Local fixed sized arrays

[Smoke Adams via Digitalmars-d-learn]

On Monday, 27 June 2016 at 22:56:35 UTC, Ali Çehreli wrote:
> On 06/27/2016 02:58 PM, Smoke Adams wrote:
>> I'm in need of a way to create a local array that isn't GC'ed. 
>> It must
>> be dynamic in the sense of setting the size at compile time 
>> but it will
>> be used only in scope and only on structs.
>>
>> function x(int y)
>> {
>>     bool[y] arr;
>>
>>     arr ~= 3;
>>
>> }
>>
>> I care about slicing or anything but appending, removal, and 
>> indexing. I
>> don't even need bounds checking. I don't see a need to get 
>> locked in to
>> the GC for such simple cases.
>>
>>
>
> One way is to make x() a function template:
>
> import std.stdio;
>
> void x(int y)() {
>    bool[y] arr;
>    arr[y/2] = true;
>    writeln(arr);
> }
>
> void main() {
>     x!5();
> }
>
> Ali

But the length depends on runtime behavior. Might be 5 or 100. 
This doesn't handle it, does it?

I already make a simple malloc based array that does what I want. 
Looks like a normal array with ~=, [], foreach. Does what I need 
it to do. Only works with BasicTypes of course.