The view method provides an *immutable view*, which is why you're
getting a compilation error. I suggest the function
`vec::mut_view()`---unfortunately it does not appear to be offered as a
method at the moment. We're still much too inconsistent about that, but
methods are the future. So just change `let part1 = v.view(0, 5)` to
`let part1 = vec::mut_view(v, 0, 5)` and you should be able to modify
`part1[2]`.
The `vec::slice()` function copies data out and results in a new, unique
array, so changes to the result of `vec::slice()` will not affect the
original. However, the current `slice()` is deprecated and the plan is
to rename what is now `view()` to `slice()` once `slice()` is removed
(see issue #3869 [1]). Sorry for the confusion, pardon our dust and all
that. (The current `slice()` function predates the existence of what we
now call slices)
You cannot send slices (that is, the result of view()) over a channel.
A slice is a borrowed vector---and you can never send borrowed content
over channels, only owned content. You can invoke `slice.to_vec()` to
copy out the data from the slice into a fresh, owned vector, and then
send that.
Hopefully that helps!
regards,
Niko
[1] https://github.com/mozilla/rust/issues/3869
Paul Harvey wrote:
Hi,
So, i am trying to get my head around slices in Rust, specifically how
being unique affects them.
In C i can do the following, and when i am done fiddling, the values
are in the struct.
struct foo{
int a[100];
int b[100];
}
struct foo f;
int dumb_a =&f.a;
int dumb_b =&f.b;
fiddle(dumb_a);
fiddle(dumb_b);
I am trying to figure out if this is possible in Rust with unique types:
fn main(){
let mut v = ~[1,1,1,1,1,2,2,2,2,2,3,3,3,3,3,];
let mut part1 = v.view(0,5);
let mut part2 = vec::slice(v, 6 , 10);
let mut count = 0;
for 5.times{
io::println(fmt!("%?", part1[count]));
count = count + 1;
}
part1[2] = 3;
}
This code is giving me an error, and i am not sure how to devlace a
unique vector with mutable content.
Now apart from the fact that i am getting a compile error, would the
values of vector v be changed after the statement : part1[2] = 3; ????
Is this even legal?
What would happen if i sent my slice over a channel and fiddled with it?
Is that allowed?
Paul
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