120 lines
4.6 KiB
HTML
120 lines
4.6 KiB
HTML
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This manual is for Libffi, a portable foreign-function interface
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library.
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Copyright (C) 2008, 2010, 2011 Red Hat, Inc.
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Permission is granted to copy, distribute and/or modify this document
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<link href="Types.html#Types" rel="up" title="Types">
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<link href="Complex-Type-Example.html#Complex-Type-Example" rel="next" title="Complex Type Example">
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<a name="Complex"></a>
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<div class="header">
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<p>
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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>
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<hr>
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<a name="Complex-Types"></a>
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<h4 class="subsection">2.3.4 Complex Types</h4>
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<p>‘<samp>libffi</samp>’ supports the complex types defined by the C99
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standard (<code>_Complex float</code>, <code>_Complex double</code> and
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<code>_Complex long double</code> with the built-in type descriptors
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<code>ffi_type_complex_float</code>, <code>ffi_type_complex_double</code> and
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<code>ffi_type_complex_longdouble</code>.
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</p>
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<p>Custom complex types like <code>_Complex int</code> can also be used.
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An <code>ffi_type</code> object has to be defined to describe the
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complex type to ‘<samp>libffi</samp>’.
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</p>
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<a name="index-ffi_005ftype-2"></a>
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<dl>
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<dt><a name="index-ffi_005ftype-3"></a>Data type: <strong>ffi_type</strong></dt>
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<dd><dl compact="compact">
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<dt><code>size_t size</code></dt>
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<dd><p>This must be manually set to the size of the complex type.
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</p>
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</dd>
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<dt><code>unsigned short alignment</code></dt>
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<dd><p>This must be manually set to the alignment of the complex type.
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</p>
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</dd>
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<dt><code>unsigned short type</code></dt>
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<dd><p>For a complex type, this must be set to <code>FFI_TYPE_COMPLEX</code>.
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</p>
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</dd>
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<dt><code>ffi_type **elements</code></dt>
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<dd>
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<p>This is a ‘<samp>NULL</samp>’-terminated array of pointers to
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<code>ffi_type</code> objects. The first element is set to the
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<code>ffi_type</code> of the complex’s base type. The second element
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must be set to <code>NULL</code>.
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</p></dd>
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</dl>
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</dd></dl>
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<p>The section <a href="Complex-Type-Example.html#Complex-Type-Example">Complex Type Example</a> shows a way to determine
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the <code>size</code> and <code>alignment</code> members in a platform
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independent way.
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</p>
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<p>For platforms that have no complex support in <code>libffi</code> yet,
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the functions <code>ffi_prep_cif</code> and <code>ffi_prep_args</code> abort
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the program if they encounter a complex type.
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</p>
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