Please help me clarify a point in the documentation relating to 'this' and
inheritance. If I can summarise so far:
Variables scope - private instance variables accessible to all methods and
pages included from the component and persists for the life of the object -
all super classes share the same variables scope in any one instance of a
class.
But what about this? - the documentation states that one cannot use the
'this' scope in super classes - meaning what? Please explain and use the
example below - or better...
If I define (pseudo code):
<component name='A'>
function init()
{
this.guid = createUUID();
_timeCreated = now();
}
</component>
and
<component name='B' extends='A'>
function init()
{
super.init();
{
</component>
Sincerely
Hardy
-----Original Message-----
From: Sean A Corfield [mailto:[EMAIL PROTECTED]
Sent: 26 September 2003 00:47
To: [EMAIL PROTECTED]
Subject: Re: [CFCDev] Top Ten Tips for Developing ColdFusion Components
On Thursday, Sep 25, 2003, at 13:24 US/Pacific, Matt Liotta wrote:
> However, if you provide a way to access data in the variables scope
> with a "getter" then you have provided a reference to that data right
> in the variables scope. In my book, if the data private to an object
> is mutatable then it is not encapsulated.
True - the getter would need to return a copy of the instance data
(e.g., using duplicate() or something similar) to avoid passing back a
reference to the 'variables' data. In some cases, passing back a
reference is fine. It's all about design!
Sean A Corfield -- http://www.corfield.org/blog/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
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