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<a name="Identifiers"></a>
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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>
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<a name="Identifiers-1"></a>
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<h4 class="subsection">10.2.2 Identifiers</h4>
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<a name="index-identifier"></a>
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<a name="index-name"></a>
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<a name="index-IDENTIFIER_005fNODE"></a>
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<p>An <code>IDENTIFIER_NODE</code> represents a slightly more general concept
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than the standard C or C++ concept of identifier. In particular, an
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<code>IDENTIFIER_NODE</code> may contain a ‘<samp>$</samp>’, or other extraordinary
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characters.
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</p>
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<p>There are never two distinct <code>IDENTIFIER_NODE</code>s representing the
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same identifier. Therefore, you may use pointer equality to compare
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<code>IDENTIFIER_NODE</code>s, rather than using a routine like
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<code>strcmp</code>. Use <code>get_identifier</code> to obtain the unique
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<code>IDENTIFIER_NODE</code> for a supplied string.
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</p>
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<p>You can use the following macros to access identifiers:
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</p><dl compact="compact">
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<dt><code>IDENTIFIER_POINTER</code>
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<a name="index-IDENTIFIER_005fPOINTER"></a>
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</dt>
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<dd><p>The string represented by the identifier, represented as a
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<code>char*</code>. This string is always <code>NUL</code>-terminated, and contains
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no embedded <code>NUL</code> characters.
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</p>
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</dd>
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<dt><code>IDENTIFIER_LENGTH</code>
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<a name="index-IDENTIFIER_005fLENGTH"></a>
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</dt>
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<dd><p>The length of the string returned by <code>IDENTIFIER_POINTER</code>, not
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including the trailing <code>NUL</code>. This value of
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<code>IDENTIFIER_LENGTH (x)</code> is always the same as <code>strlen
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(IDENTIFIER_POINTER (x))</code>.
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</p>
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</dd>
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<dt><code>IDENTIFIER_OPNAME_P</code>
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<a name="index-IDENTIFIER_005fOPNAME_005fP"></a>
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</dt>
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<dd><p>This predicate holds if the identifier represents the name of an
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overloaded operator. In this case, you should not depend on the
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contents of either the <code>IDENTIFIER_POINTER</code> or the
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<code>IDENTIFIER_LENGTH</code>.
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</p>
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</dd>
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<dt><code>IDENTIFIER_TYPENAME_P</code>
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<a name="index-IDENTIFIER_005fTYPENAME_005fP"></a>
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</dt>
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<dd><p>This predicate holds if the identifier represents the name of a
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user-defined conversion operator. In this case, the <code>TREE_TYPE</code> of
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the <code>IDENTIFIER_NODE</code> holds the type to which the conversion
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operator converts.
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</p>
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