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<title>BOOST_PP_LIST_APPEND_D</title>
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The <b>BOOST_PP_LIST_APPEND_D</b> macro appends two <i>lists</i>.
It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
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<h4>Usage</h4>
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<b>BOOST_PP_LIST_APPEND_D</b>(<i>d</i>, <i>a</i>, <i>b</i>)
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<h4>Arguments</h4>
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<dt>d</dt>
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The next available <b>BOOST_PP_WHILE</b> iteration.
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<dt>a</dt>
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The first <i>list</i>.
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<dt>b</dt>
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The second <i>list</i>.
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<h4>Remarks</h4>
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This macro appends two lists.
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>)),
this macro will expand to:
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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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<h4>See Also</h4>
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<li><a href="list_append.html">BOOST_PP_LIST_APPEND</a></li>
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<h4>Requirements</h4>
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<b>Header:</b> <a href="../headers/list/append.hpp.html"><boost/preprocessor/list/append.hpp></a>
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<h4>Sample Code</h4>
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#include <<a href="../headers/arithmetic/dec.hpp.html">boost/preprocessor/arithmetic/dec.hpp</a>>
#include <<a href="../headers/control/while.hpp.html">boost/preprocessor/control/while.hpp</a>>
#include <<a href="../headers/list/append.hpp.html">boost/preprocessor/list/append.hpp</a>>
#include <<a href="../headers/tuple/elem.hpp.html">boost/preprocessor/tuple/elem.hpp</a>>
#define LIST (1, (2, (3, <a href="nil.html">BOOST_PP_NIL</a>)))
#define PRED(d, state) <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(3, 1, state)
#define OP(d, state) \
( \
<a href="list_append_d.html">BOOST_PP_LIST_APPEND_D</a>( \
d, <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(3, 0, state), \
<a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(3, 2, state) \
), \
<a href="dec.html">BOOST_PP_DEC</a>( \
<a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(3, 1, state) \
), \
<a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(3, 2, state) \
) \
/**/
#define LIST_MULTIPLY(c, list) \
<a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>( \
3, 0, \
<a href="while.html">BOOST_PP_WHILE</a>( \
PRED, OP, \
(<a href="nil.html">BOOST_PP_NIL</a>, c, list) \
) \
) \
/**/
LIST_MULTIPLY(3, LIST)
// expands to (1, (2, (3, (1, (2, (3, (1, (2, (3, <a href="nil.html">BOOST_PP_NIL</a>)))))))))
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