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<title>GNU libunistring: 3. Elementary types <unitypes.h></title>
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<table cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="libunistring_2.html#SEC8" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_4.html#SEC10" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_21.html#SEC92" title="Index">Index</a>]</td>
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<hr size="2">
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<a name="unitypes_002eh"></a>
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<a name="SEC9"></a>
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<h1 class="chapter"> <a href="libunistring_toc.html#TOC9">3. Elementary types <code><unitypes.h></code></a> </h1>
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<p>The include file <code><unitypes.h></code> provides the following basic types.
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</p>
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<dl>
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<dt><u>Type:</u> <b>uint8_t</b>
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<a name="IDX16"></a>
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</dt>
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<dt><u>Type:</u> <b>uint16_t</b>
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<a name="IDX17"></a>
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</dt>
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<dt><u>Type:</u> <b>uint32_t</b>
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<a name="IDX18"></a>
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</dt>
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<dd><p>These are the storage units of UTF-8/16/32 strings, respectively. The definitions are
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taken from <code><stdint.h></code>, on platforms where this include file is present.
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</p></dd></dl>
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<dl>
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<dt><u>Type:</u> <b>ucs4_t</b>
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<a name="IDX19"></a>
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</dt>
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<dd><p>This type represents a single Unicode character, outside of an UTF-32 string.
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</p></dd></dl>
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<p>The types <code>ucs4_t</code> and <code>uint32_t</code> happen to be identical. They differ
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in use and intent, however:
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</p><ul>
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<li>
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Use <code>uint32_t *</code> to designate an UTF-32 string. Use <code>ucs4_t</code> to
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designate a single Unicode character, outside of an UTF-32 string.
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</li><li>
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Conversions functions that take an UTF-32 string as input will usually perform
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a range-check on the <code>uint32_t</code> values. Whereas functions that are
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declared to take <code>ucs4_t</code> arguments will not perform such a range-check.
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</li></ul>
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<hr size="6">
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<table cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="libunistring_2.html#SEC8" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_4.html#SEC10" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_21.html#SEC92" title="Index">Index</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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