as_base

该软件包允许直接访问类似于C++公共基类的特质对象的字段。不涉及虚函数调度，基对象总是从与封装对象相同的地址开始。

use as_base::*;

struct BaseType {
    x: u64,
}

trait MyTrait: AsBase<BaseType> {}

#[derive(AsBase)]
#[repr(C)]
struct Implementor {
    pub base: BaseType,
}

impl MyTrait for Implementor {}

fn main() {
    let x = Implementor {
        base: BaseType { x: 42 },
    };
    let dyn_reference = &x as &dyn MyTrait;
    assert_eq!(dyn_reference.as_base().x, 42)
}