std:: time_put_byname

From cppreference.com
C++
Localization library
Defined in header <locale>
template <

class CharT,
class OutputIt = std:: ostreambuf_iterator < CharT >

> class time_put_byname : public std:: time_put < CharT, OutputIt > ;

std::time_put_byname is a std::time_put facet which encapsulates time and date formatting rules of the locale specified at its construction.

Specializations

The standard library is guaranteed to provide every specialization that satisfies the following type requirements:

Nested types

Type Definition
char_type CharT
iter_type OutputIt

Member functions

(constructor)
constructs a new time_put_byname facet
(public member function)
(destructor)
destroys a time_put_byname facet
(protected member function)

std::time_put_byname:: time_put_byname

explicit time_put_byname ( const char * name, std:: size_t refs = 0 ) ;
explicit time_put_byname ( const std:: string & name, std:: size_t refs = 0 ) ;
(since C++11)

Constructs a new std::time_put_byname facet for a locale with name .

refs is used for resource management: if refs == 0 , the implementation destroys the facet, when the last std::locale object holding it is destroyed. Otherwise, the object is not destroyed.

Parameters

name - the name of the locale
refs - the number of references that link to the facet

std::time_put_byname:: ~time_put_byname

protected :
~time_put_byname ( ) ;

Destroys the facet.

Inherited from std:: time_put

Data members

Member Description
std::locale::id id [static] the identifier of the facet

Member functions

invokes do_put
(public member function of std::time_put<CharT,OutputIt> )

Protected member functions

[virtual]
formats date/time and writes to output stream
(virtual protected member function of std::time_put<CharT,OutputIt> )

Inherited from std:: time_base

Nested types

Type Definition
dateorder date order enumeration type, defining the values no_order , dmy , mdy , ymd , and ydm

Example

Prints current time using the "C" locale with the time_put facet replaced by various std::time_put_byname facets. The result shown was obtained using the clang compiler.

Run this code 
#include <codecvt>
#include <ctime>
#include <iomanip>
#include <iostream>
 
int main()
{
    std::time_t t = std::time(nullptr);
    std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv(std::cout.rdbuf());
    std::wostream out(&conv);
 
    out.imbue(std::locale(out.getloc(),
                          new std::time_put_byname<wchar_t>("ja_JP.utf8")));
    out << std::put_time(std::localtime(&t), L"%A %c") << '\n';
 
    out.imbue(std::locale(out.getloc(),
                          new std::time_put_byname<wchar_t>("ru_RU.utf8")));
    out << std::put_time(std::localtime(&t), L"%A %c") << '\n';
 
    out.imbue(std::locale(out.getloc(),
                          new std::time_put_byname<wchar_t>("sv_SE.utf8")));
    out << std::put_time(std::localtime(&t), L"%A %c") << '\n';
}

Possible output: 

木曜日 2023年10月05日 19時44分51秒
Четверг Чт 05 окт 2023 19:44:51
torsdag tor  5 okt 2023 19:44:51

See also

formats contents of std::tm for output as character sequence
(class template)
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