Re: Listing objects

Peter Fox wrote:
Following on from Lüpher Cypher's message. . . 
Hi,

Suppose we have a hierarchical class structure that looks something like
this:

Sorry, I lost the plot half way through.

Your objects can be
1 - nesting : object has a 'what are my children' and 'who is my parent' functionality.

2 - pointing : eg object has a 'these are my siblings' or 'previous/next' functionality

3 - dictionary entries : object in some container is discoverable by name


It is more of a [1] and [3] :)
[1] for I do have a tree-like structure of objects. I have $parent (for all objects) and $owner (for objects that are of subclasses of some class) properties so, I can go bottom-up. I also do have children array for objects that have owner so, I can go top-down.
[3] for I am trying to have a global associative array that has unqiue object names as keys and object references as values.

Variations and combinations of course apply. BUT every object exists in some context. I /think/ you might be trying to get A's to point-to/own B's where more than one A could be the parent of a B. Eg
"Sally is daughter of Jean"
"Geoffrey is son of Teddy"
"Sally is daughter of Teddy" // Only one Sally! J+T are married.

In this case[1] create an array of children and point to elements in that array from your parent objects.

eg $child['Sally'] = new ChildObj(.....);
then $Jean->AddChild('Sally') // just a key name or index
or $Jean->AddChild($child['Sally']) // inside the routine do $myKids[] = & $NewChild
where $NewChild is the function argument.

[1] If in this example children can be parents then you should be looking at a single universal 'person' class with the necessary links.


I do have a universal class :)
Say,

class Object
   var $name;
   var $owner;
   var $children[];


Now,

class A extends Object
class B extends Object

A's can be owned by A's and/or B's, B's can have many A's and/or B's
B's can be owned by A's and/or B's and can have many A's and/or B's as well.

One of the things I am trying to do is to have global references to all Objects:

global $objects;
$objects = array();

function Object() {
   global $objects;
   ... assign name ...
   $objects[$this->name] = &$this;
}

However, if a property of some Object changes, $objects[$object_name] still has the "old" object. I assume $objects[$object_name] does not reference the object then, rather has a copy of it. So far I was unable to solve this.. By the way, this will work:

$obj = new Object();
$objects[$obj->name] = &$obj;

if it is executed outside any function and any class..


luph
.

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