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Library/boost/libs/preprocessor/doc/ref/deduce_d.html
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PatoFlamejanteTV
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19 дек 2024, 19:11
19 дек 2024, 19:11
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<html> <head> <title>BOOST_PP_DEDUCE_D</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <body> <div style="margin-left: 0px;"> The <b>BOOST_PP_DEDUCE_D</b> macro manually deduces the state of the <b>BOOST_PP_WHILE</b> construct. </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_DEDUCE_D</b>() </div> <h4>Remarks</h4> <div> This macro is intended to avoid the use of <i>automatic-recursion</i> at deep expansion depths. <i>Automatic-recursion</i> at such depths can be inefficient on some preprocessors. It is not intended to be used directly with the invocation of macros with a <b>_D</b> suffix such as: <div> <b>BOOST_PP_ADD_D</b>(<b>BOOST_PP_DEDUCE_D</b>(), <i>x</i>, <i>y</i>) </div> If it is used in this context, the <b>_D</b> macro will fail. The <b>_D</b> macros directly concatenate to the <i>d</i> parameter that is passed to them, which would prevent <b>BOOST_PP_DEDUCE_D</b>() from expanding. Furthermore, it is pointless to use this macro in a situation such as this because it would already be too late to gain any efficiency. </div> <h4>See Also</h4> <ul> <li><a href="while.html">BOOST_PP_WHILE</a></li> </ul> <h4>Requirements</h4> <div> <b>Header:</b> <a href="../headers/control/deduce_d.html"><boost/preprocessor/control/deduce_d.hpp></a> </div> <h4>Sample Code</h4> <div><pre> #include <<a href="../headers/arithmetic/add.html">boost/preprocessor/arithmetic/add.hpp</a>> #include <<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>> #include <<a href="../headers/arithmetic/sub.html">boost/preprocessor/arithmetic/sub.hpp</a>> #include <<a href="../headers/control/deduce_d.html">boost/preprocessor/control/deduce_d.hpp</a>> #include <<a href="../headers/punctuation/comma_if.html">boost/preprocessor/punctuation/comma_if.hpp</a>> #include <<a href="../headers/repetition/repeat.html">boost/preprocessor/repetition/repeat.hpp</a>> #include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>> #define RANGE(first, last) \ <a href="repeat.html">BOOST_PP_REPEAT</a>( \ <a href="inc.html">BOOST_PP_INC</a>( \ <a href="sub.html">BOOST_PP_SUB</a>(last, first) \ ), \ RANGE_M, \ (first, <a href="deduce_d.html">BOOST_PP_DEDUCE_D</a>()) \ ) \ /**/ #define RANGE_M(z, n, data) \ RANGE_M_2( \ n, \ <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 0, data), \ <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 1, data) \ ) \ /**/ #define RANGE_M_2(n, first, d) \ <a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) <a href="add_d.html">BOOST_PP_ADD_D</a>(d, n, first) \ /**/ RANGE(5, 10) // expands to 5, 6, 7, 8, 9, 10 </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>