An enum in Rust is a type that represents data that is one of several possible variants. Enums can be useful for representing a set of possible values that are mutually exclusive. For example, the `IpAddrKind` enum is useful for representing the different types of IP addresses that exist. Here is an example of an enum:
enum Color {
Red,
Green,
Blue,
}
This enum defines three possible variants: `Red`, `Green`, and `Blue`. This means that a `Color` value can only be one of these three colors. Enums can be used to represent a wide variety of different data. Some common uses for enums include:
- Representing a set of possible values that are mutually exclusive.
- Representing a set of possible states that an object can be in.
- Representing a set of possible errors that can occur.
