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Difference between revisions of "cpp/locale/LC categories"

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{{title|<small>LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME</small>}}
 
{{title|<small>LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME</small>}}
 
{{cpp/locale/navbar}}
 
{{cpp/locale/navbar}}
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{{ddcl list begin}}
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{{dcl begin}}
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{{ddcl list header|clocale}}
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{{dcl header|clocale}}
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{{ddcl list item |
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{{dcl|
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#define LC_ALL      /*implementation defined*/
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#define LC_ALL      /* implementation defined */
 
}}
 
}}
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{{ddcl list item |
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{{dcl|
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#define LC_COLLATE  /*implementation defined*/
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#define LC_COLLATE  /* implementation defined */
 
}}
 
}}
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{{ddcl list item |
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{{dcl|
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#define LC_CTYPE    /*implementation defined*/
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#define LC_CTYPE    /* implementation defined */
 
}}
 
}}
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{{ddcl list item |
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{{dcl|
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#define LC_MONETARY /*implementation defined*/
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#define LC_MONETARY /* implementation defined */
 
}}
 
}}
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{{ddcl list item |
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{{dcl|
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#define LC_NUMERIC  /*implementation defined*/
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#define LC_NUMERIC  /* implementation defined */
 
}}
 
}}
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{{ddcl list item |
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{{dcl|
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#define LC_TIME    /*implementation defined*/
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#define LC_TIME    /* implementation defined */
 
}}
 
}}
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{{ddcl list end}}
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{{dcl end}}
  
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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 {{c|std::setlocale}}.
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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 {{lc|std::setlocale}}.
  
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{{dcl list begin}}
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{{dsc begin}}
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{{dcl list hitem | Constant | Explanation}}
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{{dsc hitem|Constant|Explanation}}
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{{dcl list item | {{tt|LC_ALL}}     | selects the entire C locale}}
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{{dsc|{{tt|LC_ALL}}|selects the entire C locale}}
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{{dcl list item | {{tt|LC_COLLATE}} | selects the collation category of the C locale}}
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{{dsc|{{tt|LC_COLLATE}}|selects the collation category of the C locale}}
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{{dcl list item | {{tt|LC_CTYPE}}   | selects the character classification category of the C locale}}
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{{dsc|{{tt|LC_CTYPE}}|selects the character classification category of the C locale}}
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{{dcl list item | {{tt|LC_MONETARY}} | selects the monetary formatting category of the C locale}}
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{{dsc|{{tt|LC_MONETARY}}|selects the monetary formatting category of the C locale}}
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{{dcl list item | {{tt|LC_NUMERIC}} | selects the numeric formatting category of the C locale}}
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{{dsc|{{tt|LC_NUMERIC}}|selects the numeric formatting category of the C locale}}
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{{dcl list item | {{tt|LC_TIME}}     | selects the time formatting category of the C locale}}
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{{dsc|{{tt|LC_TIME}}|selects the time formatting category of the C locale}}
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{{dcl list end}}
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{{dsc end}}
  
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Additional macro constants, with names that begin with {{tt|LC_}} followed by at least one uppercase letter, may be defined in {{tt|<clocale>}}. For example, the POSIX specification requires LC_MESSAGES and the GNU C library additionally defines LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, and LC_IDENTIFICATION.
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Additional macro constants, with names that begin with {{tt|LC_}} followed by at least one uppercase letter, may be defined in {{header|clocale}}. For example, the POSIX specification requires {{tt|LC_MESSAGES}} (which controls {{lc|std::perror}} and {{lc|std::strerror}}), ISO/IEC 30112:2014 ([https://www.open-std.org/JTC1/SC35/WG5/docs/30112d10.pdf 2014 draft]) additionally defines {{tt|LC_IDENTIFICATION}}, {{tt|LC_XLITERATE}}, {{tt|LC_NAME}}, {{tt|LC_ADDRESS}}, {{tt|LC_TELEPHONE}}, {{tt|LC_PAPER}}, {{tt|LC_MEASUREMENT}}, and {{tt|LC_KEYBOARD}}, which are supported by the GNU C library (except for {{tt|LC_XLITERATE}}).
  
 
===Example===
 
===Example===
 
{{example
 
{{example
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|
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|code=
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| code=
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#include <cstdio>
+
 
#include <clocale>
 
#include <clocale>
 +
#include <cstdio>
 
#include <ctime>
 
#include <ctime>
 
#include <cwchar>
 
#include <cwchar>
 +
 
int main()
 
int main()
 
{
 
{
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     std::setlocale(LC_ALL, "en_US.UTF-8"); // the C locale will be the UTF-8 enabled English
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     // the C locale will be the UTF-8 enabled English:
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     std::setlocale(LC_NUMERIC, "de_DE");   // decimal dot will be German
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     std::setlocale(LC_ALL, "en_US.UTF-8");
−
     std::setlocale(LC_TIME, "ja_JP");     // date/time formatting will be Japanese
+
 
 +
    // 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];
 
     wchar_t str[100];
−
     std::time_t t = std::time(NULL);
+
     std::time_t t = std::time(nullptr);
 
     std::wcsftime(str, 100, L"%A %c", std::localtime(&t));
 
     std::wcsftime(str, 100, L"%A %c", std::localtime(&t));
 
     std::wprintf(L"Number: %.2f\nDate: %Ls\n", 3.14, str);
 
     std::wprintf(L"Number: %.2f\nDate: %Ls\n", 3.14, str);
 
}
 
}
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| output=
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|output=
 
Number: 3,14
 
Number: 3,14
−
Date: 月曜日 2011年12月19日 18時04分40秒
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Date: 日曜日 2022年11月06日 17時55分10秒
 
}}
 
}}
  
 
===See also===
 
===See also===
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{{dcl list begin}}
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{{dsc begin}}
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{{dcl list template | cpp/locale/dcl list setlocale}}
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{{dsc inc|cpp/locale/dsc setlocale}}
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{{dcl list template | cpp/locale/dcl list locale}}
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{{dsc inc|cpp/locale/dsc locale}}
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{{dcl list end}}
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{{dsc see c|c/locale/LC_categories|locale categories|nomono=true}}
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{{dsc end}}
 +
 
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 10:12, 13 September 2023

 
C++
 
Localization library
 
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 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).

[edit] Example

Run this code
#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: 3,14
Date: 日曜日 2022年11月06日 17時55分10秒

[edit] See also

 gets and sets the current C locale
(function) [edit]
set of polymorphic facets that encapsulate cultural differences
(class) [edit]
C documentation for locale categories
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