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How do I idiomatically convert a bool to an Option or Result in Rust?
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Problem
It seems there is no way of such one-line conversion using
I do not like this kind of verbosity:
I would like to use a one-liner, for example:
What is the shortest piece of code for doing that?
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?
Solution
This answer is somewhat outdated. Starting with Rust 1.50, you can use the built-in
There is the
A
There is an issue about adding functionality like this to
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
my_bool.as_result(MyObject {}, MyError {}); // ResultA
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.Code Snippets
use boolinator::Boolinator;
my_bool.as_some(MyObject {}); // Option<MyObject>
my_bool.as_result(MyObject {}, MyError {}); // Result<MyObject, MyError>Context
Stack Overflow Q#54841351, score: 20
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