no size yet for forward reference for nested structures

[ketmar via Digitalmars-d]

On Wed, 14 Jan 2015 10:41:07 +0000
qqiang via Digitalmars-d <digitalmars-d at puremagic.com> wrote:

> template PowerHeap(T) {
>      import std.container : SList;
> 
>      private alias PowerForest = SList!PowerNode;
> 
>      private final class PowerNode {
>          private {
>              T payload_;
>              uint rank_;
>              PowerForest children_;
>          }
>      }
> 
>      final class PowerHeap {
>          private {
>              PowerNode top_;
>              PowerForest forest_;
>              uint size_;
>          }
>      }
> }
> 
> unittest {
>      PowerHeap!int h;
> }
there is a circular dependency in your data structures. you're defining
`PowerNode` in the terms of... `PowerNode`. this won't work.

your `PowerForest` definition depends of complete `PowerNode`
definition, but `PowerNode` definition depends of complete
`PowerForest` definition.

don't do that.
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