projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_LPAREN</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_LPAREN</b> macro expands to a left parenthesis. | |
| 9 | </div> | |
| 10 | <h4>Usage</h4> | |
| 11 | <div class="code"> | |
| 12 | <b>BOOST_PP_LPAREN</b>() | |
| 13 | </div> | |
| 14 | <h4>Remarks</h4> | |
| 15 | <div> | |
| 16 | The preprocessor interprets parentheses as delimiters in macro invocations. | |
| 17 | Because of this, parentheses require special handling. | |
| 18 | </div> | |
| 19 | <h4>See Also</h4> | |
| 20 | <ul> | |
| 21 | <li><a href="rparen.html">BOOST_PP_RPAREN</a></li> | |
| 22 | </ul> | |
| 23 | <h4>Requirements</h4> | |
| 24 | <div> | |
| 25 | <b>Header:</b> <a href="../headers/punctuation/paren.html"><boost/preprocessor/punctuation/paren.hpp></a> | |
| 26 | </div> | |
| 27 | <h4>Sample Code</h4> | |
| 28 | <div><pre> | |
| 29 | #include <<a href="../headers/punctuation/paren.html">boost/preprocessor/punctuation/paren.hpp</a>> | |
| 30 | ||
| 31 | #define X(x) x | |
| 32 | #define MACRO(p, x) X p x ) | |
| 33 | ||
| 34 | MACRO(<a href="lparen.html">BOOST_PP_LPAREN</a>(), abc) // expands to abc | |
| 35 | ||
| 36 | #define Y(x) | |
| 37 | ||
| 38 | MACRO((10) Y <a href="lparen.html">BOOST_PP_LPAREN</a>(), result) // expands to 10 | |
| 39 | </pre></div> | |
| 40 | <hr size="1"> | |
| 41 | <div style="margin-left: 0px;"> | |
| 42 |