blame | history | raw
hc
2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">


<html>


<!-- Copyright (C) 1988-2021 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." -->


<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->


<head>


<title>Debugging with GDB: Pretty-Printer Example</title>


 


<meta name="description" content="Debugging with GDB: Pretty-Printer Example">


<meta name="keywords" content="Debugging with GDB: Pretty-Printer Example">


<meta name="resource-type" content="document">


<meta name="distribution" content="global">


<meta name="Generator" content="makeinfo">


<meta http-equiv="Content-Type" content="text/html; charset=utf-8">


<link href="index.html#Top" rel="start" title="Top">


<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">


<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">


<link href="Pretty-Printing.html#Pretty-Printing" rel="up" title="Pretty Printing">


<link href="Pretty_002dPrinter-Commands.html#Pretty_002dPrinter-Commands" rel="next" title="Pretty-Printer Commands">


<link href="Pretty_002dPrinter-Introduction.html#Pretty_002dPrinter-Introduction" rel="previous" title="Pretty-Printer Introduction">


<style type="text/css">


<!--


a.summary-letter {text-decoration: none}


blockquote.smallquotation {font-size: smaller}


div.display {margin-left: 3.2em}


div.example {margin-left: 3.2em}


div.indentedblock {margin-left: 3.2em}


div.lisp {margin-left: 3.2em}


div.smalldisplay {margin-left: 3.2em}


div.smallexample {margin-left: 3.2em}


div.smallindentedblock {margin-left: 3.2em; font-size: smaller}


div.smalllisp {margin-left: 3.2em}


kbd {font-style:oblique}


pre.display {font-family: inherit}


pre.format {font-family: inherit}


pre.menu-comment {font-family: serif}


pre.menu-preformatted {font-family: serif}


pre.smalldisplay {font-family: inherit; font-size: smaller}


pre.smallexample {font-size: smaller}


pre.smallformat {font-family: inherit; font-size: smaller}


pre.smalllisp {font-size: smaller}


span.nocodebreak {white-space:nowrap}


span.nolinebreak {white-space:nowrap}


span.roman {font-family:serif; font-weight:normal}


span.sansserif {font-family:sans-serif; font-weight:normal}


ul.no-bullet {list-style: none}


-->


</style>


 


 


</head>


 


<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">


<a name="Pretty_002dPrinter-Example"></a>


<div class="header">


<p>


Next: <a href="Pretty_002dPrinter-Commands.html#Pretty_002dPrinter-Commands" accesskey="n" rel="next">Pretty-Printer Commands</a>, Previous: <a href="Pretty_002dPrinter-Introduction.html#Pretty_002dPrinter-Introduction" accesskey="p" rel="previous">Pretty-Printer Introduction</a>, Up: <a href="Pretty-Printing.html#Pretty-Printing" accesskey="u" rel="up">Pretty Printing</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>


</div>


<hr>


<a name="Pretty_002dPrinter-Example-1"></a>


<h4 class="subsection">10.9.2 Pretty-Printer Example</h4>


 


<p>Here is how a C<tt>++</tt> <code>std::string</code> looks without a pretty-printer:


</p>


<div class="smallexample">


<pre class="smallexample">(gdb) print s


$1 = {


  static npos = 4294967295, 


  _M_dataplus = {


    &lt;std::allocator&lt;char&gt;&gt; = {


      &lt;__gnu_cxx::new_allocator&lt;char&gt;&gt; = {


        &lt;No data fields&gt;}, &lt;No data fields&gt;


      },


    members of std::basic_string&lt;char, std::char_traits&lt;char&gt;,


      std::allocator&lt;char&gt; &gt;::_Alloc_hider:


    _M_p = 0x804a014 &quot;abcd&quot;


  }


}


</pre></div>


 


<p>With a pretty-printer for <code>std::string</code> only the contents are printed:


</p>


<div class="smallexample">


<pre class="smallexample">(gdb) print s


$2 = &quot;abcd&quot;


</pre></div>


 


 


 


 


</body>


</html>