Duplicate

Description

Returns a clone, also known as a deep copy, of a variable. There is no reference to the original variable.

Returns

A clone of a variable.

Category

Structure functions, System functions

Function syntax

Duplicate(variable_name)

See also

StructCopy, other Structure functions; Modifying a ColdFusion XML object in Using XML and WDDX in ColdFusion MX Developer's Guide

History

ColdFusion MX: Changed behavior: this function can be used on XML objects.

Parameters

Parameter Description

variable_name

Name of a variable to duplicate

Usage

Use this function to duplicate complex structures, such as nested structures and queries.

Note: The Duplicate function throws an exception if you attempt to duplicate a CFC.

Note: With this function, you cannot duplicate a COM, CORBA, or JAVA object returned from the cfobject tag or the CreateObject function. If an array element or structure field is a COM, CORBA, or JAVA object, you cannot duplicate the array or structure.

Example

<h3>Duplicate Example</h3>
<cfset s1 = StructNew()>
<cfset s1.nested = StructNew()>
<cfset s1.nested.item = "original">
<cfset copy = StructCopy(s1)>
<cfset clone = Duplicate(s1)>
<!--- modify the original --->
<cfset s1.nested.item = "modified">
<cfoutput>
<p>The copy contains the modified value: #copy.nested.item#</p>
<p>The duplicate contains the original value: #clone.nested.item#</p>
</cfoutput>

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Version 7