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| 1 | <html> |
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| 2 | <head> |
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| 3 | <title>BOOST_PP_SUB</title> |
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| 4 | <link rel="stylesheet" type="text/css" href="../styles.css"> |
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| 5 | </head> |
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| 6 | <body> |
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| 7 | <div style="margin-left: 0px;"> |
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| 8 | The <b>BOOST_PP_SUB</b> macro expands to the difference between its arguments. |
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| 9 | </div> |
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| 10 | <h4>Usage</h4> |
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| 11 | <div class="code"> |
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| 12 | <b>BOOST_PP_SUB</b>(<i>x</i>, <i>y</i>) |
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| 13 | </div> |
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| 14 | <h4>Arguments</h4> |
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| 15 | <dl> |
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| 16 | <dt>x</dt> |
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| 17 | <dd> |
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| 18 | The minuend of the operation. |
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| 19 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. |
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| 20 | </dd> |
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| 21 | <dt>y</dt> |
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| 22 | <dd> |
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| 23 | The subtrahend of the operation. |
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| 24 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. |
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| 25 | </dd> |
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| 26 | </dl> |
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| 27 | <h4>Remarks</h4> |
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| 28 | <div> |
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| 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>. |
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| 30 | </div> |
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| 31 | <div> |
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| 32 | Previously, this macro could not be used inside <b>BOOST_PP_WHILE</b>. |
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| 33 | There is no longer any such restriction. |
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| 34 | It is more efficient, however, to use <b>BOOST_PP_SUB_D</b> in such a situation. |
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| 35 | </div> |
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| 36 | <h4>See Also</h4> |
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| 37 | <ul> |
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| 38 | <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li> |
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| 39 | <li><a href="sub_d.html">BOOST_PP_SUB_D</a></li> |
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| 40 | </ul> |
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| 41 | <h4>Requirements</h4> |
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| 42 | <div> |
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| 43 | <b>Header:</b> <a href="../headers/arithmetic/sub.html"><boost/preprocessor/arithmetic/sub.hpp></a> |
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| 44 | </div> |
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| 45 | <h4>Sample Code</h4> |
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| 46 | <div><pre> |
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| 47 | #include <<a href="../headers/arithmetic/sub.html">boost/preprocessor/arithmetic/sub.hpp</a>> |
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| 48 | |
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| 49 | <a href="sub.html">BOOST_PP_SUB</a>(4, 3) // expands to 1 |
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| 50 | </pre></div> |
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| 51 | </body> |
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| 52 | </html> |
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