Modern C++ Programming Cookbook

Using scoped enumerations

Enumeration is a basic type in C++ that defines a collection of values, always of an integral underlying type. Their named values, that are constant, are called enumerators. Enumerations declared with keyword enum are called unscoped enumerations and enumerations declared with enum class or enum struct are called scoped enumerations. The latter ones were introduced in C++11 and are intended to solve several problems of the unscoped enumerations.