is the array literal in a loop stack or heap allocated?

[H. S. Teoh]

On Wed, Oct 11, 2023 at 02:54:53AM +0000, mw via Digitalmars-d-learn wrote:
> Hi,
> 
> I want to confirm: in the following loop, is the array literal `a` vs.
> `b` stack or heap allocated? and how many times?
> 
> void main() {
> 
> int[2] a;

This is stack-allocated. Once per call to the function.


> int[] b;

This is an empty slice. It can refer to either stack or heap memory,
depending on what's assigned to it.


> int i;
> While(++i <=100) {
> 
>   a = [i, i+1];  // array literal

`a` is overwritten in-place once per loop.


>   b = [i, i+1];
[...]

A new array consisting of 2 elements is allocated, once per loop, and
assigned to b each time. Any arrays from previous iterations will be
collected by the GC eventually.


T

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