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boost_preprocessor/doc/ref/seq_elem.html

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<title>BOOST_PP_SEQ_ELEM</title>
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<div style="margin-left: 0px;">
The <b>BOOST_PP_SEQ_ELEM</b> macro extracts an element from a <i>seq</i>.
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<h4>
Usage
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<b>BOOST_PP_SEQ_ELEM</b>(<i>i</i>, <i>list</i>)
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<h4>
Arguments
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<dl>
<dt>i</dt>
<dd>
The zero-based index of the element to be extracted.
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<dt>seq</dt>
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<dd>
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The <i>seq</i> from which an element is to be extracted.
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</dd>
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<h4>
Remarks
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The index <i>i</i> must be in the range of <i>0</i> to <b>BOOST_PP_SEQ_SIZE</b>(<i>seq</i>)
- <i>1</i>.
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<h4>
Requirements
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<b>Header:</b> &nbsp;<a href="../headers/seq/elem.hpp.html">&lt;boost/preprocessor/seq/elem.hpp&gt;</a>
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<h4>
Sample Code
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<pre>
#include &lt;<a href="../headers/seq/elem.hpp.html">boost/preprocessor/seq/elem.hpp</a>&gt;
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<a href="seq_elem.html">BOOST_PP_SEQ_ELEM</a>(1, (a)(b)(c)) // expands to b
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#define SEQ \
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(0)(1)(2)(3)(4)(5)(6)(7)(8)(9) \
(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) \
(20)(21)(22)(23)(24)(25)(26)(27)(28)(29) \
(30)(31)(32)(33)(34)(35)(36)(37)(38)(39) \
(40)(41)(42)(43)(44)(45)(46)(47)(48)(49) \
(50)(51)(52)(53)(54)(55)(56)(57)(58)(59) \
(60)(61)(62)(63)(64)(65)(66)(67)(68)(69) \
(70)(71)(72)(73)(74)(75)(76)(77)(78)(79) \
(80)(81)(82)(83)(84)(85)(86)(87)(88)(89) \
(90)(91)(92)(93)(94)(95)(96)(97)(98)(99) \
/**/
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<a href="seq_elem.html">BOOST_PP_SEQ_ELEM</a>(88, SEQ) // expands to 88
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