I think you may be able to do what you are doing by using the ByteArray class
but I would wait for someone that knows more than me. The only things that get
passed by reference is any class that inherits from an Object and Array is a
native Flash player class in C++.
----- Original Message ----
From: Sherif Abdou <[EMAIL PROTECTED]>
To: flexcoders@yahoogroups.com
Sent: Wednesday, July 16, 2008 8:59:54 PM
Subject: Re: [flexcoders] Array reference vs values
If i remember correctly since I am mixing too much C++,ActionScript, Coldfusion
and learning them all the same time. Any of the primitive stuff in Actionscript
get passed only by value and not by reference so you can't do what you are
doing.
----- Original Message ----
From: Darren Houle <[EMAIL PROTECTED] com>
To: [EMAIL PROTECTED] ups.com
Sent: Wednesday, July 16, 2008 8:55:33 PM
Subject: RE: [flexcoders] Array reference vs values
Josh
Yes, what you're describing is exactly what I described and is, in fact, what
it happening... but to say I don't ever need to do this? Well... yes... I need
to do this... and it has nothing to do with the garbage collector.
Here, let me explain in another way....
I have a custom object... lets say it's a Person object. It has various
properties, but several are Date types. These are all consecutive, like a
workflow, and I want to be able to address them in order via an array... like
this...
var person : Person = new Person();
person.wakeup = new Date();
person.breakfast = new Date();
person.lunch = new Date();
person.dinner = null;
person.bedtime = null;
var timeArr : Array = new Array();
timeArr[0] = person.wakeup;
timeArr[1] = person.breakfast;
timeArr[2] = person.lunch;
timeArr[3] = person.dinner;
timeArr[4] = person.bedtime;
Then some other code figures out where we are in the flow of the day's events...
var status : int;
if (some criteria)
{ event = 2; }
But I determine lunch hasn't actually happened yet, so it shouldn't have a Date
yet. I need to blank out this value that was previously set in the Person
object...
if (some criteria)
{ timeArr[event] = null; }
But since these references don't seem to propogate backwards, nulling one of
the array elements doesn't affect the original property. That's the *whole
purpose* of reference vs value... a reference is a pointer to memory space...
so if I null that memory space it should affect all the vars pointing to that
memory space.
Does that make more sense?
Darren
________________________________
To: [EMAIL PROTECTED] ups.com
From: [EMAIL PROTECTED] com
Date: Thu, 17 Jul 2008 11:30:29 +1000
Subject: Re: [flexcoders] Array reference vs values
When you do this:
var date:Date = new Date();
You're creating an instance of Date and a reference to it named "date".
When you do this:
var ref:Date = arr[0] as Date;
You're creating another reference to the same instance, this time your
reference is named "ref". So when you set ref = null, you're making "ref" point
to nothing. "date" and "arr[0]" remain unchanged. You don't need to, nor can
you remove the date instance created above. That's the job of the garbage
collector.
-Josh
On Thu, Jul 17, 2008 at 11:25 AM, Darren Houle <[EMAIL PROTECTED] com> wrote:
This might be a basic AS question, but I encountered it building a
Flex app, so...
I create a Date
var date:Date = new Date();
I create an Array
var arr:Array = new Array();
I set the first element of the array equal to the date
arr[0] = date;
I create another date variable that refers to the first array element
var ref:Date = arr[0] as Date;
if I trace("date= "+date+", arr[0]="+arr[ 0]+", ref="+ref) I get
date=Wed Jul 16 21:04:45 GMT-0400 2008, arr[0]=Wed Jul 16 21:04:45
GMT-0400 2008, ref=Wed Jul 16 21:04:45 GMT-0400 2008
Now I null out the ref variable
ref=null;
Since AS uses references instead of values I would expect to null out
the original date, but no...
If I trace("date= "+date+", arr[0]="+arr[ 0]+", ref="+ref) I now get
date=Wed Jul 16 21:04:45 GMT-0400 2008, arr[0]=Wed Jul 16 21:04:45
GMT-0400 2008, ref=null
I thought everything was a reference in AS? Shouldn't nulling ref
also null arr[0] which would null out date?
Ultimately.. . I have a custom object that has several fields each
containing a Date. I create an array and make each element in the
array = each Date in the custom obj. I need to be able to null an
array element and have it carry backwards into the object and null
out the original Date. Any ideas? Am I missing something really
obvious?
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