| Server IP : 80.241.246.6 / Your IP : 216.73.216.129 Web Server : Apache/2.4.25 (Debian) System : Linux kharagauli 4.9.0-19-amd64 #1 SMP Debian 4.9.320-2 (2022-06-30) x86_64 User : www-data ( 33) PHP Version : 7.0.33-0+deb9u12 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority, MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/share/doc/libffi6/html/ |
Upload File : |
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!--
This manual is for Libffi, a portable foreign-function interface
library.
Copyright (C) 2008, 2010, 2011 Red Hat, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version. A copy of the license is included in the
section entitled "GNU General Public License".
-->
<!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
<head>
<title>libffi: Complex</title>
<meta name="description" content="libffi: Complex">
<meta name="keywords" content="libffi: Complex">
<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="Index.html#Index" rel="index" title="Index">
<link href="Types.html#Types" rel="up" title="Types">
<link href="Complex-Type-Example.html#Complex-Type-Example" rel="next" title="Complex Type Example">
<link href="Type-Example.html#Type-Example" rel="prev" title="Type Example">
<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="Complex"></a>
<div class="header">
<p>
Next: <a href="Complex-Type-Example.html#Complex-Type-Example" accesskey="n" rel="next">Complex Type Example</a>, Previous: <a href="Type-Example.html#Type-Example" accesskey="p" rel="prev">Type Example</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> [<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Complex-Types"></a>
<h4 class="subsection">2.3.4 Complex Types</h4>
<p>‘<samp>libffi</samp>’ supports the complex types defined by the C99
standard (<code>_Complex float</code>, <code>_Complex double</code> and
<code>_Complex long double</code> with the built-in type descriptors
<code>ffi_type_complex_float</code>, <code>ffi_type_complex_double</code> and
<code>ffi_type_complex_longdouble</code>.
</p>
<p>Custom complex types like <code>_Complex int</code> can also be used.
An <code>ffi_type</code> object has to be defined to describe the
complex type to ‘<samp>libffi</samp>’.
</p>
<a name="index-ffi_005ftype-2"></a>
<dl>
<dt><a name="index-ffi_005ftype-3"></a>Data type: <strong>ffi_type</strong></dt>
<dd><dl compact="compact">
<dt><code>size_t size</code></dt>
<dd><p>This must be manually set to the size of the complex type.
</p>
</dd>
<dt><code>unsigned short alignment</code></dt>
<dd><p>This must be manually set to the alignment of the complex type.
</p>
</dd>
<dt><code>unsigned short type</code></dt>
<dd><p>For a complex type, this must be set to <code>FFI_TYPE_COMPLEX</code>.
</p>
</dd>
<dt><code>ffi_type **elements</code></dt>
<dd>
<p>This is a ‘<samp>NULL</samp>’-terminated array of pointers to
<code>ffi_type</code> objects. The first element is set to the
<code>ffi_type</code> of the complex’s base type. The second element
must be set to <code>NULL</code>.
</p></dd>
</dl>
</dd></dl>
<p>The section <a href="Complex-Type-Example.html#Complex-Type-Example">Complex Type Example</a> shows a way to determine
the <code>size</code> and <code>alignment</code> members in a platform
independent way.
</p>
<p>For platforms that have no complex support in <code>libffi</code> yet,
the functions <code>ffi_prep_cif</code> and <code>ffi_prep_args</code> abort
the program if they encounter a complex type.
</p>
</body>
</html>