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ICU 78.3

# API Reference Usage

### C++ Programmers:

Use Class Hierarchy or Alphabetical List or Compound List to find the class you are interested in. For example, to find BreakIterator, you can go to the Alphabetical List, 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.

### C Programmers:

Use Module List or File Members to find a list of all the functions and constants. For example, to find BreakIterator functions you would click on File List, 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 ubrk_next(), then click first on File Members, then use your browser Find dialog to search for "ubrk_next()".

### API References for Previous Releases

The API References for each release of ICU are also available as a zip file from the ICU download page.

## Architecture (User's Guide)

- Introduction
- Internationalization
- Locale Model, Multithreading, Error Handling, etc.
- Conversion

## Module List

Module Name | C | C++
Basic Types and Constants | utypes.h | utypes.h
Strings and Character Iteration | ustring.h, utf8.h, utf16.h, icu::StringPiece, UText, UCharIterator, icu::ByteSink | icu::UnicodeString, utfiterator.h (ICU 78+), icu::CharacterIterator, icu::Appendable, icu::StringPiece, icu::ByteSink
Unicode Character Properties and Names | uchar.h, uscript.h | C API
Sets of Unicode Code Points and Strings | uset.h | icu::UnicodeSet
Maps from Unicode Code Points to Integer Values | ucptrie.h, umutablecptrie.h | C API
Maps from Strings to Integer Values | (no C API) | icu::BytesTrie, icu::UCharsTrie
Codepage Conversion | ucnv.h, ucnvsel.h | C API
Codepage Detection | ucsdet.h | C API
Unicode Text Compression | ucnv.h (encoding name "SCSU" or "BOCU-1") | C API
Locales | uloc.h, ulocale.h, ulocbuilder.h | icu::Locale, icu::LocaleBuilder, icu::LocaleMatcher
Resource Bundles | ures.h | icu::ResourceBundle
Normalization | unorm2.h | icu::Normalizer2
Calendars and Time Zones | ucal.h | icu::Calendar, icu::TimeZone
Date and Time Formatting | udat.h | icu::DateFormat
Relative Date and Time Formatting | ureldatefmt.h | icu::RelativeDateTimeFormatter
Message Formatting | umsg.h | icu::MessageFormat
Message Formatting 2 (technology preview) | (no C API) | icu::message2::MessageFormatter
List Formatting | ulistformatter.h | icu::ListFormatter
Number Formatting (includes currency and unit formatting) | unumberformatter.h, unum.h, usimplenumberformatter.h | icu::number::NumberFormatter (ICU 60+) or icu::NumberFormat (older versions) icu::number::SimpleNumberFormatter (ICU 73+)
Number Range Formatting (includes currency and unit ranges) | unumberrangeformatter.h | icu::number::NumberRangeFormatter
Number Spellout (Rule Based Number Formatting) | unum.h (use UNUM_SPELLOUT) | icu::RuleBasedNumberFormat
Text Transformation (Transliteration) | utrans.h | icu::Transliterator
Bidirectional Algorithm | ubidi.h, ubiditransform.h | C API
Arabic Shaping | ushape.h | C API
Collation | ucol.h | icu::Collator
String Searching | usearch.h | icu::StringSearch
Index Characters/ Bucketing for Sorted Lists | (no C API) | icu::AlphabeticIndex
Text Boundary Analysis (Break Iteration) | ubrk.h | icu::BreakIterator
Regular Expressions | uregex.h | icu::RegexPattern, icu::RegexMatcher
StringPrep | usprep.h | C API
International Domain Names in Applications: UTS #46 in C/C++, IDNA2003 only via C API | uidna.h | idna.h
Identifier Spoofing & Confusability | uspoof.h | C API
Universal Time Scale | utmscale.h | C API
Paragraph Layout / Complex Text Layout | playout.h | icu::ParagraphLayout
ICU I/O | ustdio.h | ustream.h

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