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 <a name="Identifiers"></a>
 <div class="header">
 <p>
 Next: <a href="Containers.html#Containers" accesskey="n" rel="next">Containers</a>, Previous: <a href="Macros-and-Functions.html#Macros-and-Functions" accesskey="p" rel="prev">Macros and Functions</a>, Up: <a href="Tree-overview.html#Tree-overview" accesskey="u" rel="up">Tree overview</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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 <hr>
 <a name="Identifiers-1"></a>
 <h4 class="subsection">10.2.2 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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	<a name="Identifiers"></a>
	<div class="header">
	<p>
	Next: <a href="Containers.html#Containers" accesskey="n" rel="next">Containers</a>, Previous: <a href="Macros-and-Functions.html#Macros-and-Functions" accesskey="p" rel="prev">Macros and Functions</a>, Up: <a href="Tree-overview.html#Tree-overview" accesskey="u" rel="up">Tree overview</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
	</div>
	<hr>
	<a name="Identifiers-1"></a>
	<h4 class="subsection">10.2.2 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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