图的Rust中的异构容器

enum Container {
    Int(i32),
    Str(String),
}

fn main() {
    let data = vec![
        Container::Int(42),
        Container::Str(String::from("Hello, world!")),
    ];

    for item in data {
        match item {
            Container::Int(value) => println!("Integer: {}", value),
            Container::Str(value) => println!("String: {}", value),
        }
    }
}

trait Value {
    fn print(&self);
}

struct IntValue(i32);

impl Value for IntValue {
    fn print(&self) {
        println!("Integer: {}", self.0);
    }
}

struct StrValue(String);

impl Value for StrValue {
    fn print(&self) {
        println!("String: {}", self.0);
    }
}

fn main() {
    let data: Vec<Box<dyn Value>> = vec![
        Box::new(IntValue(42)),
        Box::new(StrValue(String::from("Hello, world!"))),
    ];

    for item in data {
        item.print();
    }
}