Hi all,
I posted this question on [Stack Overflow][1], but it is yet to be
answered there, so I ask here too.
Why reference to traits are not cloneable? The following code compiles:
struct Test;
fn clone_vec<'a>(v: Vec<&'a Test>) -> Vec<&'a Test> {
v.clone()
}
But this one doesn't:
trait Test {
fn do_smt(&self);
}
fn clone_vec<'a>(v: Vec<&'a Test>) -> Vec<&'a Test> {
v.clone()
}
It spits this error:
main3.rs:7:5: 7:14 error: failed to find an implementation of trait
std::clone::Clone for &'a Test<no-bounds>
main3.rs:7 v.clone()
^~~~~~~~~
However, Clone trait is implemented for all kinds of references, as
far as I can see. I just don't see why &'a Test where Test is a trait
is not cloneable.
This is very strange provided that I can implement clone_vec() myself,
without using Clone:
fn clone_vec<'a>(v: Vec<&'a Test>) -> Vec<&'a Test> {
let mut result = Vec::new();
for &e in v.iter() {
result.push(e);
}
result
}
It works just fine.
If this is a bug, I would gladly submit it to the tracker, but I'm not
sure that I'm not doing something wrong.
[1]:
http://stackoverflow.com/questions/23426545/references-to-trait-objects-are-not-cloneable
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