a objects.
</p>

<h3 id="ffi_sizeof"><tt>size = ffi.sizeof(ct [,nelem])</tt></h3>
<p>
Returns the size of <tt>ct</tt> in bytes. Returns <tt>nil</tt> if
the size is not known (e.g. for <tt>"void"</tt> or function types).
Requires <tt>nelem</tt> for VLA/VLS types, except for cdata objects.
</p>

<h3 id="ffi_alignof"><tt>align = ffi.alignof(ct)</tt></h3>
<p>
Returns the minimum required alignment for <tt>ct</tt> in bytes.
</p>

<h3 id="ffi_offsetof"><tt>ofs [,bpos,bsize] = ffi.offsetof(ct, field)</tt></h3>
<p>