std::time_put_byname

 

C++

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Freestanding and hosted

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Feature test macros (C++20)

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Technical specifications

Symbols index

External libraries

 

Localization library

Locales and facets
Locales
has_facet use_facet	locale
Facet category base classes
ctype_base codecvt_base messages_base	time_base money_base
ctype facets
ctype ctype<char> ctype_byname	codecvt codecvt_byname
numeric facets
num_get num_put	numpunct numpunct_byname
collate facets
collate	collate_byname
time facets
time_get time_put	time_get_byname time_put_byname
monetary facets
money_get money_put	moneypunct moneypunct_byname
messages facets
messages	messages_byname

Character classification and conversion
Character classification
isspace isblank (C++11) iscntrl	isupper islower isalpha	ispunct isdigit isxdigit	isalnum isprint isgraph

Character conversions

toupper

tolower

String and stream conversions

wstring_convert (C++11/17/26*)

wbuffer_convert (C++11/17/26*)

Text encoding identifications

text_encoding (C++26)

Unicode conversion facets

codecvt_utf8 (C++11/17/26*)

codecvt_utf16 (C++11/17/26*)

codecvt_utf8_utf16 (C++11/17/26*)

codecvt_mode (C++11/17/26*)

C library locales
LC_ALLLC_COLLATELC_CTYPELC_MONETARYLC_NUMERICLC_TIME	setlocale localeconv lconv

 

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:

• CharT is one of char and wchar_t, and
• OutputIt must meet the requirements of LegacyOutputIterator.

Member types

Member 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

Member objects

Member name	Type
id (static)	std::locale::id

Member functions

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

Protected member functions

do_put [virtual]

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

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

time_put

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