idiomatic D: what to use instead of pointers in constructing a tree data structure?

[anonymous via Digitalmars-d-learn]

On Wednesday, 7 January 2015 at 20:25:10 UTC, Meta wrote:
> struct Tree
> {
>     this(string data, Tree[] children...)
>     {
>         this.data = data;
>         this.children = children;

Don't do this without `dup`ing. Quoting the documentation:

> An implementation may construct the object or array instance on 
> the stack. Therefore, it is an error to refer to that instance 
> after the variadic function has returned:
[...]
> int[] test(int[] a ...)
> {
>    return a;       // error, array contents invalid after return
>    return a[0..1]; // error, array contents invalid after return
>    return a.dup;   // ok, since copy is made
>}

http://dlang.org/function#variadic

>     }
>
>     string data;
>     Tree[] children;
> }