projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_COMMA</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_COMMA</b> macro expands to a comma. | |
| 9 | </div> | |
| 10 | <h4>Usage</h4> | |
| 11 | <div class="code"> | |
| 12 | <b>BOOST_PP_COMMA</b>() | |
| 13 | </div> | |
| 14 | <h4>Remarks</h4> | |
| 15 | <div> | |
| 16 | The preprocessor interprets commas as argument separators in macro invocations. | |
| 17 | Because of this, commas require special handling. | |
| 18 | </div> | |
| 19 | <h4>Requirements</h4> | |
| 20 | <div> | |
| 21 | <b>Header:</b> <a href="../headers/punctuation/comma.html"><boost/preprocessor/punctuation/comma.hpp></a> | |
| 22 | </div> | |
| 23 | <h4>Sample Code</h4> | |
| 24 | <div><pre> | |
| 25 | #include <<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>> | |
| 26 | #include <<a href="../headers/facilities/empty.html">boost/preprocessor/facilities/empty.hpp</a>> | |
| 27 | #include <<a href="../headers/punctuation/comma.html">boost/preprocessor/punctuation/comma.hpp</a>> | |
| 28 | ||
| 29 | <a href="if.html">BOOST_PP_IF</a>(1, <a href="comma.html">BOOST_PP_COMMA</a>, <a href="empty.html">BOOST_PP_EMPTY</a>)() // expands to , | |
| 30 | </pre></div> | |
| 31 | <hr size="1"> | |
| 32 | <div style="margin-left: 0px;"> | |
| 33 |