structDelete doesn't affect the shallow copy?
- by Travis
I was playing around onError so I tried to create an error using a large xml document object.
<cfset XMLByRef = variables.parsedXML.XMLRootElement.XMLChildElement>
<cfset structDelete(variables.parsedXML, "XMLRootElement")>
<cfset startXMLShortLoop = getTickCount()>
<cfloop from = "1" to = "#arrayLen(variables.XMLByRef)#" index = "variables.i">
<cfoutput>#variables.XMLByRef[variables.i].id.xmltext#</cfoutput><br />
</cfloop>
<cfset stopXMLShortLoop = getTickCount()>
I expected to get an error because I deleted the structure I was referencing.
From LiveDocs:
Variable Assignment - Creates an
additional reference, or alias, to the
structure. Any change to the data
using one variable name changes the
structure that you access using the
other variable name. This technique is
useful when you want to add a local
variable to another scope or otherwise
change a variable's scope without
deleting the variable from the
original scope.
instead I got
580df1de-3362-ca9b-b287-47795b6cdc17
25a00498-0f68-6f04-a981-56853c0844ed
...
...
...
db49ed8a-0ba6-8644-124a-6d6ebda3aa52
57e57e28-e044-6119-afe2-aebffb549342
Looped 12805 times in 297 milliseconds
<cfdump var = "#variables#">
Shows there's nothing in the structure, just parsedXML.xmlRoot.xmlName with the value of XMLRootElement.
I also tried
<cfset structDelete(variables.parsedXML.XMLRootElement, "XMLChildElement")>
as well as structClear for both.
More information on deleting from the xml document object.
http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-78e3.html
Can someone please explain my faulty logic? Thanks.
