dehqan / nameof

Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum

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| |\  | (_| | | | | | |  __/ (_) | |   | |____|_|   |_|
|_| \_|\__,_|_| |_| |_|\___|\___/|_|    \_____|

Nameof C++

Header-only C++17 library provides nameof macros and functions to simply obtain the name of a variable, type, function, macro, and enum.

Features

• C++17
• Header-only
• Dependency-free
• Compile-time
• Name of variable, member variable
• Name of type, variable type
• Name of function, member function
• Name of enum, enum variable
• Name of macro
• Enum to string

Documentation

• Reference
• Limitations
• Integration

Examples

• Nameof

  // Name of variable.
  NAMEOF(somevar) -> "somevar"
  
  // Name of member variable.
  NAMEOF(person.address.zip_code) -> "zip_code"
  
  // Name of function.
  NAMEOF(foo<int, float>()) -> "foo"
  
  // Name of member function.
  NAMEOF(somevar.some_method()) -> "some_method"
  NAMEOF(somevar.some_method<int>()) -> "some_method"
  
  // Name of macro.
  NAMEOF(__LINE__) -> "__LINE__"
  NAMEOF(NAMEOF(structvar)) -> "NAMEOF"

• Nameof enum

  enum class Color { RED = 1, BLUE = 2, GREEN = 4 };
  
  auto color = Color::RED;
  // Name of enum variable.
  NAMEOF_ENUM(color) -> "RED"
  nameof::nameof_enum(color) -> "RED"
  
  // Static storage enum variable to string.
  // This version is much lighter on the compile times and is not restricted to the enum_range limitation.
  NAMEOF_CONST_ENUM(Color::GREEN) -> "GREEN"
  nameof::nameof_enum<Color::GREEN>() -> "GREEN"
  
  // Enum flag variable to string.
  NAMEOF_ENUM_FLAG(Color::GREEN | Color::BLUE) -> "GREEN|BLUE"
  nameof::nameof_enum_flag<Color::GREEN>() -> "GREEN|BLUE"

• Nameof type

  using T = const int&;
  T var = 42;
  // Name of variable type.
  NAMEOF_TYPE_EXPR(var) -> "int"
  NAMEOF_FULL_TYPE_EXPR(var) -> "const int&"
  nameof::nameof_type<decltype(var)>() -> "int"
  nameof::nameof_full_type<decltype(var)>() -> "const int&"
  
  // Name of type.
  NAMEOF_TYPE(T) -> "int"
  NAMEOF_FULL_TYPE(T) -> "const int&"
  nameof::nameof_type<T>() -> "int"
  nameof::nameof_full_type<T>() -> "const int&"

• Compile-time

  constexpr auto somevar_name = NAMEOF(somevar);
  // somevar_name -> "somevar"
  constexpr auto color_name = NAMEOF_ENUM(Color::BLUE); // or nameof::nameof_enum(Color::BLUE)
  // color_name -> "BLUE"
  constexpr auto var_type_name = NAMEOF_TYPE_EXPR(var); // or nameof::nameof_type<decltype(var)>()
  // var_type_name -> "int"
  constexpr auto type_name = NAMEOF_TYPE(T); // or nameof::nameof_type<T>()
  // type_name -> "int"

Remarks

• Before use, read the limitations of functionality.

Integration

You should add required file nameof.hpp.

If you are using vcpkg on your project for external dependencies, then you can use the nameof package.

If you are using Conan to manage your dependencies, merely add nameof/x.y.z to your conan's requires, where x.y.z is the release version you want to use.

Alternatively, you can use something like CPM which is based on CMake's Fetch_Content module.

CPMAddPackage(
    NAME nameof
    GITHUB_REPOSITORY Neargye/nameof
    GIT_TAG x.y.z # Where `x.y.z` is the release version you want to use.
)

Compiler compatibility

• Clang/LLVM >= 5
• MSVC++ >= 14.11 / Visual Studio >= 2017
• Xcode >= 10
• GCC >= 7 (GCC >= 9 for NAMEOF_ENUM)

Licensed under the MIT License