<html lang="en">
<head>
<title>Identifiers - GNU Compiler Collection (GCC) Internals</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="GNU Compiler Collection (GCC) Internals">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="Tree-overview.html#Tree-overview" title="Tree overview">
<link rel="prev" href="Macros-and-Functions.html#Macros-and-Functions" title="Macros and Functions">
<link rel="next" href="Containers.html#Containers" title="Containers">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
Copyright (C) 1988-2015 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being ``Funding Free Software'', the Front-Cover
Texts being (a) (see below), and with the Back-Cover Texts being (b)
(see below). A copy of the license is included in the section entitled
``GNU Free Documentation License''.
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU
software. Copies published by the Free Software Foundation raise
funds for GNU development.-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family:serif; font-weight:normal; }
span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
</head>
<body>
<div class="node">
<a name="Identifiers"></a>
<p>
Next: <a rel="next" accesskey="n" href="Containers.html#Containers">Containers</a>,
Previous: <a rel="previous" accesskey="p" href="Macros-and-Functions.html#Macros-and-Functions">Macros and Functions</a>,
Up: <a rel="up" accesskey="u" href="Tree-overview.html#Tree-overview">Tree overview</a>
<hr>
</div>
<h4 class="subsection">10.2.2 Identifiers</h4>
<p><a name="index-identifier-1726"></a><a name="index-name-1727"></a><a name="index-IDENTIFIER_005fNODE-1728"></a>
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><span class="samp">$</span></samp>’, or other extraordinary
characters.
<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>You can use the following macros to access identifiers:
<dl>
<dt><code>IDENTIFIER_POINTER</code><a name="index-IDENTIFIER_005fPOINTER-1729"></a><dd>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.
<br><dt><code>IDENTIFIER_LENGTH</code><a name="index-IDENTIFIER_005fLENGTH-1730"></a><dd>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>.
<br><dt><code>IDENTIFIER_OPNAME_P</code><a name="index-IDENTIFIER_005fOPNAME_005fP-1731"></a><dd>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>.
<br><dt><code>IDENTIFIER_TYPENAME_P</code><a name="index-IDENTIFIER_005fTYPENAME_005fP-1732"></a><dd>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.
</dl>
<!-- -->
<!-- Containers -->
<!-- -->
</body></html>