How do I idiomatically convert a bool to an Option or Result in Rust?

Question

It seems there is no way of such one-line conversion using std.

I do not like this kind of verbosity:

match my_bool {
    true => Ok(()),
    false => Err(MyError::False),
}

I would like to use a one-liner, for example:

let my_bool = true;
let my_option = my_bool.to_option(MyObject{}); // true => MyObject{}, false => None
let my_result = my_bool.to_result(MyObject{}, MyError{}); // true => MyObject{}, false => MyError{}

What is the shortest piece of code for doing that?

Answer 1

This answer is somewhat outdated. Starting with Rust 1.50, you can use the built-in bool::then. See the other answers above for more information.

---

There is the boolinator crate. It defines the extension trait Boolinator for bool which adds a couple of useful methods. Example:

use boolinator::Boolinator;

my_bool.as_some(MyObject {});                // Option<MyObject>
my_bool.as_result(MyObject {}, MyError {});  // Result<MyObject, MyError>

A true value leads to Some(_) or Ok(_), while a false value leads to None or Err(_).

There is an issue about adding functionality like this to std on the RFCs repository, but it doesn't look like it's happening anytime soon.