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[refs]

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branches/beta/mk/docs.mk

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endif
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docs: $(DOC_TARGETS)
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doc: docs
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compiler-docs: $(COMPILER_DOC_TARGETS)
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trpl: doc/book/index.html

branches/beta/src/doc/trpl/structs.md

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% Structs
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Structs are a way of creating more complex data types. For example, if we were
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`struct`s are a way of creating more complex data types. For example, if we were
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doing calculations involving coordinates in 2D space, we would need both an `x`
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and a `y` value:
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let origin_y = 0;
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```
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A struct lets us combine these two into a single, unified datatype:
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A `struct` lets us combine these two into a single, unified datatype:
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```rust
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struct Point {
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the `struct` keyword, and then with a name. By convention, `struct`s begin with
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a capital letter and are camel cased: `PointInSpace`, not `Point_In_Space`.
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We can create an instance of our struct via `let`, as usual, but we use a `key:
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We can create an instance of our `struct` via `let`, as usual, but we use a `key:
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value` style syntax to set each field. The order doesn’t need to be the same as
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in the original declaration.
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Finally, because fields have names, we can access the field through dot
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notation: `origin.x`.
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The values in structs are immutable by default, like other bindings in Rust.
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The values in `struct`s are immutable by default, like other bindings in Rust.
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Use `mut` to make them mutable:
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```rust
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# Update syntax
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A `struct` can include `..` to indicate that you want to use a copy of some
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other struct for some of the values. For example:
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other `struct` for some of the values. For example:
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```rust
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struct Point3d {
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# Tuple structs
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Rust has another data type that’s like a hybrid between a [tuple][tuple] and a
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struct, called a ‘tuple struct’. Tuple structs have a name, but
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`struct`, called a ‘tuple struct’. Tuple structs have a name, but
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their fields don’t:
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```rust
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let origin = Point(0, 0, 0);
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```
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It is almost always better to use a struct than a tuple struct. We would write
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It is almost always better to use a `struct` than a tuple struct. We would write
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`Color` and `Point` like this instead:
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```rust
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```
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Now, we have actual names, rather than positions. Good names are important,
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and with a struct, we have actual names.
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and with a `struct`, we have actual names.
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There _is_ one case when a tuple struct is very useful, though, and that’s a
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tuple struct with only one element. We call this the ‘newtype’ pattern, because
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# Unit-like structs
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You can define a struct with no members at all:
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You can define a `struct` with no members at all:
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```rust
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struct Electron;
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```
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Such a struct is called ‘unit-like’ because it resembles the empty
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Such a `struct` is called ‘unit-like’ because it resembles the empty
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tuple, `()`, sometimes called ‘unit’. Like a tuple struct, it defines a
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new type.
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useful. For instance, a library may ask you to create a structure that
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implements a certain [trait][trait] to handle events. If you don’t have
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any data you need to store in the structure, you can just create a
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unit-like struct.
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unit-like `struct`.
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[trait]: traits.html

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