projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_SUB</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_SUB</b> macro expands to the difference between its arguments. | |
| 9 | </div> | |
| 10 | <h4>Usage</h4> | |
| 11 | <div class="code"> | |
| 12 | <b>BOOST_PP_SUB</b>(<i>x</i>, <i>y</i>) | |
| 13 | </div> | |
| 14 | <h4>Arguments</h4> | |
| 15 | <dl> | |
| 16 | <dt>x</dt> | |
| 17 | <dd> | |
| 18 | The minuend of the operation. | |
| 19 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. | |
| 20 | </dd> | |
| 21 | <dt>y</dt> | |
| 22 | <dd> | |
| 23 | The subtrahend of the operation. | |
| 24 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. | |
| 25 | </dd> | |
| 26 | </dl> | |
| 27 | <h4>Remarks</h4> | |
| 28 | <div> | |
| 29 | If the difference between <i>x</i> and <i>y</i> is less than <i>0</i>, the result is saturated to <i>0</i>. | |
| 30 | </div> | |
| 31 | <div> | |
| 32 | Previously, this macro could not be used inside <b>BOOST_PP_WHILE</b>. | |
| 33 | There is no longer any such restriction. | |
| 34 | It is more efficient, however, to use <b>BOOST_PP_SUB_D</b> in such a situation. | |
| 35 | </div> | |
| 36 | <h4>See Also</h4> | |
| 37 | <ul> | |
| 38 | <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li> | |
| 39 | <li><a href="sub_d.html">BOOST_PP_SUB_D</a></li> | |
| 40 | </ul> | |
| 41 | <h4>Requirements</h4> | |
| 42 | <div> | |
| 43 | <b>Header:</b> <a href="../headers/arithmetic/sub.html"><boost/preprocessor/arithmetic/sub.hpp></a> | |
| 44 | </div> | |
| 45 | <h4>Sample Code</h4> | |
| 46 | <div><pre> | |
| 47 | #include <<a href="../headers/arithmetic/sub.html">boost/preprocessor/arithmetic/sub.hpp</a>> | |
| 48 | ||
| 49 | <a href="sub.html">BOOST_PP_SUB</a>(4, 3) // expands to 1 | |
| 50 | </pre></div> | |
| 51 | <hr size="1"> | |
| 52 | <div style="margin-left: 0px;"> | |
| 53 |