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<div id="projectname">ICU 74.2
 <span id="projectnumber">74.2</span>
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<div class="title">ICU 74.2 Documentation</div> </div>
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<div class="textblock"><h1><a class="anchor" id="API"></a>
API Reference Usage</h1>
<h3>C++ Programmers:</h3>
<p>Use <a href="hierarchy.html">Class Hierarchy</a> or <a href="classes.html">Alphabetical List </a> or <a href="annotated.html">Compound List</a> to find the class you are interested in. For example, to find BreakIterator, you can go to the <a href="classes.html">Alphabetical List</a>, then click on "BreakIterator". Once you are at the class, you will find an inheritance chart, a list of the public members, a detailed description of the class, then detailed member descriptions.</p>
<h3>C Programmers:</h3>
<p>Use <a href="#Module">Module List</a> or <a href="globals_u.html">File Members</a> to find a list of all the functions and constants. For example, to find BreakIterator functions you would click on <a href="files.html">File List</a>, then find "ubrk.h" and click on it. You will find descriptions of Defines, Typedefs, Enumerations, and Functions, with detailed descriptions below. If you want to find a specific function, such as <a class="el" href="ubrk_8h.html#aa0851c6d6403e5f87060a862dddf6b84" title="Advance the iterator to the boundary following the current boundary. ">ubrk_next()</a>, then click first on <a href="globals.html">File Members</a>, then use your browser Find dialog to search for "ubrk_next()".</p>
<h3>API References for Previous Releases</h3>
<p>The API References for each release of ICU are also available as a zip file from the ICU <a href="https://icu.unicode.org/download">download page</a>.</p>
<hr/>
<h2>Architecture (User's Guide)</h2>
<ul>
<li>
<a href="https://unicode-org.github.io/icu/userguide/">Introduction</a> </li>
<li>
<a href="https://unicode-org.github.io/icu/userguide/i18n">Internationalization</a> </li>
<li>
<a href="https://unicode-org.github.io/icu/userguide/design">Locale Model, Multithreading, Error Handling, etc.</a> </li>
<li>
<a href="https://unicode-org.github.io/icu/userguide/conversion">Conversion</a> </li>
</ul>
<hr/>
<p> <h2><a NAME="Module">Module List</a></h2> </p><table border="1" cols="3" align="center">
<tr>
<td><b>Module Name</b> </td><td><b>C</b> </td><td><b>C++</b> </td></tr>
<tr>
<td>Basic Types and Constants </td><td><a class="el" href="utypes_8h.html" title="Basic definitions for ICU, for both C and C++ APIs. ">utypes.h</a> </td><td><a class="el" href="utypes_8h.html" title="Basic definitions for ICU, for both C and C++ APIs. ">utypes.h</a> </td></tr>
<tr>
<td>Strings and Character Iteration </td><td><a class="el" href="ustring_8h.html" title="C API: Unicode string handling functions. ">ustring.h</a>, <a class="el" href="utf8_8h.html" title="C API: 8-bit Unicode handling macros. ">utf8.h</a>, <a class="el" href="utf16_8h.html" title="C API: 16-bit Unicode handling macros. ">utf16.h</a>, <a class="el" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory. ">icu::StringPiece</a>, <a class="el" href="structUText.html" title="UText struct. ">UText</a>, <a class="el" href="structUCharIterator.html" title="C API for code unit iteration. ">UCharIterator</a>, <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">icu::ByteSink</a> </td><td><a class="el" href="classicu_1_1UnicodeString.html" title="UnicodeString is a string class that stores Unicode characters directly and provides similar function...">icu::UnicodeString</a>, <a class="el" href="classicu_1_1CharacterIterator.html" title="Abstract class that defines an API for iteration on text objects. ">icu::CharacterIterator</a>, <a class="el" href="classicu_1_1Appendable.html" title="Base class for objects to which Unicode characters and strings can be appended. ">icu::Appendable</a>, <a class="el" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory. ">icu::StringPiece</a>,<a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">icu::ByteSink</a> </td></tr>
<tr>
<td>Unicode Character<br />
Properties and Names </td><td><a class="el" href="uchar_8h.html" title="C API: Unicode Properties. ">uchar.h</a>, <a class="el" href="uscript_8h.html" title="C API: Unicode Script Information. ">uscript.h</a> </td><td>C API </td></tr>
<tr>
<td>Sets of Unicode Code Points and Strings </td><td><a class="el" href="uset_8h.html" title="C API: Unicode Set. ">uset.h</a> </td><td><a class="el" href="classicu_1_1UnicodeSet.html" title="A mutable set of Unicode characters and multicharacter strings. ">icu::UnicodeSet</a> </td></tr>
<tr>
<td>Maps from Unicode Code Points to Integer Values </td><td><a class="el" href="ucptrie_8h.html" title="C API: This file defines an immutable Unicode code point trie. ">ucptrie.h</a>, <a class="el" href="umutablecptrie_8h.html" title="C API: This file defines a mutable Unicode code point trie. ">umutablecptrie.h</a> </td><td>C API </td></tr>
<tr>
<td>Maps from Strings to Integer Values </td><td>(no C API) </td><td><a class="el" href="classicu_1_1BytesTrie.html" title="Light-weight, non-const reader class for a BytesTrie. ">icu::BytesTrie</a>, <a class="el" href="classicu_1_1UCharsTrie.html" title="Light-weight, non-const reader class for a UCharsTrie. ">icu::UCharsTrie</a> </td></tr>
<tr>
<td>Codepage Conversion </td><td><a class="el" href="ucnv_8h.html" title="C API: Character conversion. ">ucnv.h</a>, <a class="el" href="ucnvsel_8h.html" title="C API: Encoding/charset encoding selector. ">ucnvsel.h</a> </td><td>C API </td></tr>
<tr>
<td>Codepage Detection </td><td><a class="el" href="ucsdet_8h.html" title="C API: Charset Detection API. ">ucsdet.h</a> </td><td>C API </td></tr>
<tr>
<td>Unicode Text Compression </td><td><a class="el" href="ucnv_8h.html" title="C API: Character conversion. ">ucnv.h</a><br />
(encoding name "SCSU" or "BOCU-1") </td><td>C API </td></tr>
<tr>
<td>Locales </td><td><a class="el" href="uloc_8h.html" title="C API: Locale ID functionality similar to C++ class Locale. ">uloc.h</a>, <a class="el" href="ulocale_8h.html" title="C API: Locale ID functionality similar to C++ class Locale. ">ulocale.h</a>, <a class="el" href="ulocbuilder_8h.html" title="C API: Builder API for Locale. ">ulocbuilder.h</a> </td><td><a class="el" href="classicu_1_1Locale.html" title="A Locale object represents a specific geographical, political, or cultural region. ">icu::Locale</a>, <a class="el" href="classicu_1_1LocaleBuilder.html" title="LocaleBuilder is used to build instances of Locale from values configured by the setters. ">icu::LocaleBuilder</a>, <a class="el" href="classicu_1_1LocaleMatcher.html" title="Immutable class that picks the best match between a user's desired locales and an application's suppo...">icu::LocaleMatcher</a> </td></tr>
<tr>
<td>Resource Bundles </td><td><a class="el" href="ures_8h.html" title="C API: Resource Bundle. ">ures.h</a> </td><td><a class="el" href="classicu_1_1ResourceBundle.html" title="A class representing a collection of resource information pertaining to a given locale. ">icu::ResourceBundle</a> </td></tr>
<tr>
<td>Normalization </td><td><a class="el" href="unorm2_8h.html" title="C API: New API for Unicode Normalization. ">unorm2.h</a> </td><td><a class="el" href="classicu_1_1Normalizer2.html" title="Unicode normalization functionality for standard Unicode normalization or for using custom mapping ta...">icu::Normalizer2</a> </td></tr>
<tr>
<td>Calendars and Time Zones </td><td><a class="el" href="ucal_8h.html" title="C API: Calendar. ">ucal.h</a> </td><td><a class="el" href="classicu_1_1Calendar.html" title="Calendar is an abstract base class for converting between a UDate object and a set of integer fields ...">icu::Calendar</a>, <a class="el" href="classicu_1_1TimeZone.html" title="TimeZone represents a time zone offset, and also figures out daylight savings. ">icu::TimeZone</a> </td></tr>
<tr>
<td>Date and Time Formatting </td><td><a class="el" href="udat_8h.html" title="C API: DateFormat. ">udat.h</a> </td><td><a class="el" href="classicu_1_1DateFormat.html" title="DateFormat is an abstract class for a family of classes that convert dates and times from their inter...">icu::DateFormat</a> </td></tr>
<tr>
<td>Message Formatting </td><td><a class="el" href="umsg_8h.html" title="C API: MessageFormat. ">umsg.h</a> </td><td><a class="el" href="classicu_1_1MessageFormat.html">icu::MessageFormat</a> </td></tr>
<tr>
<td>List Formatting </td><td><a class="el" href="ulistformatter_8h.html" title="C API: Format a list in a locale-appropriate way. ">ulistformatter.h</a> </td><td><a class="el" href="classicu_1_1ListFormatter.html" title="An immutable class for formatting a list, using data from CLDR (or supplied separately). ">icu::ListFormatter</a> </td></tr>
<tr>
<td>Number Formatting<br />
(includes currency and unit formatting) </td><td><a class="el" href="unumberformatter_8h.html" title="C API: Localized number formatting; not recommended for C++. ">unumberformatter.h</a>, <a class="el" href="unum_8h.html" title="C API: Compatibility APIs for number formatting. ">unum.h</a>, <a class="el" href="usimplenumberformatter_8h.html" title="C API: Simple number formatting focused on low memory and code size. ">usimplenumberformatter.h</a> </td><td><a class="el" href="classicu_1_1number_1_1NumberFormatter.html" title="See the main description in numberformatter.h for documentation and examples. ">icu::number::NumberFormatter</a> (ICU 60+) or <a class="el" href="classicu_1_1NumberFormat.html">icu::NumberFormat</a> (older versions)<br />
<a class="el" href="classicu_1_1number_1_1SimpleNumberFormatter.html" title="A special NumberFormatter focused on smaller binary size and memory use. ">icu::number::SimpleNumberFormatter</a> (ICU 73+) </td></tr>
<tr>
<td>Number Range Formatting<br />
(includes currency and unit ranges) </td><td><a class="el" href="unumberrangeformatter_8h.html" title="C API: Localized number range formatting. ">unumberrangeformatter.h</a> </td><td><a class="el" href="classicu_1_1number_1_1NumberRangeFormatter.html" title="See the main description in numberrangeformatter.h for documentation and examples. ">icu::number::NumberRangeFormatter</a> </td></tr>
<tr>
<td>Number Spellout<br />
(Rule Based Number Formatting) </td><td><a class="el" href="unum_8h.html" title="C API: Compatibility APIs for number formatting. ">unum.h</a><br />
(use UNUM_SPELLOUT) </td><td><a class="el" href="classicu_1_1RuleBasedNumberFormat.html" title="The RuleBasedNumberFormat class formats numbers according to a set of rules. ">icu::RuleBasedNumberFormat</a> </td></tr>
<tr>
<td>Text Transformation<br />
(Transliteration) </td><td><a class="el" href="utrans_8h.html" title="C API: Transliterator. ">utrans.h</a> </td><td><a class="el" href="classicu_1_1Transliterator.html" title="Transliterator is an abstract class that transliterates text from one format to another. ">icu::Transliterator</a> </td></tr>
<tr>
<td>Bidirectional Algorithm </td><td><a class="el" href="ubidi_8h.html" title=" C API: Bidi algorithm ">ubidi.h</a>, <a class="el" href="ubiditransform_8h.html" title="C API: Bidi Transformations. ">ubiditransform.h</a> </td><td>C API </td></tr>
<tr>
<td>Arabic Shaping </td><td><a class="el" href="ushape_8h.html" title="C API: Arabic shaping. ">ushape.h</a> </td><td>C API </td></tr>
<tr>
<td>Collation </td><td><a class="el" href="ucol_8h.html" title="C API: Collator. ">ucol.h</a> </td><td><a class="el" href="classicu_1_1Collator.html" title="The Collator class performs locale-sensitive string comparison. ">icu::Collator</a> </td></tr>
<tr>
<td>String Searching </td><td><a class="el" href="usearch_8h.html" title="C API: StringSearch. ">usearch.h</a> </td><td><a class="el" href="classicu_1_1StringSearch.html" title="StringSearch is a SearchIterator that provides language-sensitive text searching based on the compari...">icu::StringSearch</a> </td></tr>
<tr>
<td>Index Characters/<br />
Bucketing for Sorted Lists </td><td>(no C API) </td><td><a class="el" href="classicu_1_1AlphabeticIndex.html" title="AlphabeticIndex supports the creation of a UI index appropriate for a given language. ">icu::AlphabeticIndex</a> </td></tr>
<tr>
<td>Text Boundary Analysis<br />
(Break Iteration) </td><td><a class="el" href="ubrk_8h.html" title="C API: BreakIterator. ">ubrk.h</a> </td><td><a class="el" href="classicu_1_1BreakIterator.html" title="The BreakIterator class implements methods for finding the location of boundaries in text...">icu::BreakIterator</a> </td></tr>
<tr>
<td>Regular Expressions </td><td><a class="el" href="uregex_8h.html" title="C API: Regular Expressions. ">uregex.h</a> </td><td><a class="el" href="classicu_1_1RegexPattern.html" title="Class RegexPattern represents a compiled regular expression. ">icu::RegexPattern</a>, <a class="el" href="classicu_1_1RegexMatcher.html" title="class RegexMatcher bundles together a regular expression pattern and input text to which the expressi...">icu::RegexMatcher</a> </td></tr>
<tr>
<td>StringPrep </td><td><a class="el" href="usprep_8h.html" title="C API: Implements the StringPrep algorithm. ">usprep.h</a> </td><td>C API </td></tr>
<tr>
<td>International Domain Names in Applications:<br />
UTS #46 in C/C++, IDNA2003 only via C API </td><td><a class="el" href="uidna_8h.html" title="C API: Internationalizing Domain Names in Applications (IDNA) ">uidna.h</a> </td><td><a class="el" href="idna_8h.html" title="C++ API: Internationalizing Domain Names in Applications (IDNA) ">idna.h</a> </td></tr>
<tr>
<td>Identifier Spoofing & Confusability </td><td><a class="el" href="uspoof_8h.html" title="C API: Unicode Security and Spoofing Detection. ">uspoof.h</a> </td><td>C API </td></tr>
<tr>
<td>Universal Time Scale </td><td><a class="el" href="utmscale_8h.html" title=" C API: Universal Time Scale ">utmscale.h</a> </td><td>C API </td></tr>
<tr>
<td>Paragraph Layout / Complex Text Layout </td><td><a class="el" href="playout_8h.html" title="C API for paragraph layout. ">playout.h</a> </td><td><a class="el" href="classicu_1_1ParagraphLayout.html" title="ParagraphLayout. ">icu::ParagraphLayout</a> </td></tr>
<tr>
<td>ICU I/O </td><td><a class="el" href="ustdio_8h.html" title=" C API: Unicode stdio-like API ">ustdio.h</a> </td><td><a class="el" href="ustream_8h.html" title="C++ API: Unicode iostream like API. ">ustream.h</a> </td></tr>
</table>
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