rc

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trait Output {
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    fn output(&self);
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}
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struct Foo {
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    x: i32,
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}
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impl Output for Foo {
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    fn output(&self) {
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        println!("{}", self.x);
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    }
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}
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fn func(v: &mut Vec<Rc<dyn Output>>) {
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    let foo = Foo { x: 1 };
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    let bar = Bar { y: 2.0 };
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    v.push(Rc::new(foo));
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    v.push(Rc::new(bar));
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}