projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_LIST_IS_NIL</title> | |
| 4 | <link rel="stylesheet" type="text/css" href="../styles.css"> | |
| 5 | </head> | |
| 6 | <body> | |
| 7 | <div style="margin-left: 0px;"> | |
| 8 | The <b>BOOST_PP_LIST_IS_NIL</b> macro is a predicate that determines if a <i>list</i> is nil. | |
| 9 | </div> | |
| 10 | <h4>Usage</h4> | |
| 11 | <div class="code"> | |
| 12 | <b>BOOST_PP_LIST_IS_NIL</b>(<i>list</i>) | |
| 13 | </div> | |
| 14 | <h4>Arguments</h4> | |
| 15 | <dl> | |
| 16 | <dt>list</dt> | |
| 17 | <dd> | |
| 18 | A <i>list</i>. | |
| 19 | </dd> | |
| 20 | </dl> | |
| 21 | <h4>Remarks</h4> | |
| 22 | <div> | |
| 23 | If <i>list</i> is nil, this macro expands to <i>1</i>. | |
| 24 | Otherwise, it expands to <i>0</i>. | |
| 25 | </div> | |
| 26 | <h4>Requirements</h4> | |
| 27 | <div> | |
| 28 | <b>Header:</b> <a href="../headers/list/adt.html"><boost/preprocessor/list/adt.hpp></a> | |
| 29 | </div> | |
| 30 | <h4>Sample Code</h4> | |
| 31 | <div><pre> | |
| 32 | #include <<a href="../headers/list/adt.html">boost/preprocessor/list/adt.hpp</a>> | |
| 33 | ||
| 34 | #define LIST (a, <a href="nil.html">BOOST_PP_NIL</a>) | |
| 35 | ||
| 36 | <a href="list_is_nil.html">BOOST_PP_LIST_IS_NIL</a>(LIST) // expands to 0 | |
| 37 | <a href="list_is_nil.html">BOOST_PP_LIST_IS_NIL</a>(<a href="list_rest.html">BOOST_PP_LIST_REST</a>(LIST)) // expands to 1 | |
| 38 | </pre></div> | |
| 39 | <hr size="1"> | |
| 40 | <div style="margin-left: 0px;"> | |
| 41 |