[−]Keyword loop
Loop indefinitely.
loop
is used to define the simplest kind of loop supported in Rust. It runs the code inside
it until the code uses break
or the program exits.
loop { println!("hello world forever!"); } let mut i = 0; loop { println!("i is {}", i); if i > 10 { break; } i += 1; }Run
Unlike the other kinds of loops in Rust (while
, while let
, and for
), loops can be used as
expressions that return values via break
.
let mut i = 1; let something = loop { i *= 2; if i > 100 { break i; } }; assert_eq!(something, 128);Run
Every break
in a loop has to have the same type. When it's not explicitly giving something,
break;
returns ()
.
For more information on loop
and loops in general, see the Reference.