Questions tagged «borrow-checker»

我有一个值，我想以自己的类型存储该值和对该值中内容的引用： struct Thing { count: u32, } struct Combined<'a>(Thing, &'a u32); fn make_combined<'a>() -> Combined<'a> { let thing = Thing { count: 42 }; Combined(thing, &thing.count) } 有时，我有一个值，并且想在同一结构中存储该值和对该值的引用： struct Combined<'a>(Thing, &'a Thing); fn make_combined<'a>() -> Combined<'a> { let thing = Thing::new(); Combined(thing, &thing) } 有时，我什至没有引用该值，并且得到了相同的错误： struct Combined<'a>(Parent, Child<'a>); fn make_combined<'a>() …

222 lifetime  borrow-checker  rust 

我不明白这个错误cannot move out of borrowed content。我已经收到了很多次，并且我一直都解决了它，但是我从来不明白为什么。 例如： for line in self.xslg_file.iter() { self.buffer.clear(); for current_char in line.into_bytes().iter() { self.buffer.push(*current_char as char); } println!("{}", line); } 产生错误： error[E0507]: cannot move out of borrowed content --> src/main.rs:31:33 | 31 | for current_char in line.into_bytes().iter() { | ^^^^ cannot move out of borrowed …

127 reference  rust  move-semantics  borrow-checker 

在这种情况下，错误是什么意思： fn main() { let mut v: Vec<usize> = vec![1, 2, 3, 4, 5]; v[v[1]] = 999; } error[E0502]: cannot borrow `v` as immutable because it is also borrowed as mutable --> src/main.rs:3:7 | 3 | v[v[1]] = 999; | --^---- | | | | | immutable borrow occurs here …

16 rust  borrow-checker