Can now use alias for collapsing multiple fields in nested structs

[ryuukk_]

On Saturday, 4 January 2025 at 20:01:33 UTC, Nick Treleaven wrote:
> On Thursday, 2 January 2025 at 21:14:25 UTC, ryuukk_ wrote:
>> On Thursday, 2 January 2025 at 19:08:06 UTC, Walter Bright 
>> wrote:
>>> On 1/2/2025 6:32 AM, Derek Fawcus wrote:
>>>> The closest native equivalent in D, would seem to be the 
>>>> following, making use of the new facility.
>>>> 
>>>> ```D
>>>> struct outer {
>>>>      int a;
>>>>      struct inner_ {
>>>>              int b;
>>>>              int c;
>>>>      }
>>>>      inner_ inner;
>>>>      int d;
>>>>      alias b = inner.b;
>>>>      alias c = inner.c;
>>>> };
>>>> ```
>>>> 
>>>> Or is there a nicer way to write that in D?
>>>
>>> ```
>>> struct outer {
>>>     int a;
>>>     struct {
>>>         int b;
>>>         int c;
>>>     }
>>>     int d;
>>> }
>>> ```
>>
>> that's hard to learn, why is it possible to do `outter.b = 42`?
>
> That's how it works in C11. The spec shows some useful use 
> cases:
>
> https://dlang.org/spec/struct.html#anonymous
>
>> ```
>> struct outer {
>>     int a;
>>     struct {
>>         int b;
>>         int c;
>>     } inner;
>>     int d;
>> }
>> ```
>>
>> now it is easier to learn, it is an anonymous struct called 
>> `inner`
>
> That complicates the parser, beginners would forget to type the 
> `;` after a struct definition and get confused at the parse 
> errors.
>
> Why do you need an anonymous struct type there? Naming it and 
> using the struct name for `inner` isn't difficult, and it 
> doesn't seem needed that often.

It's same story with tagged union, tuples, .enum, if you don't 
see them as improvements, there is nothing to argue about, try to 
use a language that supports them all, and you'll realize that 
it's like stepping up and upgrading your toolbox

You don't need class anymore, you don't need OOP anymore, you get 
empowered to use data driven development and it just is better