<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Copyright (C) 1988-2019 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 6.4, http://www.gnu.org/software/texinfo/ --> <head> <title>Pretty-Printer Example (Debugging with GDB)</title> <meta name="description" content="Pretty-Printer Example (Debugging with GDB)"> <meta name="keywords" content="Pretty-Printer Example (Debugging with GDB)"> <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="prev" title="Pretty-Printer Introduction"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} 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.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <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="prev">Pretty-Printer Introduction</a>, Up: <a href="Pretty-Printing.html#Pretty-Printing" accesskey="u" rel="up">Pretty Printing</a> [<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 = { <std::allocator<char>> = { <__gnu_cxx::new_allocator<char>> = { <No data fields>}, <No data fields> }, members of std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: _M_p = 0x804a014 "abcd" } } </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 = "abcd" </pre></div> </body> </html>