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- <html>
- <head>
- <title>BOOST_PP_SUB_D</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
- </head>
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- <div style="margin-left: 0px;">
- The <b>BOOST_PP_SUB_D</b> macro expands to the difference between its second and third arguments.
- It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_SUB_D</b>(<i>d</i>, <i>x</i>, <i>y</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <dt>d</dt>
- <dd>
- The next available <b>BOOST_PP_WHILE</b> iteration.
- </dd>
- <dt>x</dt>
- <dd>
- The minuend of the operation.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
- </dd>
- <dt>y</dt>
- <dd>
- The subtrahend of the operation.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- 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>.
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
- <li><a href="sub.html">BOOST_PP_SUB</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/arithmetic/sub.html"><boost/preprocessor/arithmetic/sub.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/arithmetic/dec.html">boost/preprocessor/arithmetic/dec.hpp</a>>
- #include <<a href="../headers/arithmetic/sub.html">boost/preprocessor/arithmetic/sub.hpp</a>>
- #include <<a href="../headers/control/while.html">boost/preprocessor/control/while.hpp</a>>
- #include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>>
- #define PRED(d, data) <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 0, data)
- #define OP(d, data) \
- ( \
- <a href="dec.html">BOOST_PP_DEC</a>( \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 0, data) \
- ), \
- <a href="sub_d.html">BOOST_PP_SUB_D</a>( \
- d, \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 1, data), \
- 2 \
- ) \
- ) \
- /**/
- // decrement 'x' by 2 'n' times
- #define STRIDE(x, n) <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 1, <a href="while.html">BOOST_PP_WHILE</a>(PRED, OP, (n, x)))
- STRIDE(10, 2) // expands to 6
- STRIDE(14, 6) // expands to 2
- </pre></div>
- <hr size="1">
- <div style="margin-left: 0px;">
- <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
- </br><i>© Copyright Paul Mensonides 2002</i>
- </div>
- <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>
- </div>
- </body>
- </html>
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