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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Foreign Object Representation and Access</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="UFFI Reference Guide" /><link rel="up" href="notes.html" title="Chapter 2. Programming Notes" /><link rel="prev" href="notes.html" title="Chapter 2. Programming Notes" /><link rel="next" href="optimizing.html" title="Optimizing Code Using UFFI" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Foreign Object Representation and Access</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="notes.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Programming Notes</th><td width="20%" align="right"> <a accesskey="n" href="optimizing.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Foreign Object Representation and Access"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="object-represen"></a>Foreign Object Representation and Access</h2></div></div></div><p> There are two main approaches used to represent foreign
objects: an integer that represents an address in memory, and a
object that also includes run-time typing. The advantage of
run-time typing is the system can dereference pointers and perform
array access without those functions requiring a type at the cost
of additional overhead to generate and store the run-time
typing. The advantage of integer representation, at least for
<span class="application">AllegroCL</span>, is that the compiler can generate inline code to
dereference pointers. Further, the overhead of the run-time type
information is eliminated. The disadvantage is the program must
then supply
the type to the functions to dereference objects and array.
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