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Update Ch15

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This commit is contained in:
Unisko PENG
2023-05-16 17:59:29 +08:00
parent 9841cb66f5
commit d9711768a5
2 changed files with 66 additions and 63 deletions
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38
projects/tree_demo/src/main.rs
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@@ -15,15 +15,37 @@ fn main() {
children: RefCell::new(vec! []),
});
println! ("叶子节点的父节点 = {:?}", leaf.parent.borrow().upgrade());
println! (
"叶子节点的强引用计数：{}，弱引用计数：{}\n",
Rc::strong_count(&leaf),
Rc::weak_count(&leaf),
);
let branch = Rc::new(Node {
value: 5,
parent: RefCell::new(Weak::new()),
children: RefCell::new(vec! [Rc::clone(&leaf)]),
});
{
let branch = Rc::new(Node {
value: 5,
parent: RefCell::new(Weak::new()),
children: RefCell::new(vec! [Rc::clone(&leaf)]),
});
*leaf.parent.borrow_mut() = Rc::downgrade(&branch);
*leaf.parent.borrow_mut() = Rc::downgrade(&branch);
println! ("叶子节点的父节点 = {:?}", leaf.parent.borrow().upgrade());
println! (
"枝干节点的强引用计数：{}，弱引用计数：{}\n",
Rc::strong_count(&branch),
Rc::weak_count(&branch),
);
println! (
"叶子节点的强引用计数：{}，弱引用计数：{}\n",
Rc::strong_count(&leaf),
Rc::weak_count(&leaf),
);
}
println! ("叶子节点的父节点 = {:?}\n", leaf.parent.borrow().upgrade());
println! (
"叶子节点的强引用计数：{}，弱引用计数：{}\n",
Rc::strong_count(&leaf),
Rc::weak_count(&leaf),
);
}