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+<a name="Identifiers-1"></a>
+<h4 class="subsection">11.2.2 Identifiers</h4>
+<a name="index-identifier"></a>
+<a name="index-name"></a>
+<a name="index-IDENTIFIER_005fNODE"></a>
+
+<p>An <code>IDENTIFIER_NODE</code> represents a slightly more general concept
+than the standard C or C++ concept of identifier.  In particular, an
+<code>IDENTIFIER_NODE</code> may contain a &lsquo;<samp>$</samp>&rsquo;, or other extraordinary
+characters.
+</p>
+<p>There are never two distinct <code>IDENTIFIER_NODE</code>s representing the
+same identifier.  Therefore, you may use pointer equality to compare
+<code>IDENTIFIER_NODE</code>s, rather than using a routine like
+<code>strcmp</code>.  Use <code>get_identifier</code> to obtain the unique
+<code>IDENTIFIER_NODE</code> for a supplied string.
+</p>
+<p>You can use the following macros to access identifiers:
+</p><dl compact="compact">
+<dt><code>IDENTIFIER_POINTER</code>
+<a name="index-IDENTIFIER_005fPOINTER"></a>
+</dt>
+<dd><p>The string represented by the identifier, represented as a
+<code>char*</code>.  This string is always <code>NUL</code>-terminated, and contains
+no embedded <code>NUL</code> characters.
+</p>
+</dd>
+<dt><code>IDENTIFIER_LENGTH</code>
+<a name="index-IDENTIFIER_005fLENGTH"></a>
+</dt>
+<dd><p>The length of the string returned by <code>IDENTIFIER_POINTER</code>, not
+including the trailing <code>NUL</code>.  This value of
+<code>IDENTIFIER_LENGTH (x)</code> is always the same as <code>strlen
+(IDENTIFIER_POINTER (x))</code>.
+</p>
+</dd>
+<dt><code>IDENTIFIER_OPNAME_P</code>
+<a name="index-IDENTIFIER_005fOPNAME_005fP"></a>
+</dt>
+<dd><p>This predicate holds if the identifier represents the name of an
+overloaded operator.  In this case, you should not depend on the
+contents of either the <code>IDENTIFIER_POINTER</code> or the
+<code>IDENTIFIER_LENGTH</code>.
+</p>
+</dd>
+<dt><code>IDENTIFIER_TYPENAME_P</code>
+<a name="index-IDENTIFIER_005fTYPENAME_005fP"></a>
+</dt>
+<dd><p>This predicate holds if the identifier represents the name of a
+user-defined conversion operator.  In this case, the <code>TREE_TYPE</code> of
+the <code>IDENTIFIER_NODE</code> holds the type to which the conversion
+operator converts.
+</p>
+</dd>
+</dl>
+
+
+
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