builder

To date I use the following implementation of the builder pattern (as opposed to the implementation described here ): public class Widget { public static class Builder { public Builder(String name, double price) { ... } public Widget build() { ... } public Builder manufacturer(String value) { ... } public Builder serialNumber(String value) { ... } public Builder model(String value) { ... } } private Widget(Builder builder) { ... } } This works well for most situations I've encountered where I need to build up a complex object with a variety of required/mandatory and optional parameters.

I have the following code: pub struct Canvas<'a> { width: isize, height: isize, color: Color, surface: Surface, texture: Texture, renderer: &'a Renderer, } impl<'a> Canvas<'a> { pub fn new(width: isize, height: isize, renderer: &'a Renderer) -> Canvas<'a> { let color = Color::RGB(0, 30, 0); let mut surface = core::create_surface(width, height); let texture = Canvas::gen_texture(&mut surface, width, height, color, renderer); Canvas { width: width, height: height, color: color, surface: surface, texture: texture, renderer: renderer, } } pub fn color(&mut self, color: Color) -> &mut Canvas<'a> {