_enum}
. -
Alternatively, you can use something like CPM which is based on CMake's
Fetch_Content
module.CPMAddPackage( NAME magic_enum GITHUB_REPOSITORY Neargye/magic_enum GIT_TAG x.y.z # Where `x.y.z` is the release version you want to use. )
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Bazel is also supported, simply add to your WORKSPACE file:
http_archive( name = "magic_enum", strip_prefix = "magic_enum-<commit>", urls = ["https://github.com/Neargye/magic_enum/archive/<commit>.zip"], )
To use bazel inside the repository it's possible to do:
bazel build //... bazel test //... bazel run //example
(Note that you must use a supported compiler or specify it with
export CC= <compiler>
.) -
If you are using Ros, you can include this package by adding
<depend>magic_enum</depend>
to your package.xml and include this package in your workspace. In your CMakeLists.txt add the following:find_package(magic_enum CONFIG REQUIRED) ... target_link_libraries(your_executable magic_enum::magic_enum)
- Clang/LLVM >= 5
- MSVC++ >= 14.11 / Visual Studio >= 2017
- Xcode >= 10
- GCC >= 9
- MinGW >= 9