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<title>Boost.Preprocessor - Reference</title>
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<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
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<h1 align="center">Boost.Preprocessor</h1>
<h2 align="center">Reference</h2>
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<h1>#include <<a href="../../../../boost/preprocessor/list/adt.hpp">boost/preprocessor/list/adt.hpp</a>></h1>
<p>This header defines the fundamental list operations.</p>
<h3>Note</h3>
<ul>
<li>The internal representation of lists is hidden. Although there aren't
compelling reasons to change the representation, you should avoid
writing code that depends on the internal representation details.</li>
</ul>
<hr>
<h2><a name="BOOST_PP_LIST_CONS">#define BOOST_PP_LIST_CONS</a>(H,T)</h2>
<p>List constructor.</p>
<p>Lists are build using list constructors <a href="list_adt.htm#BOOST_PP_LIST_NIL">BOOST_PP_LIST_NIL</a> and
<a href="list_adt.htm#BOOST_PP_LIST_CONS">BOOST_PP_LIST_CONS</a>(). For example,</p>
<pre>
<a href="list_adt.htm#BOOST_PP_LIST_CONS">BOOST_PP_LIST_CONS</a>(1,
<a href="list_adt.htm#BOOST_PP_LIST_CONS">BOOST_PP_LIST_CONS</a>(2,
<a href="list_adt.htm#BOOST_PP_LIST_CONS">BOOST_PP_LIST_CONS</a>(3,
<a href="list_adt.htm#BOOST_PP_LIST_CONS">BOOST_PP_LIST_CONS</a>(4,
<a href="list_adt.htm#BOOST_PP_LIST_CONS">BOOST_PP_LIST_CONS</a>(5,
<a href="list_adt.htm#BOOST_PP_LIST_NIL">BOOST_PP_LIST_NIL</a>)))))
</pre>
<p>Short lists can also be build from tuples:</p>
<pre>
<a href="tuple_to_list.htm#BOOST_PP_TUPLE_TO_LIST">BOOST_PP_TUPLE_TO_LIST</a>(5,(1,2,3,4,5))
</pre>
<p>Both of the above lists contain 5 elements: 1, 2, 3, 4 and 5.</p>
<p>Longer lists can be built with the help of <a href="list_append.htm#BOOST_PP_LIST_APPEND">BOOST_PP_LIST_APPEND</a>().</p>
<hr>
<h2><a name="BOOST_PP_LIST_NIL">#define BOOST_PP_LIST_NIL</a></h2>
<p>List nil constructor.</p>
<hr>
<h2><a name="BOOST_PP_LIST_IS_CONS">#define BOOST_PP_LIST_IS_CONS</a>(L)</h2>
<p>Expands to 1 if the list is not nil and 0 otherwise.</p>
<hr>
<h2><a name="BOOST_PP_LIST_IS_NIL">#define BOOST_PP_LIST_IS_NIL</a>(L)</h2>
<p>Expands to 1 if the list is nil and 0 otherwise.</p>
<hr>
<h2><a name="BOOST_PP_LIST_FIRST">#define BOOST_PP_LIST_FIRST</a>(L)</h2>
<p>Expands to the first element of the list. The list must not be nil.</p>
<p>For example,</p>
<pre>
<a href="list_adt.htm#BOOST_PP_LIST_FIRST">BOOST_PP_LIST_FIRST</a>(<a href="tuple_to_list.htm#BOOST_PP_TUPLE_TO_LIST">BOOST_PP_TUPLE_TO_LIST</a>(5,(1,2,3,4,5)))
</pre>
<p>expands to 1.</p>
<hr>
<h2><a name="BOOST_PP_LIST_REST">#define BOOST_PP_LIST_REST</a>(L)</h2>
<p>Expands to a list of all but the first element of the list.</p>
<p>The list must not be nil.</p>
<p>For example,</p>
<pre>
<a href="list_adt.htm#BOOST_PP_LIST_REST">BOOST_PP_LIST_REST</a>(<a href="tuple_to_list.htm#BOOST_PP_TUPLE_TO_LIST">BOOST_PP_TUPLE_TO_LIST</a>(5,(1,2,3,4,5)))
</pre>
<p>expands to the same as:</p>
<pre>
<a href="tuple_to_list.htm#BOOST_PP_TUPLE_TO_LIST">BOOST_PP_TUPLE_TO_LIST</a>(4,(2,3,4,5))
</pre>
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