(Also on stackoverflow: rust - Borrowed value does not live long enough when using functions with lifetime specifier - Stack Overflow)
I am fairly unfamiliar with Rust lifetime. Here is the code I wrote:
pub fn from_reader<'de, T, R>(reader: &'de mut R) -> Result<T>
where
T: Deserialize<'de>,
R: Read,
{
let mut reader = BufReader::new(reader);
from_buf_reader(&mut reader)
}
pub fn from_buf_reader<'de, T, R>(reader: &'de mut R) -> Result<T>
where
T: Deserialize<'de>,
R: BufRead,
{
//...
}
I got the following error:
error[E0597]: `reader` does not live long enough
--> src/de.rs:34:21
|
28 | pub fn from_reader<'de, T, R>(reader: &'de mut R) -> Result<T>
| --- lifetime `'de` defined here
...
34 | from_buf_reader(&mut reader)
| ----------------^^^^^^^^^^^-
| | |
| | borrowed value does not live long enough
| argument requires that `reader` is borrowed for `'de`
35 | }
| - `reader` dropped here while still borrowed
From my understanding, the newly created reader
needs to have 'de
lifetime, which is not possible because 'de
begins before this function is even called. Is this the correct interpretation?
Is there a way around this issue without directly taking ownership of the parameter?