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<TITLE>Programming in XPCE/Prolog: Section E.2</TITLE><LINK REL=home HREF="index.html">
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<H2><A NAME="sec:E.2"><SPAN class="sec-nr">E.2</SPAN> <SPAN class="sec-title">Practical 
considerations</SPAN></A></H2>

<P><A NAME="idx:objectmanagement:716"></A>The principal predicates <A NAME="idx:new2:717"></A><A class="pred" href="sec-D.1.html#new/2">new/2</A>, <A NAME="idx:send212:718"></A><A class="pred" href="sec-7.1.html#send/[2-12]">send/[2-12]</A> 
and <A NAME="idx:get313:719"></A><A class="pred" href="sec-D.1.html#get/3">get/[3-13]</A> 
will destroy all argument- and answer- objects created during their 
execution except for the object created by <A NAME="idx:new2:720"></A><A class="pred" href="sec-D.1.html#new/2">new/2</A> 
and the object returned by <A NAME="idx:get313:721"></A><A class="pred" href="sec-D.1.html#get/3">get/[3-13]</A>.

<P>An object created by <A NAME="idx:new2:722"></A><A class="pred" href="sec-D.1.html#new/2">new/2</A> 
with an integer (anonymous) object reference must either be attached to 
another object, locked against PCE's garbage collector or destroyed 
using <A NAME="idx:objectsenddone:723"></A>`<B>object<CODE>-&gt;</CODE>done</B>' 
if it is created during the
<EM>initialisation</EM> of the application or in a loop that is passed 
many times. Such objects will be automatically reclaimed if (1) the 
object is created while handling a user-event after handling the event 
is finished or (2) the object is created in the implementation of a 
method on a user-defined class and the method terminates execution.

<P>If is is not known whether or not the result of <A NAME="idx:get313:724"></A><A class="pred" href="sec-D.1.html#get/3">get/[3-13]</A> 
is a computed object the user should invoke <A NAME="idx:objectsenddone:725"></A>`<B>object<CODE>-&gt;</CODE>done</B>' 
to this result when the result is no longer needed. This will free the 
result if it was a computed (and no longer referenced) object and has no 
effect otherwise. If the result of the get operation is known to be an 
integer, no such message should be send.

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