How do I pass multidimensional static arrays to functions expecting

[bearophile]

Timon Gehr Wrote:

> On 08/30/2011 03:20 AM, bearophile wrote:
> > Timon Gehr:
> >
> >> bar(array(map!((int[] a){return a;})(multi[])));
> >
> > Simpler:
> > bar( array(map!q{ a[] }(multi[])) );
> 
> And buggy. It returns slices of a local stack frame, because static 
> arrays are value types.

q{ a[] } does the same thing as (int[] a){return a;}, both return a slice of memory on the stack. Using a dynamic array (a slice) that uses memory allocated on the stack is correct. You just have to know what you are doing. It's the same as passing a fixed-sized array to a function that expects a dynamic slice. 

Andrej Mitrovic has said: "I was just trying to temporarily avoid GC allocation so I've used a static array instead of a dynamic ones."
If you replace the map function with q{ a.dup } you have heap memory, but Andrej is not happy.

Bye,
bearophile