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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) and the GNU C library additionally defines LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, and LC_IDENTIFICATION.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #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"); // decimal dot will be German std::setlocale(LC_TIME, "ja_JP"); // 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:
1 2 | Number: 3,14Date: 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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