| 语法 | 等价于 | 访问级别 |
|---|---|---|
for item in collection |
for item in IntoIterator::into_iter(collection) |
拥有所有权,也就是for语句结束之后，collection已经无效 |
for item in &collection |
for item in collection.iter() |
只读，语句结束，collection有效 |
for item in &mut collection |
for item in collection.iter_mut() |
读写，语句结束，collection有效 |