79 lines
1.8 KiB
Rust
Executable file
79 lines
1.8 KiB
Rust
Executable file
// struct
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// snowy eastern oO
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// main function
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fn main() {
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// creating complex data type
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let origin_x = 0;
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let origin_y = 0;
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let origin = Point { x: 0, y: 0 }; // origin: Point
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println!("The origin is at ({}, {})", origin.x, origin.y);
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let mut point = Point { x: 0, y: 0 };
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point.x = 5; // excess field by name
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println!("The point is at ({}, {})", point.x, point.y);
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{
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let r = PointRef { x: &mut point.x, y: &mut point.y };
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*r.x = 5;
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*r.y = 6;
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}
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assert_eq!(5, point.x); // 'assert_eq' -> assert two expression are equal
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assert_eq!(6, point.y);
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let mut point3d = Point3d { x: 0, y: 0, z: 0 };
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// point3d = { x: 1, .. point3d }; // gives point a new y, but keeps x and z // doesn't work anymore
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// making new point
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// let point_new = Point3d { z: 1, x: 2, .. origin };
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// assigning color black (tuple struct)
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let black = Color(0, 0, 0); // not the same type as 'let origin = Point(0, 0, 0)'
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let origin = Point2(0, 0, 0);
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// tuple struct with only one element -> 'newtype'
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let length = Inches(10);
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let Inches(inter_length) = length; // extract inner integer typ
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let inter_length2 = length.0; // does the same as aboves
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println!("length is {} inches", inter_length);
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}
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// combine two single data types into one
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struct Point { // struct for creatiting 2D point
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x: i32, // could use 'let' here
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y: i32,
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}
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// structure with reference pointer
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struct PointRef<'a> {
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x: &'a mut i32,
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y: &'a mut i32,
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}
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// structure for 3D points
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struct Point3d {
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x: i32,
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y: i32,
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z: i32,
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}
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// tuple struct
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//struct Color(i32, i32, i32);
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struct Point2(i32, i32, i32);
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struct Inches(i32);
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// struct -> clearer
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struct Color {
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red: i32, // actually names instead positions
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blue: i32,
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green: i32,
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}
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