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| <title>BOOST_PP_TUPLE_ELEM</title> |
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| The <b>BOOST_PP_TUPLE_ELEM</b> macro extracts an element from a <i>tuple</i>. |
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| <h4>Usage</h4> |
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| <b>BOOST_PP_TUPLE_ELEM</b>(<i>size</i>, <i>i</i>, <i>tuple</i>) |
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| <h4>Arguments</h4> |
| <dl> |
| <dt>size</dt> |
| <dd> |
| The size of the <i>tuple</i>. |
| Valid <i>tuple</i> sizes range from <i>0</i> to <b>BOOST_PP_LIMIT_TUPLE</b>. |
| </dd> |
| <dt>i</dt> |
| <dd> |
| The zero-based index into the <i>tuple</i> of the element to be extracted. |
| Valid values range from <i>0</i> to <i>size</i> - <i>1</i>. |
| </dd> |
| <dt>tuple</dt> |
| <dd> |
| The <i>tuple</i> from which an element is to be extracted. |
| </dd> |
| </dl> |
| <h4>Remarks</h4> |
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| The <i>size</i> argument must be the actual size of the <i>tuple</i>, |
| and <i>i</i> must be less than the size of the <i>tuple</i>. |
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| <h4>See Also</h4> |
| <ul> |
| <li><a href="limit_tuple.html">BOOST_PP_LIMIT_TUPLE</a></li> |
| </ul> |
| <h4>Requirements</h4> |
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| <b>Header:</b> <a href="../headers/tuple/elem.html"><boost/preprocessor/tuple/elem.hpp></a> |
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| <h4>Sample Code</h4> |
| <div><pre> |
| #include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>> |
| |
| #define TUPLE (a, b, c, d) |
| |
| <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(4, 0, TUPLE) // expands to a |
| <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(4, 3, TUPLE) // expands to d |
| </pre></div> |
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| <div style="margin-left: 0px;"> |
| <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> |
| </br><i>© Copyright Paul Mensonides 2002</i> |
| </div> |
| <div style="margin-left: 0px;"> |
| <p><small>Distributed under the Boost Software License, Version 1.0. (See |
| accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or |
| copy at <a href= |
| "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> |
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