Hi,
I am trying to get the following example to work. What I find strange
is, that
I can call vec::push in fn main(), but when I do the same from fn
pushit(), it fails
with:
t.rs:6:17: 6:24 error: illegal borrow unless pure: unique value in
aliasable, mutable location
t.rs:6 vec::push(&mut a.arr[0], 3);
^~~~~~~
t.rs:6:2: 6:11 note: impure due to access to impure function
t.rs:6 vec::push(&mut a.arr[0], 3);
^~~~~~~~~
Example:
struct A {
arr: ~[ ~[int] ]
}
fn pushit(a: &mut A) /*unsafe*/ {
vec::push(&mut a.arr[0], 3);
}
fn main() {
let mut a: A = A {arr: ~[ ~[1,2,3], ~[3,4,5] ] };
vec::push(&mut a.arr[0], 3); // WORKS
pushit(&mut a); // DOES NOT work!!!
error!("%?", a);
}
I am a bit lost here. When I use "unsafe" it works, but is it safe???
Best,
Michael
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