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<a name="Containers"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Identifiers.html#Identifiers">Identifiers</a>,
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Up: <a rel="up" accesskey="u" href="Tree-overview.html#Tree-overview">Tree overview</a>
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<h4 class="subsection">10.2.3 Containers</h4>
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<p><a name="index-container-1733"></a><a name="index-list-1734"></a><a name="index-vector-1735"></a><a name="index-TREE_005fLIST-1736"></a><a name="index-TREE_005fVEC-1737"></a><a name="index-TREE_005fPURPOSE-1738"></a><a name="index-TREE_005fVALUE-1739"></a><a name="index-TREE_005fVEC_005fLENGTH-1740"></a><a name="index-TREE_005fVEC_005fELT-1741"></a>
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Two common container data structures can be represented directly with
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tree nodes. A <code>TREE_LIST</code> is a singly linked list containing two
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trees per node. These are the <code>TREE_PURPOSE</code> and <code>TREE_VALUE</code>
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of each node. (Often, the <code>TREE_PURPOSE</code> contains some kind of
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tag, or additional information, while the <code>TREE_VALUE</code> contains the
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majority of the payload. In other cases, the <code>TREE_PURPOSE</code> is
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simply <code>NULL_TREE</code>, while in still others both the
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<code>TREE_PURPOSE</code> and <code>TREE_VALUE</code> are of equal stature.) Given
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one <code>TREE_LIST</code> node, the next node is found by following the
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<code>TREE_CHAIN</code>. If the <code>TREE_CHAIN</code> is <code>NULL_TREE</code>, then
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you have reached the end of the list.
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<p>A <code>TREE_VEC</code> is a simple vector. The <code>TREE_VEC_LENGTH</code> is an
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integer (not a tree) giving the number of nodes in the vector. The
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nodes themselves are accessed using the <code>TREE_VEC_ELT</code> macro, which
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takes two arguments. The first is the <code>TREE_VEC</code> in question; the
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second is an integer indicating which element in the vector is desired.
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The elements are indexed from zero.
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