ICU 76.1 76.1
ICU 76.1

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)


Module List

Module NameCC++
Basic Types and Constantsutypes.hutypes.h
Strings and Character Iterationustring.h, utf8.h, utf16.h, icu::StringPiece, UText, UCharIterator, icu::ByteSinkicu::UnicodeString, icu::CharacterIterator, icu::Appendable, icu::StringPiece,icu::ByteSink
Unicode Character
Properties and Names
uchar.h, uscript.hC API
Sets of Unicode Code Points and Stringsuset.hicu::UnicodeSet
Maps from Unicode Code Points to Integer Valuesucptrie.h, umutablecptrie.hC API
Maps from Strings to Integer Values(no C API)icu::BytesTrie, icu::UCharsTrie
Codepage Conversionucnv.h, ucnvsel.hC API
Codepage Detectionucsdet.hC API
Unicode Text Compressionucnv.h
(encoding name "SCSU" or "BOCU-1")
C API
Locales uloc.h, ulocale.h, ulocbuilder.hicu::Locale, icu::LocaleBuilder, icu::LocaleMatcher
Resource Bundlesures.hicu::ResourceBundle
Normalizationunorm2.hicu::Normalizer2
Calendars and Time Zonesucal.hicu::Calendar, icu::TimeZone
Date and Time Formattingudat.hicu::DateFormat
Relative Date and Time Formattingureldatefmt.hicu::RelativeDateTimeFormatter
Message Formattingumsg.hicu::MessageFormat
Message Formatting 2
(technology preview)
(no C API)icu::message2::MessageFormatter
List Formattingulistformatter.hicu::ListFormatter
Number Formatting
(includes currency and unit formatting)
unumberformatter.h, unum.h, usimplenumberformatter.hicu::number::NumberFormatter (ICU 60+) or icu::NumberFormat (older versions)
icu::number::SimpleNumberFormatter (ICU 73+)
Number Range Formatting
(includes currency and unit ranges)
unumberrangeformatter.hicu::number::NumberRangeFormatter
Number Spellout
(Rule Based Number Formatting)
unum.h
(use UNUM_SPELLOUT)
icu::RuleBasedNumberFormat
Text Transformation
(Transliteration)
utrans.hicu::Transliterator
Bidirectional Algorithmubidi.h, ubiditransform.hC API
Arabic Shapingushape.hC API
Collationucol.hicu::Collator
String Searchingusearch.hicu::StringSearch
Index Characters/
Bucketing for Sorted Lists
(no C API)icu::AlphabeticIndex
Text Boundary Analysis
(Break Iteration)
ubrk.hicu::BreakIterator
Regular Expressionsuregex.hicu::RegexPattern, icu::RegexMatcher
StringPrepusprep.hC API
International Domain Names in Applications:
UTS #46 in C/C++, IDNA2003 only via C API
uidna.hidna.h
Identifier Spoofing & Confusabilityuspoof.hC API
Universal Time Scaleutmscale.hC API
Paragraph Layout / Complex Text Layoutplayout.hicu::ParagraphLayout
ICU I/Oustdio.hustream.h

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