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<head>
<title>lists.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
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<h4>Lists</h4>
<div>
A <i>list</i> is a simple cons-style list with a head and a tail.
The head of a <i>list</i> is an element,
and the tail is either another <i>list</i> or <b>BOOST_PP_NIL</b>.
For example,
</div>
<div class="code">
(<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>)))
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<div>
...is a <i>list</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and <i>c</i>.
</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>
Elements of a <i>list</i> can be extracted with
<b>BOOST_PP_LIST_FIRST</b> and <b>BOOST_PP_LIST_REST</b>.
</div>
<h4>Primitives</h4>
<ul>
<li><a href="../ref/list_first.html">BOOST_PP_LIST_FIRST</a></li>
<li><a href="../ref/list_rest.html">BOOST_PP_LIST_REST</a></li>
<li><a href="../ref/nil.html">BOOST_PP_NIL</a></li>
</ul>
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