On Sunday, 2 October 2022 at 23:45:45 UTC, drug007 wrote:
It works but not as someone could expect. In case of
```D
Foo[2] arr = void;
```
`arr` value is not defined, it is not an initialized array of
uninitialized elements like you want, it is just uninitialized
array.
This is incorrect. It is not possible to declare an uninitialized
static array variable in D; only the elements are affected by `=
void`.
The meta data of a static array like `Foo[2] arr` (`.ptr` and
`.length`) is determined statically at compile time and inserted
where needed into the generated code. It is not stored in mutable
memory the way a dynamic array/slice's meta data is, and does not
need to be initialized at run time.
By contrast, it **is** possible to declare a completely
uninitialized dynamic array, or to just leave its elements
uninitialized:
```D
// Meta data is not initialized, and no elements are
allocated.
// This has no static array equivalent:
int[] arrA = void;
// Meta data is initialized, and elements are allocated but
not initialized.
// This is the dynamic equivalent of the static:
// int[2] arr = void;
int[] arrB = uninitializedArray!(int[])(2);
```
