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Updated enums.md in the book
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bors 2015-12-10 03:09:27 +00:00
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src/doc/book/enums.md
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@ -1,7 +1,8 @@
% Enums
An `enum` in Rust is a type that represents data that could be one of
several possible variants:
An `enum` in Rust is a type that represents data that is one of
several possible variants. Each variant in the `enum` can optionally
have data associated with it:
```rust
enum Message {
@ -12,9 +13,8 @@ enum Message {
}
```
Each variant can optionally have data associated with it. The syntax for
defining variants resembles the syntaxes used to define structs: you can
have variants with no data (like unit-like structs), variants with named
The syntax for defining variants resembles the syntaxes used to define structs:
you can have variants with no data (like unit-like structs), variants with named
data, and variants with unnamed data (like tuple structs). Unlike
separate struct definitions, however, an `enum` is a single type. A
value of the enum can match any of the variants. For this reason, an
@ -41,7 +41,7 @@ let y: BoardGameTurn = BoardGameTurn::Move { squares: 1 };
Both variants are named `Move`, but since they’re scoped to the name of
the enum, they can both be used without conflict.
A value of an enum type contains information about which variant it is,
A value of an `enum` type contains information about which variant it is,
in addition to any data associated with that variant. This is sometimes
referred to as a ‘tagged union’, since the data includes a ‘tag’
indicating what type it is. The compiler uses this information to
@ -67,7 +67,7 @@ equality yet, but we’ll find out in the [`traits`][traits] section.
# Constructors as functions
An enum’s constructors can also be used like functions. For example:
An `enum` constructor can also be used like a function. For example:
```rust
# enum Message {
@ -76,7 +76,7 @@ An enum’s constructors can also be used like functions. For example:
let m = Message::Write("Hello, world".to_string());
```
Is the same as
is the same as
```rust
# enum Message {