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84 lines
1.9 KiB
Rust
84 lines
1.9 KiB
Rust
// ./src/custom_types/structs.md
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// An attribute to hide warnings for unused code.
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#![allow(dead_code)]
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#[derive(Debug)]
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struct Person {
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name: String,
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age: u8,
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}
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// A unit struct
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struct Unit;
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// A tuple struct
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struct Pair(i32, f32);
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// A struct with two fields
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struct Point {
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x: f32,
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y: f32,
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}
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// Structs can be reused as fields of another struct
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struct Rectangle {
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// A rectangle can be specified by where the top left and bottom right
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// corners are in space.
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top_left: Point,
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bottom_right: Point,
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}
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fn part0() {
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// Create struct with field init shorthand
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let name = String::from("Peter");
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let age = 27;
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let peter = Person { name, age };
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// Print debug struct
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println!("{:?}", peter);
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// Instantiate a `Point`
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let point: Point = Point { x: 10.3, y: 0.4 };
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// Access the fields of the point
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println!("point coordinates: ({}, {})", point.x, point.y);
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// Make a new point by using struct update syntax to use the fields of our
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// other one
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let bottom_right = Point { x: 5.2, ..point };
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// `bottom_right.y` will be the same as `point.y` because we used that field
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// from `point`
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println!("second point: ({}, {})", bottom_right.x, bottom_right.y);
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// Destructure the point using a `let` binding
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let Point { x: left_edge, y: top_edge } = point;
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let _rectangle = Rectangle {
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// struct instantiation is an expression too
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top_left: Point { x: left_edge, y: top_edge },
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bottom_right: bottom_right,
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};
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// Instantiate a unit struct
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let _unit = Unit;
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// Instantiate a tuple struct
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let pair = Pair(1, 0.1);
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// Access the fields of a tuple struct
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println!("pair contains {:?} and {:?}", pair.0, pair.1);
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// Destructure a tuple struct
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let Pair(integer, decimal) = pair;
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println!("pair contains {:?} and {:?}", integer, decimal);
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}
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pub fn main() {
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part0();
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}
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