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boost_preprocessor/doc/ref/seq_first_n.html

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<title>BOOST_PP_SEQ_FIRST_N</title>
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<div style="margin-left: 0px;">
The <b>BOOST_PP_SEQ_FIRST_N</b> macro expands to a <i>seq</i> of the first <i>n</i>
elements of a <i>seq</i>.
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<h4>
Usage
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<div class="code">
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<b>BOOST_PP_SEQ_FIRST_N</b>(<i>n</i>, <i>list</i>)
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<h4>
Arguments
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<dl>
<dt>n</dt>
<dd>
The number of elements to extract.
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<dt>list</dt>
<dd>
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The <i>seq</i> from which the elements are extracted.
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</dd>
</dl>
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<h4>
Remarks
</h4>
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<div>
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This macro extracts <i>n</i> elements from the beginning of <i>seq</i> and
returns them as a new <i>seq</i>
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<h4>
See Also
</h4>
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<ul>
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<li>
<a href="seq_rest_n.html">BOOST_PP_SEQ_REST_N</a></li>
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</ul>
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<h4>
Requirements
</h4>
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<div>
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<b>Header:</b> &nbsp;<a href="../headers/seq/first_n.hpp.html">&lt;boost/preprocessor/seq/first_n.hpp&gt;</a>
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<h4>
Sample Code
</h4>
<div>
<pre>
#include &lt;<a href="../headers/seq/first_n.hpp.html">boost/preprocessor/seq/first_n.hpp</a>&gt;
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#define SEQ (a)(b)(c)(d)(e)
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<a href="seq_first_n.html">BOOST_PP_SEQ_FIRST_N</a>(2, SEQ) // expands to (a)(b)
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