Struct immutable data and dict

[Timoses]

On Tuesday, 4 September 2018 at 12:27:47 UTC, nkm1 wrote:
> I also had this problem recently. I think aa.require() should 
> allow to add immutables (feature request). Anyway, my 
> workaround was along the lines of:
>
> final class AA(Key, Value)
> {
>     Value[] _storage;
>     size_t[Key] _aa;
>
>     void opIndexAssign(Value value, Key key)
>     {
>         if (key !in _aa)
>         {
>             _storage ~= value;
>             _aa[key] = _storage.length - 1;
>         }
>     }
>
>     Value opIndex(Key key)
>     {
>         if (auto index = key in _aa)
>             return _storage[*index];
>
>         throw new Exception("no key");
>     }
> }
>
> immutable struct S
> {
>     int num;
> }
>
> void main()
> {
>     import std.stdio : writeln;
>
>     auto aa = new AA!(string, S);
>
>     aa["one"] = S(1);
>     aa["two"] = S(2);
>
>     writeln(aa["one"]);
>     writeln(aa["two"]);
> }

Thanks for the replies. It seems quite annoying.

I just use classes for now.