From: -Gadget-nospam- AT vic DOT bigpond DOT net DOT au (Gadget)
Newsgroups: comp.lang.c++,comp.os.msdos.djgpp,comp.programming
Subject: Re: Question:  Linked lists and classes:  Self initiation
Date: Sat, 24 Apr 1999 02:51:07 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

A linked list is an iterative structure, not a recursive one.
A tree structure is recursive.
As was mentioned earlier, this makes an interesting stunt (stunt?!),
but is a bit like peeling oranges with a potato peeler. There are much
better and more efficient ways, so why make life difficult.
You wouldn't rewrite the code 'for (n=0 ; n<100; n++)' as a recursive
routine... or would you?

Cheers,
  Jason

On Fri, 23 Apr 1999 23:57:49 GMT, seth AT kansmen DOT com (Seth Jones) wrote:

>In article <3720D21C DOT 9617323B AT atlantis DOT stortek DOT com>, 
>matthto AT atlantis DOT stortek DOT com says...
>> Ishpeck wrote:
>> > 
>> > Is it fezible to have a linked list initiate itself recursively?  I
>> > think the best way to describe what I'm trying to say is put some
>> > code up...
>> > 
>> > class fooclass {
>> >   int number;
>> >   char character;
>> >   fooclass *next;
>> >   public:
>> >   void init(int setnum, char setchar, int quantity) {
>> >     number = setnum;
>> >     character = setchar;
>> >     if(quantity>0){
>> >       next = new(fooclass);
>> >       next.init(setnum, setchar, quantity-1);
>> >     }//end if
>> >   }//end init method
>> > };//end class
>> 
>> I don't understand.  How can initialization be recursive when initialization
>> occurs once?
>
>But a linked list is itself a recursive data structure. You can 
>initialize the entire list by initializing the first element, then 
>initializing the list consisting of everything after the head of the 
>first list. This is an "elegant" solution but not a particularly 
>efficient one.
>
>> 
>> Try this:
>>    fooclass(int setnum = 0, /* or a default value */
>>             char setchar = 0, /* or a default value */
>>             quantity = 0)
>>    : number(setnum), character(setchar), next(NULL)
>>    {
>>    }
>> 
>> I don't see how your init function relates to a linked list.  Is it creating
>> another node? another list?  inserting an element?
>> 
>Try tracing through the code with a relatively small value for 
>"quantity". Or go out and learn LISP.
>
>Seth Jones