That was assuming `Vector` implements `Clone`. For example:
#[deriving(Clone)]
struct Vector {
coordinates: Vec<int>
}
On 2014-06-13, at 13:14, Tommi <[email protected]> wrote:
> Taking an argument by "stable value" (as `self` above) means that any
> (clonable) variable passed in as that argument is implicitly cloned before
> it's passed in if the variable is potentially used after been passed in. For
> example:
>
> impl Mul<int, Vector> for Vector {
> fn mul(stable self, rhs: &int) -> Vector {
> for c in self.coordinates.mut_iter() {
> *c *= *rhs;
> }
> self
> }
> }
>
> fn testing() {
> let mut v = Vector { coordinates: vec!(1, 2, 3) };
> v * 1; // Cloned due to not last use
> v * 1; // Not cloned due to last use before assignment
> v = Vector { coordinates: vec!(2, 4, 6) };
> v * 1; // Cloned due to not last use
> v = v * 1; // Not cloned due to last use before assignment
> v * 1; // Not cloned due to last use
> }
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