On 1/10/14 7:20 AM, Nakamura wrote:
I'm new to rust, and tried going through some of the examples from the
OS class[0] that was taught in rust. However, I got tripped up by the
exercise, "make a function that takes an integer n and another function
|x| -> x, and returns a function that is n applications of the original
function."
I've been trying to see what the limits of rust are if you are using it
without the runtime/managed pointers etc, and it seems like I stumble
against one of the limits when trying to return functions. The big
question is where to allocate the new function I want to return.
Rust won't automatically allocate closed-over variables on the heap.
This limits the ability to write code like this naturally, but you get
the benefit that all allocations are immediately visible and under the
control of the programmer.
I would not suggest trying to use managed pointers for this. Instead I
would suggest `proc`, which is allocated on the exchange heap and can
close over variables. This should be sufficient for the question as
posed, as long as the "another function" has a `'static` bound (`'static
|x| -> x`).
Patrick
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