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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 ‘<samp>$</samp>’, 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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