[Lazarus] Declare record variant in it self

[Michael Van Canneyt]

On Thu, 7 May 2015, aradeonas wrote:

> Hi,
>  
> I have a record and it has some value and a value with type of that record it self like this example but compiler wont allow me to do this and give  "Type "TExampleRecord" is not
> completely defined" error,and I dont want to use class and keep creating and destroying it,they will be some simple record.
>  
>       //Works with class
>  
> TExample=class
>     s:string;
>     E:TExample;
>   end;
>  
> //Doesn't work with record
>  
>   TExampleRecord=record
>     s:string;
>     ER:TExampleRecord;
>   end;

You can never do this with records, it would recurse infinitely.

It works with a class, since a class is in fact just a pointer.

You must do

    PExampleRecord=^TExampleRecord;
    TExampleRecord=record
      s:string;
      ER:PExampleRecord;
    end;

and allocate the record on the heap.

Michael.