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- <a name="Lists-1"></a>
- <h2 class="section">3.1 Lists</h2>
- <p>The basic data structure used for representing virtual code and data in
- the <code>avram</code> library is declared as a <code>list</code>.
- <a name="index-lists-7"></a>
- <a name="index-head-field"></a>
- <a name="index-tail-field"></a>
- The <code>list</code> type is a pointer to a structure having a <code>head</code>
- field and a <code>tail</code> field, which are also lists. The empty tree,
- <code>nil</code>, is represented by the C constant <code>NULL</code>. A tree of the
- form <code>cons(<var>a</var>,<var>b</var>)</code> is represented in C as a list whose
- <code>head</code> is the representation of <code><var>a</var></code> and whose
- <code>tail</code> is the representation of <code><var>b</var></code>.
- </p>
- <p>A number of other fields in the structure are maintained automatically
- and should not be touched. For that matter, even the <code>head</code> and
- <code>tail</code> fields should be considered read-only. Because of sharing,
- it is almost never valid to modify a list “in place”, except for cases
- that are already covered by library functions.
- </p>
- <table class="menu" border="0" cellspacing="0">
- <tr><td align="left" valign="top"><a href="Simple-Operations.html#Simple-Operations">3.1.1 Simple Operations</a></td><td> </td><td align="left" valign="top">
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