C++ does not have any reflection for enums, which makes it harder to maintain code.

EIE provides an interface for keeping track of an enum class's constant count and easy validity checks. Please note that EIE only works as intended for enums that have continuous values, starting at 0. EIE works at compile time and is ultra lightweight, so no overhead is created when using EIE. However, this also means that no string tables for string conversion are created, so the feature set is kept very simple.

git clone https://github.com/RmbRT/cppeie

EIE is released under the GNU Affero Genereral Public License, version 3 or newer. A copy of the license file can be found in LICENSE.

In an enum class, simply wrap EIE() around the last value in the enum. This will register the enum's size and enable more sophisticated enum access.

Example:

enum class Hobbies
{
	Programming,
    EIE(Eating)
};

By calling eie::count<Enum>(), the number of Enum's constants is retrieved.

int table[eie::count<Hobbies>()];

By calling eie::valid(), it can be determined whether an enum value is valid.

Hobbies hobby = unreliable_value();
assert(eie::valid(hobby));

The eie::Range<Enum> type can be used to easily loop through all of an enum's values.

for(Hobbies hobby: eie::Range<Hobbies>())
	sophisticated(hobby);