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Description

Header-only C++17 library provides static reflection for enums, work with any enum type without any macro or boilerplate code.

Programming language: C++
License: MIT License
Tags: Serialization     Meta Programming     C++17     Cpp17     Cpp     Reflection    
Latest version: v0.9.8

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Github releases Conan package Vcpkg package Build2 package [License](LICENSE) Try online Compiler explorer

Magic Enum C++

Header-only C++17 library provides static reflection for enums, work with any enum type without any macro or boilerplate code.

  • enum_cast obtains enum value from string or integer.
  • enum_value returns enum value at specified index.
  • enum_values obtains enum value sequence.
  • enum_count returns number of enum values.
  • enum_integer obtains integer value from enum value.
  • enum_name returns name from enum value.
  • enum_names obtains string enum name sequence.
  • enum_entries obtains pair (value enum, string enum name) sequence.
  • enum_index obtains index in enum value sequence from enum value.
  • enum_contains checks whether enum contains enumerator with such value.
  • enum_type_name returns name of enum type.
  • enum_fuse allows multidimensional switch/cases.
  • enum_switch allows runtime enum value transformation to constexpr context.
  • enum_for_each calls a function with all enum constexpr value.
  • is_unscoped_enum checks whether type is an Unscoped enumeration.
  • is_scoped_enum checks whether type is an Scoped enumeration.
  • underlying_type improved UB-free "SFINAE-friendly" underlying_type.
  • ostream_operators ostream operators for enums.
  • bitwise_operators bitwise operators for enums.

Documentation

  • [Reference](doc/reference.md)
  • [Limitations](doc/limitations.md)
  • Integration

Features

  • C++17
  • Header-only
  • Dependency-free
  • Compile-time
  • Enum to string
  • String to enum
  • Iterating over enum

[Examples](example/example.cpp)

  • Enum value to string
  Color color = Color::RED;
  auto color_name = magic_enum::enum_name(color);
  // color_name -> "RED"
  • 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
  }

  auto color_or_default = magic_enum::enum_cast<Color>(value).value_or(Color::NONE);
  • 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);
  • Indexed access to enum value
  std::size_t i = 0;
  Color color = magic_enum::enum_value<Color>(i);
  // color -> Color::RED
  • Enum value sequence
  constexpr auto colors = magic_enum::enum_values<Color>();
  // colors -> {Color::RED, Color::BLUE, Color::GREEN}
  // colors[0] -> Color::RED
  • Number of enum elements
  constexpr std::size_t color_count = magic_enum::enum_count<Color>();
  // color_count -> 3
  • Enum value to integer
  Color color = Color::RED;
  auto color_integer = magic_enum::enum_integer(color);
  // color -> 1
  • Enum names sequence
  constexpr auto color_names = magic_enum::enum_names<Color>();
  // color_names -> {"RED", "BLUE", "GREEN"}
  // color_names[0] -> "RED"
  • 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"
  • 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(): // ...
  // ...
  }

  • Enum switch runtime value as constexpr constant

    Color color = Color::RED;
magic_enum::enum_switch([] (auto val) {
constexpr Color c_color = val;
// ...
}, color);

  • Enum iterate for each enum as constexpr constant

    magic_enum::enum_for_each<Color>([] (auto val) {
constexpr Color c_color = val;
// ...
});

  • Ostream 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"
  • 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;

  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

  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
  • Static storage enum variable to string This version is much lighter on the compile times and is not restricted to the enum_range [limitation](doc/limitations.md).
  constexpr Color color = Color::BLUE;
  constexpr auto color_name = magic_enum::enum_name<color>();
  // color_name -> "BLUE"

Remarks

  • 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](doc/limitations.md) of functionality.

Integration

  • You should add the required file [magic_enum.hpp](include/magic_enum.hpp).

  • If you are using vcpkg on your project for external dependencies, then you can use the magic-enum package.

  • If you are using Conan to manage your dependencies, merely add magic_enum/x.y.z to your conan's requires, where x.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 where x.y.z is the release version you want to use. You can then import the target using magic_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.
  )
  • 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: cmake find_package(magic_enum CONFIG REQUIRED) ... target_link_libraries(your_executable magic_enum::magic_enum)

Compiler compatibility

  • Clang/LLVM >= 6
  • MSVC++ >= 14.11 / Visual Studio >= 2017
  • Xcode >= 10
  • GCC >= 9
  • MinGW >= 9

Licensed under the [MIT License](LICENSE)


*Note that all licence references and agreements mentioned in the Magic Enum C++ README section above are relevant to that project's source code only.