Empowered Enum

eenum is a utility macro that automatically builds metadata for an enum definition.

This library requires C++20.

A nix development environment is defined to easily run unit tests:

$ nix develop
$ build

With meson, ninja and a C++20 capable compiler it is also possible to:

$ meson build
$ ninja -C build test

To use the library it is enough to include both the hpp files in src/ folder.

eenum definition

To define an empowered enum, the macro eenum must be called.

Its signatures is:

eenum(name, underlying type, values ...)

For example:

eenum(test, unsigned, TEST1 = 5, TEST2, TEST3 = 42)

Will define an enum called test that inherits from unsigned. It is equivalent to:

enum class test: unsigned
{
    TEST1 = 5,
    TEST2
    TEST3 = 42
};

The generated eenum can be used just like a normal enum class:

test t = test::TEST1;

switch(t)
{
    case (test::TEST1): ...
    case (test::TEST2): ...
} // compiler warning: TEST3 unhandled

And it will be able to:

t = "TEST2"; //equivalent to t = test::TEST2

std::string t_string = t; //"TEST1"
t_string = t.to_string()l //"TEST1"

Casts to and from strings are constexpr, but at runtime will cost respectively O(log(n)) and O(n), where n is the number of values.