| Localization library | |||||||||||||||||||||||||
| Regular expressions library(C++11) | |||||||||||||||||||||||||
| Formatting library(C++20) | |||||||||||||||||||||||||
| Null-terminated sequence utilities | |||||||||||||||||||||||||
| Byte strings | |||||||||||||||||||||||||
| Multibyte strings | |||||||||||||||||||||||||
| Wide strings | |||||||||||||||||||||||||
| Primitive numeric conversions | |||||||||||||||||||||||||
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| Text encoding identifications | |||||||||||||||||||||||||
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Defined in header <clocale> | ||
#define LC_ALL /* implementation defined */ | ||
#define LC_COLLATE /* implementation defined */ | ||
#define LC_CTYPE /* implementation defined */ | ||
#define LC_MONETARY /* implementation defined */ | ||
#define LC_NUMERIC /* implementation defined */ | ||
#define LC_TIME /* implementation defined */ | ||
Each of the above macro constants expand to integer constant expressions with distinct values that are suitable for use as the first argument ofstd::setlocale.
| Constant | Explanation |
LC_ALL | selects the entire C locale |
LC_COLLATE | selects the collation category of the C locale |
LC_CTYPE | selects the character classification category of the C locale |
LC_MONETARY | selects the monetary formatting category of the C locale |
LC_NUMERIC | selects the numeric formatting category of the C locale |
LC_TIME | selects the time formatting category of the C locale |
Additional macro constants, with names that begin withLC_ followed by at least one uppercase letter, may be defined in<clocale>. For example, the POSIX specification requiresLC_MESSAGES (which controlsstd::perror andstd::strerror), ISO/IEC 30112:2014 (2014 draft) additionally definesLC_IDENTIFICATION,LC_XLITERATE,LC_NAME,LC_ADDRESS,LC_TELEPHONE,LC_PAPER,LC_MEASUREMENT, andLC_KEYBOARD, which are supported by the GNU C library (except forLC_XLITERATE).
#include <clocale>#include <cstdio>#include <ctime>#include <cwchar> int main(){// the C locale will be the UTF-8 enabled English:std::setlocale(LC_ALL,"en_US.UTF-8"); // decimal dot will be German:std::setlocale(LC_NUMERIC,"de_DE.UTF-8"); // date/time formatting will be Japanese:std::setlocale(LC_TIME,"ja_JP.UTF-8"); wchar_t str[100];std::time_t t=std::time(nullptr);std::wcsftime(str,100, L"%A %c",std::localtime(&t));std::wprintf(L"Number: %.2f\nDate: %Ls\n",3.14, str);}
Output:
Number: 3,14Date: 日曜日 2022年11月06日 17時55分10秒
| gets and sets the current C locale (function)[edit] | |
| set of polymorphic facets that encapsulate cultural differences (class)[edit] | |
C documentation forlocale categories | |
