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<a name="Primitive-Types"></a>
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<p>
Next: <a href="Structures.html#Structures" accesskey="n" rel="next">Structures</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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<a name="Primitive-Types-1"></a>
<h4 class="subsection">2.3.1 Primitive Types</h4>
<p><code>Libffi</code> provides a number of built-in type descriptors that can
be used to describe argument and return types:
</p>
<dl compact="compact">
<dt><code>ffi_type_void</code></dt>
<dd><a name="index-ffi_005ftype_005fvoid"></a>
<p>The type <code>void</code>. This cannot be used for argument types, only
for return values.
</p>
</dd>
<dt><code>ffi_type_uint8</code></dt>
<dd><a name="index-ffi_005ftype_005fuint8"></a>
<p>An unsigned, 8-bit integer type.
</p>
</dd>
<dt><code>ffi_type_sint8</code></dt>
<dd><a name="index-ffi_005ftype_005fsint8"></a>
<p>A signed, 8-bit integer type.
</p>
</dd>
<dt><code>ffi_type_uint16</code></dt>
<dd><a name="index-ffi_005ftype_005fuint16"></a>
<p>An unsigned, 16-bit integer type.
</p>
</dd>
<dt><code>ffi_type_sint16</code></dt>
<dd><a name="index-ffi_005ftype_005fsint16"></a>
<p>A signed, 16-bit integer type.
</p>
</dd>
<dt><code>ffi_type_uint32</code></dt>
<dd><a name="index-ffi_005ftype_005fuint32"></a>
<p>An unsigned, 32-bit integer type.
</p>
</dd>
<dt><code>ffi_type_sint32</code></dt>
<dd><a name="index-ffi_005ftype_005fsint32"></a>
<p>A signed, 32-bit integer type.
</p>
</dd>
<dt><code>ffi_type_uint64</code></dt>
<dd><a name="index-ffi_005ftype_005fuint64"></a>
<p>An unsigned, 64-bit integer type.
</p>
</dd>
<dt><code>ffi_type_sint64</code></dt>
<dd><a name="index-ffi_005ftype_005fsint64"></a>
<p>A signed, 64-bit integer type.
</p>
</dd>
<dt><code>ffi_type_float</code></dt>
<dd><a name="index-ffi_005ftype_005ffloat"></a>
<p>The C <code>float</code> type.
</p>
</dd>
<dt><code>ffi_type_double</code></dt>
<dd><a name="index-ffi_005ftype_005fdouble"></a>
<p>The C <code>double</code> type.
</p>
</dd>
<dt><code>ffi_type_uchar</code></dt>
<dd><a name="index-ffi_005ftype_005fuchar"></a>
<p>The C <code>unsigned char</code> type.
</p>
</dd>
<dt><code>ffi_type_schar</code></dt>
<dd><a name="index-ffi_005ftype_005fschar"></a>
<p>The C <code>signed char</code> type. (Note that there is not an exact
equivalent to the C <code>char</code> type in <code>libffi</code>; ordinarily you
should either use <code>ffi_type_schar</code> or <code>ffi_type_uchar</code>
depending on whether <code>char</code> is signed.)
</p>
</dd>
<dt><code>ffi_type_ushort</code></dt>
<dd><a name="index-ffi_005ftype_005fushort"></a>
<p>The C <code>unsigned short</code> type.
</p>
</dd>
<dt><code>ffi_type_sshort</code></dt>
<dd><a name="index-ffi_005ftype_005fsshort"></a>
<p>The C <code>short</code> type.
</p>
</dd>
<dt><code>ffi_type_uint</code></dt>
<dd><a name="index-ffi_005ftype_005fuint"></a>
<p>The C <code>unsigned int</code> type.
</p>
</dd>
<dt><code>ffi_type_sint</code></dt>
<dd><a name="index-ffi_005ftype_005fsint"></a>
<p>The C <code>int</code> type.
</p>
</dd>
<dt><code>ffi_type_ulong</code></dt>
<dd><a name="index-ffi_005ftype_005fulong"></a>
<p>The C <code>unsigned long</code> type.
</p>
</dd>
<dt><code>ffi_type_slong</code></dt>
<dd><a name="index-ffi_005ftype_005fslong"></a>
<p>The C <code>long</code> type.
</p>
</dd>
<dt><code>ffi_type_longdouble</code></dt>
<dd><a name="index-ffi_005ftype_005flongdouble"></a>
<p>On platforms that have a C <code>long double</code> type, this is defined.
On other platforms, it is not.
</p>
</dd>
<dt><code>ffi_type_pointer</code></dt>
<dd><a name="index-ffi_005ftype_005fpointer"></a>
<p>A generic <code>void *</code> pointer. You should use this for all
pointers, regardless of their real type.
</p></dd>
</dl>
<p>Each of these is of type <code>ffi_type</code>, so you must take the address
when passing to <code>ffi_prep_cif</code>.
</p>
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