Structs

Structs allow you to create custom data types by grouping related values together.

!!! warning "Work in Progress" Structs are partially implemented. You can define and initialize them, but member access (e.g., p.x) is currently under development.

Definition

Structs are defined using the type keyword followed by a name, an equals sign, and a block of fields. Each field has a name and a type, followed by a semicolon.

type Point = {
    x: i32;
    y: i32;
};

type Color = {
    r: u8;
    g: u8;
    b: u8;
    a: u8;
};

Initialization

You can initialize a struct using the StructName::{ field: value, ... } syntax.

fn main(): void {
    const p: Point = Point::{ x: 10, y: 20 };
    
    const transparent_red: Color = Color::{ 
        r: 255u8, 
        g: 0u8, 
        b: 0u8, 
        a: 128u8 
    };
}

Type Aliasing and Nominal Typing

Stride supports creating new types based on existing ones. When you alias a struct type, it creates a nominal type, meaning it is treated as a distinct type by the compiler.

type Vector2d = Point;

fn main(): void {
    const p1: Point = Point::{ x: 5, y: 10 };
    const v1: Vector2d = Vector2d::{ x: 5, y: 10 };
    
    // The following would result in a type error:
    // const p2: Point = v1;
}