opIndexUnary post in-/decrement how to ?

[vit]

On Wednesday, 14 July 2021 at 13:16:49 UTC, Tejas wrote:
> On Wednesday, 14 July 2021 at 13:09:56 UTC, vit wrote:
>> On Wednesday, 14 July 2021 at 12:49:58 UTC, Tejas wrote:
>>> [...]
>>
>> From doc: https://dlang.org/spec/operatoroverloading.html
>> Postincrement e++ and Postdecrement e-- Operators
>> These are not directly overloadable, but instead are rewritten 
>> in terms of the ++e and --e prefix operators:
>>
>> Postfix Operator Rewrites
>> op	rewrite
>> e--	(auto t = e, --e, t)
>> e++	(auto t = e, ++e, t)
>>
>>
>> Rewriting part doesn't work with operator overloading.
>
> If the rewriting part doesn't work with overloading then why 
> aren't we allowed to explicitly overload 
> ```post-increment/decrement``` operators?
>
> How else will the OP solve their problem?
>
> It must rewrite,  otherwise it's impossible (I think).


This work:

```d
import   std.stdio;

struct abc{
     int[100] a;

     ref int opIndex(int index)return{
         return a[index];
     }
}

void main (){
     abc s;
     s[0]++;
     ++s[0];
}

```