什么是建造者模式

即将结构体属性方法与构建解离，使用专门的builder进行建造，说白了就是new和其他的方法分开，集中处理更方便。

直接上代码：

#[derive(Debug)]
struct children {
    name: String,
    age: u32,
}

impl children {
    pub fn find_generator() -> Generator {
        Generator::default()
    }
}
#[derive(Default)]
struct Generator {
    name: String,
    age: u32,
    //... and so on...
}

impl Generator {
    pub fn new() -> Generator {
        Generator {
            name: String::from("generator"),
            age: 11,
            //... and so on...
        }
    }
    pub fn buildchildren(self) -> children {
        children {
            name: self.name,
            age: self.age,
            //... and so on...
        }
    }
}

fn main() {
    let child_from_generator = Generator::new().buildchildren();
    println!("{:?}", child_from_generator);
}