Error: cannot implicitly convert expression this.aa of type inout(string[string]) to string[string]

[Simen Kjærås]

On Thursday, 15 March 2018 at 12:00:08 UTC, Robert-D wrote:
> I want the function to create a mutable copy from a const or a 
> imutable
>
> Like this:
>
> void main() {
>     const S s = S(["": ""]);
>     S b = s.dup();
> }
>
> How can i do that?

In that case, the problem is that you also have to .dup the aa:

     S dup() const pure {
         return S(aa.dup);
     }

However, it seems aa.dup returns the wrong type - one would 
expect V[K] for inout(V[K]), but it returns inout(V)[K], or 
inout(string)[string], in your case. That's apparently a known 
bug: https://issues.dlang.org/show_bug.cgi?id=14148.

The solution for now, then, is this:

     S dup() const pure {
         return S(cast(string[string])aa.dup);
     }

--
   Simen