Forward Reference

[ketmar via Digitalmars-d-learn]

On Thu, 09 Oct 2014 19:04:55 +0000
Anibal via Digitalmars-d-learn <digitalmars-d-learn at puremagic.com>
wrote:

> Hi everyone,
> 
> I'm trying to something like a tree structure.
> 
> The following:
> 
> import std.container;
> class Tree
> {
>          private SList!Tree subTree;
> }
> 
> Produces: class Tree no size yet for forward reference.
> 
> How i should proceed in order to keep this declaration?
do you really need single-linked list for that? D has dynamic arrays,
which can be used instead.

  class Tree {
    private Tree[] subTree;
  }

you can append items to dynamic array with "~=", get it length
with .length and so on.

seems that you trying to copy some C code (or writing in C
manner), amirite? it is possible to use D as "better C", but D has alot
more to offer. did you seen this excellent book:
http://ddili.org/ders/d.en/ ?
it will teach you some nice things which are absent in C. read it even
if you are seasoned C programmer. you'll see a joy of dynamic arrays,
slices, ranges and templates, nicely explained.
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