this is not an lvalue

[kink via Digitalmars-d-learn]

On Tuesday, 13 December 2016 at 16:23:16 UTC, Adam D. Ruppe wrote:
> On Tuesday, 13 December 2016 at 15:09:10 UTC, Andrey wrote:
>> void moveTo(ref Parameter parent) {
>
> You probably don't want the `ref` there, nor likely on any 
> other method definitions (especially check removeValue).

Assuming `Parameter` is a class and not a struct, yes. Be sure to 
check out the crucial distinction between the two in D (reference 
vs. value types, similar to C# class and struct), otherwise you 
won't get far.