<html lang="en">
<head>
<title>Debugging C Plus Plus - Debugging with GDB</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Debugging with GDB">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="C.html#C" title="C">
<link rel="prev" href="Debugging-C.html#Debugging-C" title="Debugging C">
<link rel="next" href="Decimal-Floating-Point.html#Decimal-Floating-Point" title="Decimal Floating Point">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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 ``Free Software'' and ``Free Software Needs
Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
and with the Back-Cover Texts as in (a) below.

(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
this GNU Manual.  Buying copies from GNU Press supports the FSF in
developing GNU and promoting software freedom.''-->
<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>
<link rel="stylesheet" type="text/css" href="../cs.css">
</head>
<body>
<div class="node">
<a name="Debugging-C-Plus-Plus"></a>
<p>
Next:&nbsp;<a rel="next" accesskey="n" href="Decimal-Floating-Point.html#Decimal-Floating-Point">Decimal Floating Point</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Debugging-C.html#Debugging-C">Debugging C</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="C.html#C">C</a>
<hr>
</div>

<h5 class="subsubsection">15.4.1.7 <span class="sc">gdb</span> Features for C<tt>++</tt></h5>

<p><a name="index-commands-for-C_0040t_007b_002b_002b_007d-814"></a>
Some <span class="sc">gdb</span> commands are particularly useful with C<tt>++</tt>, and some are
designed specifically for use with C<tt>++</tt>.  Here is a summary:

     
<a name="index-break-in-overloaded-functions-815"></a>
<dl><dt><span class="roman">breakpoint menus</span><dd>When you want a breakpoint in a function whose name is overloaded,
<span class="sc">gdb</span> has the capability to display a menu of possible breakpoint
locations to help you specify which function definition you want. 
See <a href="Ambiguous-Expressions.html#Ambiguous-Expressions">Ambiguous Expressions</a>.

     <p><a name="index-overloading-in-C_0040t_007b_002b_002b_007d-816"></a><br><dt><code>rbreak </code><var>regex</var><dd>Setting breakpoints using regular expressions is helpful for setting
breakpoints on overloaded functions that are not members of any special
classes. 
See <a href="Set-Breaks.html#Set-Breaks">Setting Breakpoints</a>.

     <p><a name="index-C_0040t_007b_002b_002b_007d-exception-handling-817"></a><br><dt><code>catch throw</code><dt><code>catch catch</code><dd>Debug C<tt>++</tt> exception handling using these commands.  See <a href="Set-Catchpoints.html#Set-Catchpoints">Setting Catchpoints</a>.

     <p><a name="index-inheritance-818"></a><br><dt><code>ptype </code><var>typename</var><dd>Print inheritance relationships as well as other information for type
<var>typename</var>. 
See <a href="Symbols.html#Symbols">Examining the Symbol Table</a>.

     <p><a name="index-C_0040t_007b_002b_002b_007d-symbol-display-819"></a><br><dt><code>set print demangle</code><dt><code>show print demangle</code><dt><code>set print asm-demangle</code><dt><code>show print asm-demangle</code><dd>Control whether C<tt>++</tt> symbols display in their source form, both when
displaying code as C<tt>++</tt> source and when displaying disassemblies. 
See <a href="Print-Settings.html#Print-Settings">Print Settings</a>.

     <br><dt><code>set print object</code><dt><code>show print object</code><dd>Choose whether to print derived (actual) or declared types of objects. 
See <a href="Print-Settings.html#Print-Settings">Print Settings</a>.

     <br><dt><code>set print vtbl</code><dt><code>show print vtbl</code><dd>Control the format for printing virtual function tables. 
See <a href="Print-Settings.html#Print-Settings">Print Settings</a>. 
(The <code>vtbl</code> commands do not work on programs compiled with the HP
ANSI C<tt>++</tt> compiler (<code>aCC</code>).)

     <p><a name="index-set-overload_002dresolution-820"></a><a name="index-overloaded-functions_002c-overload-resolution-821"></a><br><dt><code>set overload-resolution on</code><dd>Enable overload resolution for C<tt>++</tt> expression evaluation.  The default
is on.  For overloaded functions, <span class="sc">gdb</span> evaluates the arguments
and searches for a function whose signature matches the argument types,
using the standard C<tt>++</tt> conversion rules (see <a href="C-Plus-Plus-Expressions.html#C-Plus-Plus-Expressions">C<tt>++</tt> Expressions</a>, for details). 
If it cannot find a match, it emits a message.

     <br><dt><code>set overload-resolution off</code><dd>Disable overload resolution for C<tt>++</tt> expression evaluation.  For
overloaded functions that are not class member functions, <span class="sc">gdb</span>
chooses the first function of the specified name that it finds in the
symbol table, whether or not its arguments are of the correct type.  For
overloaded functions that are class member functions, <span class="sc">gdb</span>
searches for a function whose signature <em>exactly</em> matches the
argument types.

     <p><a name="index-show-overload_002dresolution-822"></a><br><dt><code>show overload-resolution</code><dd>Show the current setting of overload resolution.

     <br><dt><span class="roman">Overloaded symbol names</span><dd>You can specify a particular definition of an overloaded symbol, using
the same notation that is used to declare such symbols in C<tt>++</tt>: type
<var>symbol</var><code>(</code><var>types</var><code>)</code> rather than just <var>symbol</var>.  You can
also use the <span class="sc">gdb</span> command-line word completion facilities to list the
available choices, or to finish the type list for you. 
See <a href="Completion.html#Completion">Command Completion</a>, for details on how to do this. 
</dl>

   </body></html>