projects / ceph.git / blame
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1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_VARIADIC_ELEM</title> | |
| 4 | <link rel="stylesheet" type="text/css" href="../styles.css"> | |
| 5 | </head> | |
| 6 | <body> | |
| 7 | <div style="margin-left: 0px;"> The <b>BOOST_PP_VARIADIC_ELEM</b> variadic macro | |
| 8 | extracts an element from <i>variadic data</i>. </div> | |
| 9 | <h4>Usage</h4> | |
| 10 | <div class="code"> <b>BOOST_PP_VARIADIC_ELEM</b>(<i>i</i>, <i>...</i>) <a href="../topics/variadic_macros.html#VNotation" target="_self"><sup>(v)</sup></a><br> | |
| 11 | </div> | |
| 12 | <h4>Arguments</h4> | |
| 13 | <dl><dt>i</dt> | |
| 14 | <dd> The zero-based index into the <i>variadic data</i> of the element to be | |
| 15 | extracted. Valid values range from <i>0</i> to the size of the variadic data - 1. | |
| 16 | </dd> | |
| 17 | <dt>...<br> | |
| 18 | </dt> | |
| 19 | <dd> The <i>variadic data</i> from which an element is to be extracted. </dd> | |
| 20 | </dl> | |
| 21 | <h4>Remarks</h4> | |
| 22 | <div>The index <i>i</i> must be less than the size of the <i>variadic data</i>. </div> | |
| 23 | <h4>See Also</h4> | |
| 24 | <ul> | |
| 25 | <li><a href="limit_variadic.html">BOOST_PP_LIMIT_VARIADIC</a></li> | |
| 26 | </ul> | |
| 27 | <h4>Requirements</h4> | |
| 28 | <div> <b>Header:</b> <a href="../headers/variadic/elem.html"><boost/preprocessor/variadic/elem.hpp></a> | |
| 29 | </div> | |
| 30 | <h4>Sample Code</h4> | |
| 31 | <div> | |
| 32 | <pre>#include <<a href="../headers/variadic/elem.html">boost/preprocessor/variadic/elem.hpp</a>><br><br>#define VAR_DATA a, b, c, d<br><br><a href="variadic_elem.html">BOOST_PP_VARIADIC_ELEM</a>(0, VAR_DATA) // expands to a<br><a href="variadic_elem.html">BOOST_PP_VARIADIC_ELEM</a>(3, VAR_DATA) // expands to d<br></pre> | |
| 33 | </div> | |
| 34 | <hr size="1"> | |
| 35 |