On 5/2/16 1:43 PM, Namespace wrote:
On Monday, 2 May 2016 at 13:00:27 UTC, Erik Smith wrote:
Is there a way to initialize a static array and have it's size
inferred (and that works for arrays of structs using braced
literals)? This would make it easier to maintain longer static array
definitions. The code below doesn't work when removing the array size
even though the array is declared as static immutable.
import std.traits;
static immutable int[] a = [1,2,3];
static assert(isStaticArray!(typeof(a))); // fails
I still like
----
auto s(T, size_t n)(T[n] arr) {
return arr;
}
Interesting. But there is a major problem here...
auto arr = [1, 2, 3].s;
----
But of course this won't work:
----
int[] a = [1,2,3].s;
static assert(isStaticArray!(typeof(a))); // fails
----
And this is the problem.
Since 'a' is just a slice.
A slice of a no-longer-existing temporary! Admittedly, this is not an
issue with your code, but a deeper issue of allowing slicing of rvalues.
But this will work:
----
immutable auto a = [1,2,3].s;
----
You can drop auto. It's just a placeholder for the storage class in the
case where a storage class isn't specified.
-Steve
