Difference between revisions of "cpp/locale/LC categories"
From cppreference.com
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std::setlocale(LC_ALL, "en_US.UTF-8"); // the C locale will be the UTF-8 enabled English | std::setlocale(LC_ALL, "en_US.UTF-8"); // the C locale will be the UTF-8 enabled English | ||
| − | std::setlocale(LC_NUMERIC, "de_DE"); // decimal dot will be German | + | std::setlocale(LC_NUMERIC, "de_DE.UTF-8"); // decimal dot will be German |
| − | std::setlocale(LC_TIME, "ja_JP"); // date/time formatting will be Japanese | + | std::setlocale(LC_TIME, "ja_JP.UTF-8"); // date/time formatting will be Japanese |
wchar_t str[100]; | wchar_t str[100]; | ||
std::time_t t = std::time(nullptr); | std::time_t t = std::time(nullptr); | ||
Revision as of 22:44, 13 October 2017
| Defined in header <clocale>
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| #define LC_ALL /*implementation defined*/ |
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| #define LC_COLLATE /*implementation defined*/ |
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| #define LC_CTYPE /*implementation defined*/ |
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| #define LC_MONETARY /*implementation defined*/ |
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| #define LC_NUMERIC /*implementation defined*/ |
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| #define LC_TIME /*implementation defined*/ |
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Each of the above macro constants expand to integer constant expressions with distinct values that are suitable for use as the first argument of std::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 with LC_ followed by at least one uppercase letter, may be defined in <clocale>. For example, the POSIX specification requires LC_MESSAGES (which controls std::perror and std::strerror), ISO/IEC 30112:2014 (2014 draft) additionally defines LC_IDENTIFICATION, LC_XLITERATE, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_PAPER, LC_MEASUREMENT, and LC_KEYBOARD, which are supported by the GNU C library (except for LC_XLITERATE)
Example
Run this code
#include <cstdio> #include <clocale> #include <ctime> #include <cwchar> int main() { std::setlocale(LC_ALL, "en_US.UTF-8"); // the C locale will be the UTF-8 enabled English std::setlocale(LC_NUMERIC, "de_DE.UTF-8"); // decimal dot will be German std::setlocale(LC_TIME, "ja_JP.UTF-8"); // date/time formatting will be Japanese 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: 3,14 Date: 月曜日 2011年12月19日 18時04分40秒
See also
| gets and sets the current C locale (function) | |
| set of polymorphic facets that encapsulate cultural differences (class) | |
| C documentation for locale categories
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