LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME

#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 of std::setlocale.

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

#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);
}

Number: 3,14
Date: 月曜日 2011年12月19日 18時04分40秒

See also