A recent discussion https://github.com/D-Programming-Language/dmd/pull/3452 brought up a matter I'd forgotten - struct fields that are immutable and have initializer are deprecated.

Why?

Andrei

On Tue, 29 Apr 2014 13:09:01 -0400, Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> wrote:

> A recent discussion https://github.com/D-Programming-Language/dmd/pull/3452 brought up a matter I'd forgotten - struct fields that are immutable and have initializer are deprecated.
>
> Why?

I think possibly it has to do with the fact that they originally did not get stored per-instance. I remember a conversation about this (being a bad thing), but have not searched the NG for it.

-Steve

On Tuesday, 29 April 2014 at 17:11:50 UTC, Steven Schveighoffer wrote:
> On Tue, 29 Apr 2014 13:09:01 -0400, Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> wrote:
>
>> A recent discussion https://github.com/D-Programming-Language/dmd/pull/3452 brought up a matter I'd forgotten - struct fields that are immutable and have initializer are deprecated.
>>
>> Why?
>
> I think possibly it has to do with the fact that they originally did not get stored per-instance. I remember a conversation about this (being a bad thing), but have not searched the NG for it.

http://dlang.org/changelog#staticfields2

In future release, non-static const or immutable field will be made an instance field.

struct S
{
    immutable int x = 1;
}
static assert(S.sizeof == int.sizeof);   // will succeed in the future

So current "implicit static" behavior is now deprecated.

Related:
http://dlang.org/changelog#staticfields
http://dlang.org/changelog#staticfields2

Kenji Hara


2014-04-30 2:09 GMT+09:00 Andrei Alexandrescu via Digitalmars-d < digitalmars-d@puremagic.com>:

> A recent discussion https://github.com/D-Programming-Language/dmd/pull/ 3452 brought up a matter I'd forgotten - struct fields that are immutable and have initializer are deprecated.
>
> Why?
>
> Andrei
>

On 4/29/14, 10:18 AM, Kenji Hara via Digitalmars-d wrote:
> In future release, non-static const or immutable field will be made an
> instance field.
>
> struct S
> {
>      immutable int x = 1;
> }
> static assert(S.sizeof == int.sizeof);   // will succeed in the future
>
> So current "implicit static" behavior is now deprecated.
>
> Related:
> http://dlang.org/changelog#staticfields
> http://dlang.org/changelog#staticfields2
>
> Kenji Hara

That makes sense - thanks Nick and Kenji! -- Andrei