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Edit File: Complex.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for libffi, a portable foreign function interface library. Copyright (C) 2008-2019, 2021 Anthony Green and Red Hat, Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --> <title>Complex (libffi: the portable foreign function interface library)</title> <meta name="description" content="Complex (libffi: the portable foreign function interface library)"> <meta name="keywords" content="Complex (libffi: the portable foreign function interface library)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta name="viewport" content="width=device-width,initial-scale=1"> <link href="index.html" rel="start" title="Top"> <link href="Index.html" rel="index" title="Index"> <link href="Types.html" rel="up" title="Types"> <link href="Complex-Type-Example.html" rel="next" title="Complex Type Example"> <link href="Type-Example.html" rel="prev" title="Type Example"> <style type="text/css"> <!-- a.copiable-anchor {visibility: hidden; text-decoration: none; line-height: 0em} a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} div.display {margin-left: 3.2em} div.example {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} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} span:hover a.copiable-anchor {visibility: visible} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <div class="subsection" id="Complex"> <div class="header"> <p> Next: <a href="Complex-Type-Example.html" accesskey="n" rel="next">Complex Type Example</a>, Previous: <a href="Type-Example.html" accesskey="p" rel="prev">Type Example</a>, Up: <a href="Types.html" accesskey="u" rel="up">Types</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p> </div> <hr> <span id="Complex-Types"></span><h4 class="subsection">2.3.6 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> <span id="index-ffi_005ftype-2"></span> <dl class="def"> <dt id="index-ffi_005ftype-3"><span class="category">Data type: </span><span><strong>ffi_type</strong><a href='#index-ffi_005ftype-3' class='copiable-anchor'> ¶</a></span></dt> <dd><dl compact="compact"> <dt><span><code>size_t size</code></span></dt> <dd><p>This must be manually set to the size of the complex type. </p> </dd> <dt><span><code>unsigned short alignment</code></span></dt> <dd><p>This must be manually set to the alignment of the complex type. </p> </dd> <dt><span><code>unsigned short type</code></span></dt> <dd><p>For a complex type, this must be set to <code>FFI_TYPE_COMPLEX</code>. </p> </dd> <dt><span><code>ffi_type **elements</code></span></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</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> </div> </body> </html>
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