【Rust日报】2022-05-30 精简 builder 模式

gensmusic 发表于 2022-05-30 20:02

Builder Lite: 精简 builder 模式

本文介绍了 builder 模式的一个表亲: 精简 builder 模式.

示例代码如下.

pub struct Shape {
  position: Vec3,
  geometry: Geometry,
  material: Option<Material>,
}

impl Shape {
  pub fn new(geometry: Geometry) -> Shape {
    Shape {
      position: Vec3::default(),
      geometry,
      material: None,
    }
  }

  pub fn with_position(mut self, position: Vec3) -> Shape {
    self.position = position;
    self
  }

  pub fn with_material(mut self, material: Material) -> Shape {
    self.material = Some(material);
    self
  }
}
// 调用示例
let shape = Shape::new(Geometry::Sphere::with_radius(1))
  .with_position(Vec3(0, 9, 2))
  .with_material(Material::SolidColor(Color::Red));

原文链接