resume

Runs a coroutine until its next yield or its end, and gives the yielded or returned value.

resume h with v also sends v, which becomes the value of the yield expression the coroutine is suspended at. Resuming a finished coroutine panics; check with done(h).

gen fn steps() {
    yield 10;
    yield 20;
    return 30;
}

fn main() {
    let h = steps();
    let a = resume h; // 10
    let b = resume h; // 20
    let c = resume h; // 30
}

See also#

• fn: Declares a function, a method, or (written in an expression) an anonymous function.
• let: Declares a mutable local variable.
• const: Declares a binding that cannot be reassigned: a local, a module constant, or a class field that is set only by new.
• static: Declares a module-level or class-level slot shared by the whole program, or a method without self.
• readonly: A read-only view of a value: nothing reachable through it can be changed.
• if: Runs a block when a bool condition is true.
• else: Introduces the branch of an if that runs when its condition is false (or its pattern does not match).
• while: Repeats a block while a bool condition is true.