Avoid unnamed enumerations

Reason

If you can't name an enumeration, the values are not related

Example, bad

enum { red = 0xFF0000, scale = 4, is_signed = 1 };

Such code is not uncommon in code written before there were convenient alternative ways of specifying integer constants.

Alternative

Use constexpr values instead. For example:

constexpr int red = 0xFF0000;
constexpr short scale = 4;
constexpr bool is_signed = true;

Enforcement

Flag unnamed enumerations.