<html> <head> <title>arrays.html</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <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> 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> </body> </html>
