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<h4 class="subsection">2.3.2 Structures</h4>
<p>Although ‘<samp><span class="samp">libffi</span></samp>’ has no special support for unions or
bit-fields, it is perfectly happy passing structures back and forth.
You must first describe the structure to ‘<samp><span class="samp">libffi</span></samp>’ by creating a
new <code>ffi_type</code> object for it.
<p><a name="index-ffi_005ftype-34"></a>
<div class="defun">
— ffi_type: <var><a name="index--35"></a></var><br>
<blockquote><p>The <code>ffi_type</code> has the following members:
<dl>
<dt><code>size_t size</code><dd>This is set by <code>libffi</code>; you should initialize it to zero.
<br><dt><code>unsigned short alignment</code><dd>This is set by <code>libffi</code>; you should initialize it to zero.
<br><dt><code>unsigned short type</code><dd>For a structure, this should be set to <code>FFI_TYPE_STRUCT</code>.
<br><dt><code>ffi_type **elements</code><dd>This is a ‘<samp><span class="samp">NULL</span></samp>’-terminated array of pointers to <code>ffi_type</code>
objects. There is one element per field of the struct.
</dl>
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