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Update Ch15

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This commit is contained in:
Peng Hailin,
2023-05-13 08:35:49 +08:00
parent 2939005482
commit a8b28d757d
2 changed files with 19 additions and 10 deletions
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16
projects/ref_cycle_demo/src/main.rs
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@@ -18,14 +18,24 @@ impl List {
}
fn main() {
let a = Rc::new(Cons(5, RefCell::new(Rc::new(Nil))));
let a = Rc::new(
Cons(
5,
RefCell::new(Rc::new(Nil))
)
);
println! ("a 的初始 rc 计数 = {}", Rc::strong_count(&a));
println! ("a 的下一条目 = {:?}", a.tail());
let b = Rc::new(Cons(10, RefCell::new(Rc::clone(&a))));
let b = Rc::new(
Cons(
10,
RefCell::new(Rc::clone(&a))
)
);
println! ("b 的创建后 a 的 rc 计数 = {}", Rc::strong_count(&a));
println! ("创建 b 后 a 的 rc 计数 = {}", Rc::strong_count(&a));
println! ("b 的初始 rc 计数 = {}", Rc::strong_count(&b));
println! ("b 的下一条目 = {:?}", b.tail());