I have the following simplified code:
fn f() -> i32 {
let a = some_result.unwrap_or_else(|_| {
return 1; // want to return this value from f <-------------
});
}
I want to return the value 1
from the whole function f
in this specific error case but I can't figure out how to do it from within a closure.
If I instead use a match
expression, it works fine as follows:
fn f() -> i32 {
let a = match some_result {
Ok(result) => result,
Err(_) => { return 1; },
};
}
However, this makes the code verbose since I have the trivial Ok
match arm.
No, there is not.
A closure is a method (a kind of function) under the hood. You are asking for the ability to exit a parent function from an arbitrarily deeply nested function call. Such non-local flow control has generally proven to be extremely bad for programmer sanity and program maintenance.
To solve your problem: