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preliminary set support

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[SVN r15908]
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Paul Mensonides
2002-10-13 05:47:23 +00:00
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<html>
<head>
<title>BOOST_PP_SET_FIRST_N</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_SET_FIRST_N</b> macro expands to a <i>set</i> of the first <i>n</i> elements of a <i>set</i>.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_SET_FIRST_N</b>(<i>n</i>, <i>list</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>n</dt>
<dd>
The number of elements to extract.
</dd>
<dt>list</dt>
<dd>
The <i>set</i> from which the elements are extracted.
</dd>
</dl>
<h4>Remarks</h4>
<div>
This macro extracts <i>n</i> elements from the beginning of <i>set</i> and returns them as a new <i>set</i>
</div>
<h4>See Also</h4>
<ul>
<li><a href="set_rest_n.html">BOOST_PP_SET_REST_N</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/set/first_n.hpp.html">&lt;boost/preprocessor/set/first_n.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/set/first_n.hpp.html">boost/preprocessor/set/first_n.hpp</a>&gt;
#define SET (a)(b)(c)(d)(e)
<a href="set_first_n.html">BOOST_PP_SET_FIRST_N</a>(2, SET) // expands to (a)(b)
</pre></div>
</body>
</html>