|
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596 |
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <!-- Copyright (C) 1988-2020 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. -->
- <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <title>Empty Structures (Using the GNU Compiler Collection (GCC))</title>
-
- <meta name="description" content="Empty Structures (Using the GNU Compiler Collection (GCC))">
- <meta name="keywords" content="Empty Structures (Using the GNU Compiler Collection (GCC))">
- <meta name="resource-type" content="document">
- <meta name="distribution" content="global">
- <meta name="Generator" content="makeinfo">
- <link href="index.html#Top" rel="start" title="Top">
- <link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
- <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
- <link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">
- <link href="Variable-Length.html#Variable-Length" rel="next" title="Variable Length">
- <link href="Zero-Length.html#Zero-Length" rel="prev" title="Zero Length">
- <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="Empty-Structures"></a>
- <div class="header">
- <p>
- Next: <a href="Variable-Length.html#Variable-Length" accesskey="n" rel="next">Variable Length</a>, Previous: <a href="Zero-Length.html#Zero-Length" accesskey="p" rel="prev">Zero Length</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
- </div>
- <hr>
- <a name="Structures-with-No-Members"></a>
- <h3 class="section">6.19 Structures with No Members</h3>
- <a name="index-empty-structures"></a>
- <a name="index-zero_002dsize-structures"></a>
-
- <p>GCC permits a C structure to have no members:
- </p>
- <div class="smallexample">
- <pre class="smallexample">struct empty {
- };
- </pre></div>
-
- <p>The structure has size zero. In C++, empty structures are part
- of the language. G++ treats empty structures as if they had a single
- member of type <code>char</code>.
- </p>
-
-
-
- </body>
- </html>
|