I am trying to pass a new LineWriter into a statement from a struct to replace the current writer. In my main code chunk, I have this statement:
if let Some(ref mut tmp_writer) = self.the_writer {
tmp_writer.write_all(/*...*/).unwrap();
}
I want to create a separate writer in a struct that can be returned to be used instead of the above tmp_writer. When calling it in a struct within my code I state:
use std::io::LineWriter;
use std::fs::File;
pub struct Test {
final_writer: Option<LineWriter<File>>,
}
impl Test {
pub fn new() -> Self {
Test { final_writer: None }
}
pub fn return_writer(&mut self) -> LineWriter<File> {
let fin_writer = self.final_writer.unwrap();
return fin_writer;
}
}
fn main() {}
When compiling, I get an error stating
error[E0507]: cannot move out of borrowed content
--> src/main.rs:14:26
|
14 | let fin_writer = self.final_writer.unwrap();
| ^^^^ cannot move out of borrowed content
How should I refactor my code so I can return a LineWriter<File> and not a &LineWriter<File>? If I do return it as a reference, how can I de-reference the writer without having another borrowed content issue?
Correct answer is:
pub fn return_writer(&mut self) -> LineWriter<File> {
return self.final_writer.take().unwrap();
}
