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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
          "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
  <META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
  <title>Clang - C++ Support</title>
  <link type="text/css" rel="stylesheet" href="menu.css" />
  <link type="text/css" rel="stylesheet" href="content.css" />
  <style type="text/css">
</style>
</head>
<body>

<!--#include virtual="menu.html.incl"-->

<div id="content">

<!--*************************************************************************-->
<h1>C++ Support in Clang</h1>
<!--*************************************************************************-->

<p>
This page tracks the status of C++ support in Clang.<br>
Currently most of the C++ features are missing; here you can find features that are at least partially supported in Clang. </p>


<!-- Within this table: The colors we're using to color-code our level
of support for a given section:

       White (no background): not considered/tested.
       #C11B17: Broken.
       #F88017: Some useful examples work
       #FDD017: Many examples work
       #347C17: Nearly everything works
       #00FF00 + check mark: Implementation complete!
  -->

<p>The following table is used to help track our implementation
  progress toward implementing the complete C++03 standard. We use a
  simple, somewhat arbitrary color-coding scheme to describe the
  relatively completeness of features by section:</p>

<table width="689" border="1" cellspacing="0">
  <tr>
    <th>Not started/not evaluated</th>
    <th>Not Applicable</th>
    <th>Broken</th>
    <th>Some examples work</th>
    <th>Many examples work</th>
    <th>Nearly everything works</th>
    <th>Complete!</th>
  </tr>
  <tr>
    <td></td>
    <td bgcolor="#C0C0C0">N/A</td>    
    <td bgcolor="#C11B17"></td>
    <td bgcolor="#F88017"></td>
    <td bgcolor="#FDD017"></td>
    <td bgcolor="#347C17"></td>
    <td bgcolor="#00FF00" align="center">&#x2713;</td>
  </tr>
</table>

<p>A feature is "complete" when the appropriate Clang component (Parse, AST,
Sema, CodeGen) implements the behavior described in all of the
paragraphs in the relevant C++ standard. Note that many C++ features are
actually described in several different sections within the standard. The major components are:</p>

<dl>
  <dt>Parse</dt>
  <dd>Clang is able to parse the grammar of this feature (or the grammar described by this section), but does not necessarily do anything with the parsed result. Use Clang's <code>-fsyntax-only</code> option to parse C++ programs.</dd>

  <dt>AST</dt>
  <dd>Clang builds an abstract syntax tree (AST) for the feature, but does not necessarily perform any type-checking. Use Clang's <code>-ast-print</code> option to print the resulting ASTs.</dd>

  <dt>Sema</dt>
  <dd>Clang parses and type-checks this feature and provides a well-formed AST  annotated with types. Use Clang's <code>-fsyntax-only</code> to type-check code.</dd>

  <dt>CodeGen</dt>
  <dd>Clang parses, type-checks, and generates code for this feature, allowing one to compile and execute programs.</dd>
</dl>

<p>Updates to this table are welcome! Since Clang already supports
much of C, and therefore much C++, many of the currently-white cells
could be filled in. If you wish to do so, please compare Clang's
implementation against the C++ standard and provide a patch that
updates the table accordingly. Tests for the various features are also
welcome!</p>

<table width="689" border="1" cellspacing="0">
  <tr>
    <th>Section</th>
    <th>Parse</th>
    <th>AST</th>
    <th>Sema</th>
    <th>CodeGen</th>
    <th>Notes</th>
  </tr>
<tr>
  <td>2 [lex]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td></td>
</tr>
<tr>
  <td>&nbsp;&nbsp;2.1 [lex.phases]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td></td>
</tr>
<tr>
  <td>&nbsp;&nbsp;2.2 [lex.charset]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td></td>
</tr>
<tr>
  <td>&nbsp;&nbsp;2.3 [lex.trigraph]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td></td>
</tr>
<tr>
  <td>&nbsp;&nbsp;2.4 [lex.pptoken]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td></td>
</tr>
<tr>
  <td>&nbsp;&nbsp;2.5 [lex.digraph]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td></td>
</tr>
<tr>
  <td>&nbsp;&nbsp;2.6 [lex.token]</td>
  <td></td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0">N/A</td>
  <td bgcolor="#C0C0C0"