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- <title>BOOST_PP_SUB</title>
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- The <b>BOOST_PP_SUB</b> macro expands to the difference between its arguments.
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- <h4>Usage</h4>
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- <b>BOOST_PP_SUB</b>(<i>x</i>, <i>y</i>)
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- <h4>Arguments</h4>
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- <dt>x</dt>
- <dd>
- The minuend of the operation.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
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- <dt>y</dt>
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- The subtrahend of the operation.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
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- <h4>Remarks</h4>
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- 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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- Previously, this macro could not be used inside <b>BOOST_PP_WHILE</b>.
- There is no longer any such restriction.
- It is more efficient, however, to use <b>BOOST_PP_SUB_D</b> in such a situation.
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- <h4>See Also</h4>
- <ul>
- <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
- <li><a href="sub_d.html">BOOST_PP_SUB_D</a></li>
- </ul>
- <h4>Requirements</h4>
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- <b>Header:</b> <a href="../headers/arithmetic/sub.html"><boost/preprocessor/arithmetic/sub.hpp></a>
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- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/arithmetic/sub.html">boost/preprocessor/arithmetic/sub.hpp</a>>
- <a href="sub.html">BOOST_PP_SUB</a>(4, 3) // expands to 1
- </pre></div>
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- <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
- </br><i>© Copyright Paul Mensonides 2002</i>
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- <div style="margin-left: 0px;">
- <p><small>Distributed under the Boost Software License, Version 1.0. (See
- accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
- copy at <a href=
- "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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