On 12/13/12 12:17 AM, Tom Lee wrote:
It looks like the 'move' operations here are directly modifying the
contents of the vector by moving data around in the vector. This
strikes me as kind of strange. I've allocated an immutable vector on
the exchange stack and so make the assumption that the contents of the
vector is in effect fixed. Is that assumption cast to the wind as soon
as I start working with a mutable, borrowed pointer to that same
vector?
Mutability inherits through ownership in Rust. This line actually
declares a mutable vector:
let mut values = ~["foo", "bar", "foo", "baz"];
For example, this will compile:
values[0] = ~"widget";
The reason why it works this way is so that you can transform values
from mutable to immutable and vice versa by simply moving them to a
mutable or immutable location. For instance, you could build up a
hashtable by mutating it, then place it in an immutable ARC box for many
tasks to access in parallel.
Patrick
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