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87 lines
2.8 KiB
HTML
87 lines
2.8 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_LIST_APPEND_D</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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<script language="javascript" type="text/javascript" src="../scripts.js"></script>
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</head>
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<body onload="init('sample');">
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_LIST_APPEND_D</b> macro appends two <i>lists</i>.
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It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_LIST_APPEND_D</b>(<i>d</i>, <i>a</i>, <i>b</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>d</dt>
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<dd>
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The next available <b>BOOST_PP_WHILE</b> iteration.
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</dd>
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<dt>a</dt>
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<dd>
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The first <i>list</i>.
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</dd>
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<dt>b</dt>
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<dd>
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The second <i>list</i>.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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This macro appends two lists.
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For example, if <i>a</i> is (<i>1</i>, (<i>2</i>, (<i>3</i>, <b>BOOST_PP_NIL</b>))) and <i>b</i> is (<i>4</i>, (<i>5</i>, <b>BOOST_PP_NIL</b>)),
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this macro will expand to:
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<div>
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(<i>1</i>, (<i>2</i>, (<i>3</i>, (<i>4</i>, (<i>5</i>, <b>BOOST_PP_NIL</b>)))))
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</div>
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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="list_append.html">BOOST_PP_LIST_APPEND</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/list/append.hpp.html"><boost/preprocessor/list/append.hpp></a>
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</div>
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<h4><a class="local" onclick="toggle('sample');" onmouseover="change(this);" onmouseout="revert(this);">Sample Code</a></h4>
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<div id="sample"><pre>
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#include <boost/preprocessor/arithmetic/dec.hpp>
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#include <boost/preprocessor/control/while.hpp>
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#include <boost/preprocessor/list/append.hpp>
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#include <boost/preprocessor/tuple/elem.hpp>
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#define LIST (1, (2, (3, BOOST_PP_NIL)))
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#define PRED(d, state) BOOST_PP_TUPLE_ELEM(3, 1, state)
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#define OP(d, state) /* .................. */ \
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( \
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BOOST_PP_LIST_APPEND_D( \
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d, BOOST_PP_TUPLE_ELEM(3, 0, state), \
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BOOST_PP_TUPLE_ELEM(3, 2, state) \
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), \
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BOOST_PP_DEC( \
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BOOST_PP_TUPLE_ELEM(3, 1, state) \
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), \
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BOOST_PP_TUPLE_ELEM(3, 2, state) \
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) \
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/**/
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#define LIST_MULTIPLY(c, list) /* ... */ \
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BOOST_PP_TUPLE_ELEM( \
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3, 0, \
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BOOST_PP_WHILE( \
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PRED, OP, \
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(BOOST_PP_NIL, c, list) \
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) \
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) \
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/**/
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LIST_MULTIPLY(3, LIST)
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// expands to (1, (2, (3, (1, (2, (3, (1, (2, (3, BOOST_PP_NIL)))))))))
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<pre></div>
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</body>
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</html>
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