opIndexUnary post in-/decrement how to ?

[Tejas]

On Wednesday, 14 July 2021 at 14:39:03 UTC, vit wrote:
> 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 over
> 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];
> }
>
> ```

Oh... since it was asking for an lvalue, you just passed it by 
reference... seems so obvious in hindsight...

Nice.

Pity it doesn't seem to solve OP's problem.