opIndexAddAssign? ...

[Lionello Lunesu]

Manfred Nowak wrote:
> On writing the implementation of a map, where the Valuetype is a set, I 
> had to stop on recognizing, that only opIndexAssign is permitted.
> 
> I.e.:
>   map[ key]+= element;
> has no possible overload.
> 
> OpIndex delivers an rvalue and the only possibility to get an lvalue is 
> in conjunction with a plain assignment.
> 
> Why arbitrary restrictions when the goal is to have great 
> expressiveness? 
> 
> -manfred

opIndexAssign was needed because D has no "inout" return type. It's a 
hack, if you ask me.

L.