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<a name="unitypes_002eh"></a>
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<h1 class="chapter"> <a href="libunistring.html#TOC9">3. Elementary types <code><unitypes.h></code></a> </h1>
<p>The include file <code><unitypes.h></code> provides the following basic types.
</p>
<dl>
<dt><u>Type:</u> <b>uint8_t</b>
<a name="IDX16"></a>
</dt>
<dt><u>Type:</u> <b>uint16_t</b>
<a name="IDX17"></a>
</dt>
<dt><u>Type:</u> <b>uint32_t</b>
<a name="IDX18"></a>
</dt>
<dd><p>These are the storage units of UTF-8/16/32 strings, respectively. The definitions are
taken from <code><stdint.h></code>, on platforms where this include file is present.
</p></dd></dl>
<dl>
<dt><u>Type:</u> <b>ucs4_t</b>
<a name="IDX19"></a>
</dt>
<dd><p>This type represents a single Unicode character, outside of an UTF-32 string.
</p></dd></dl>
<p>The types <code>ucs4_t</code> and <code>uint32_t</code> happen to be identical. They differ
in use and intent, however:
</p><ul>
<li>
Use <code>uint32_t *</code> to designate an UTF-32 string. Use <code>ucs4_t</code> to
designate a single Unicode character, outside of an UTF-32 string.
</li><li>
Conversions functions that take an UTF-32 string as input will usually perform
a range-check on the <code>uint32_t</code> values. Whereas functions that are
declared to take <code>ucs4_t</code> arguments will not perform such a range-check.
</li></ul>
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