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<title>arrays.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
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<body>
<h4>Arrays</h4>
<div> An <i>array</i> is a data structure consisting of a two-element <i>tuple</i>.
The first element is the number of elements in the <i>array</i>.
The second element is another <i>tuple</i> of the elements in the <i>array</i>.
For example, </div>
<div class="code"> (<i>3</i>, (<i>a</i>, <i>b</i>, <i>c</i>)) </div>
<div> ...is an <i>array</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and
<i>c</i>. </div>
<div> The primary strength of <i>arrays</i> is that they store their own
size. Because of this, access to elements does not require the
size. It only requires that an element exists at a certain index. </div>
<div> This allows macro parameters to be variable in size and allows data
states to change size without the user explicitly keeping track of the
size independently.</div>
<div>With variadic macro support a <i>tuple </i>has all of the
functionality as an <i>array</i>, knows its own size, and is easier
syntactically to use. Because of that an <i>array</i> should be used, as
opposed to a <i>tuple</i>, only if your compiler does not support
variadic macros.<br>
<br>
Elements of an <i>array</i> can be extracted with <b>BOOST_PP_ARRAY_ELEM</b>,
an <i>array's</i> size can be extracted with <b>BOOST_PP_ARRAY_SIZE</b>,
and an <i>array</i> can be converted to the more primitive <i>tuple</i>
data structure with <b>BOOST_PP_ARRAY_DATA</b>. </div>
<h4>Primitives</h4>
<ul>
<li><a href="../ref/array_data.html">BOOST_PP_ARRAY_DATA</a></li>
<li><a href="../ref/array_elem.html">BOOST_PP_ARRAY_ELEM</a></li>
<li><a href="../ref/array_size.html">BOOST_PP_ARRAY_SIZE</a></li>
</ul>
<hr size="1">
<div style="margin-left: 0px;"> <i>© Copyright <a href="http://www.housemarque.com"
target="_top">Housemarque Oy</a> 2002</i> <br>
<i>© Copyright Paul Mensonides 2002</i> </div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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