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1 | <html> |
2 | <head> | |
3 | <title>BOOST_PP_RPAREN_IF</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_RPAREN_IF</b> macro conditionally expands to a right parenthesis. | |
9 | </div> | |
10 | <h4>Usage</h4> | |
11 | <div class="code"> | |
12 | <b>BOOST_PP_RPAREN_IF</b>(<i>cond</i>) | |
13 | </div> | |
14 | <h4>Arguments</h4> | |
15 | <dl> | |
16 | <dt>cond</dt> | |
17 | <dd> | |
18 | The condition that determines if a the macro expands to a right parenthesis or nothing. | |
19 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. | |
20 | </dd> | |
21 | </dl> | |
22 | <h4>Remarks</h4> | |
23 | <div> | |
24 | If <i>cond</i> expands to <i>0</i>, this macro expands to nothing. | |
25 | Otherwise, it expands to a right parenthesis. | |
26 | </div> | |
27 | <div> | |
28 | The preprocessor interprets parentheses as delimiters in macro invocations. | |
29 | Because of this, parentheses require special handling. | |
30 | </div> | |
31 | <h4>See Also</h4> | |
32 | <ul> | |
33 | <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li> | |
34 | <li><a href="lparen_if.html">BOOST_PP_LPAREN_IF</a></li> | |
35 | </ul> | |
36 | <h4>Requirements</h4> | |
37 | <div> | |
38 | <b>Header:</b> <a href="../headers/punctuation/paren_if.html"><boost/preprocessor/punctuation/paren_if.hpp></a> | |
39 | </div> | |
40 | <h4>Sample Code</h4> | |
41 | <div><pre> | |
42 | #include <<a href="../headers/punctuation/paren_if.html">boost/preprocessor/punctuation/paren_if.hpp</a>> | |
43 | ||
44 | #define MACRO(c, x) <a href="lparen_if.html">BOOST_PP_LPAREN_IF</a>(c) x <a href="rparen_if.html">BOOST_PP_RPAREN_IF</a>(c) | |
45 | ||
46 | MACRO(0, text) // expands to text | |
47 | MACRO(1, text) // expands to (text) | |
48 | </pre></div> | |
49 | <hr size="1"> | |
50 | <div style="margin-left: 0px;"> | |
51 |