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# Localization library

From cppreference.com
< cpp

The locale facility includes internationalization support for character classification and string collation, numeric, monetary, and date/time formatting and parsing, and message retrieval. Locale settings control the behavior of stream I/O, regular expression library, and other components of the C++ standard library.

### [edit] Locales

Defined in header `<locale>`
##### Locales and facets
locale | set of polymorphic facets that encapsulate cultural differences (class) [edit]
use_facet | obtains a facet from a locale (function template) [edit]
has_facet | checks if a locale implements a specific facet (function template) [edit]
##### Character classification
isspace(std::locale) | checks if a character is classified as whitespace by a locale (function template) [edit]
isblank(std::locale) (C++11) | checks if a character is classified as a blank character by a locale (function template) [edit]
iscntrl(std::locale) | checks if a character is classified as a control character by a locale (function template) [edit]
isupper(std::locale) | checks if a character is classified as uppercase by a locale (function template) [edit]
islower(std::locale) | checks if a character is classified as lowercase by a locale (function template) [edit]
isalpha(std::locale) | checks if a character is classified as alphabetic by a locale (function template) [edit]
isdigit(std::locale) | checks if a character is classified as a digit by a locale (function template) [edit]
ispunct(std::locale) | checks if a character is classified as punctuation by a locale (function template) [edit]
isxdigit(std::locale) | checks if a character is classified as a hexadecimal digit by a locale (function template) [edit]
isalnum(std::locale) | checks if a character is classified as alphanumeric by a locale (function template) [edit]
isprint(std::locale) | checks if a character is classified as printable by a locale (function template) [edit]
isgraph(std::locale) | checks if a character is classfied as graphical by a locale (function template) [edit]
##### Character conversions
toupper(std::locale) | converts a character to uppercase using the ctype facet of a locale (function template) [edit]
tolower(std::locale) | converts a character to lowercase using the ctype facet of a locale (function template) [edit]
##### String and stream conversions
wstring_convert (C++11)(deprecated in C++17) | performs conversions between a wide string and a byte string (class template) [edit]
wbuffer_convert (C++11)(deprecated in C++17) | performs conversion between a byte stream buffer and a wide stream buffer (class template) [edit]
##### Facet category base classes
ctype_base | defines character classification categories (class) [edit]
codecvt_base | defines character conversion errors (class) [edit]
messages_base | defines messages catalog type (class) [edit]
time_base | defines date format constants (class) [edit]
money_base | defines monetary formatting patterns (class) [edit]
##### Facet categories
ctype | defines character classification tables (class template) [edit]
ctype<char> | specialization of std::ctype for type char (class template specialization) [edit]
codecvt | converts between character encodings, including UTF-8, UTF-16, UTF-32 (class template) [edit]
collate | defines lexicographical comparison and hashing of strings (class template) [edit]
messages | implements retrieval of strings from message catalogs (class template) [edit]
time_get | parses time/date values from an input character sequence into struct std::tm (class template) [edit]
time_put | formats contents of struct std::tm for output as character sequence (class template) [edit]
num_get | parses numeric values from an input character sequence (class template) [edit]
num_put | formats numeric values for output as character sequence (class template) [edit]
numpunct | defines numeric punctuation rules (class template) [edit]
money_get | parses and constructs a monetary value from an input character sequence (class template) [edit]
money_put | formats a monetary value for output as a character sequence (class template) [edit]
moneypunct | defines monetary formatting parameters used by std::money_get and std::money_put (class template) [edit]
##### Locale-specific facet categories
ctype_byname | represents the system-supplied std::ctype for the named locale (class template) [edit]
codecvt_byname | represents the system-supplied std::codecvt for the named locale (class template) [edit]
messages_byname | represents the system-supplied std::messages for the named locale (class template) [edit]
collate_byname | represents the system-supplied std::collate for the named locale (class template) [edit]
time_get_byname | represents the system-supplied std::time_get for the named locale (class template) [edit]
time_put_byname | represents the system-supplied std::time_put for the named locale (class template) [edit]
numpunct_byname | represents the system-supplied std::numpunct for the named locale (class template) [edit]
moneypunct_byname | represents the system-supplied std::moneypunct for the named locale (class template) [edit]

### [edit] Locale-independent unicode conversion facets

Defined in header `<codecvt>`
codecvt_utf8 (C++11)(deprecated in C++17) | converts between UTF-8 and UCS2/UCS4 (class template) [edit]
codecvt_utf16 (C++11)(deprecated in C++17) | converts between UTF-16 and UCS2/UCS4 (class template) [edit]
codecvt_utf8_utf16 (C++11)(deprecated in C++17) | converts between UTF-8 and UTF-16 (class template) [edit]
codecvt_mode (C++11)(deprecated in C++17) | tags to alter behavior of the standard codecvt facets (enum) [edit]

### [edit] C library locales

Defined in header `<clocale>`
setlocale | gets and sets the current C locale (function) [edit]
LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME | locale categories for std::setlocale (macro constant) [edit]
localeconv | queries numeric and monetary formatting details of the current locale (function) [edit]
lconv | formatting details, returned by std::localeconv (class) [edit]

### [edit] See also

C documentation for Localization support

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