On 2013-11-22, at 7:42, Patrick Walton <[email protected]> wrote:
>
> I think it's unlikely that the performance hit there would be significant.
> Actually, the example you gave, there won't be any at all because it'll be
> devirtualized and inlined.
Oh, okay, that's good to hear.
>
> There is `move_iter`, but that only works for owned vectors. Perhaps what you
> want is a kind of iterator that clones its values...
>
I suppose what .map(|a| a.clone()) does would be a generalization of that.
Although I don't know what that does exactly.
Now, off-topic: I've been trying to post the following question to this mailing
list for like 4 times, but no dice. I seem to have better luck when replying to
posts, so here it goes:
struct Value {
n: int
}
impl Value {
fn squared(mut self) -> Value {
self.n *= self.n;
self
}
}
fn main() {
let x = Value{ n: 3 };
let y = x.squared();
println!("{} {}", x.n, y.n); // prints 9 9
}
self isn't being passed by value to squared, since x.n gets mutated as well.
This must be a bug, right?
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