std::time_put_byname

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

Localizations library

Locales and facets
locale
use_facet	has_facet
Character classification
isspace isblank (C++11) iscntrl isupper islower isalpha	isdigit ispunct isxdigit isalnum isprint isgraph
Conversions
toupper tolower	wstring_convert (C++11) wbuffer_convert (C++11)
Facet category base classes
ctype_base codecvt_base messages_base	time_base money_base
Facet categories
ctype ctype<char> codecvt collate messages time_get time_put	num_get num_put numpunct money_get money_put moneypunct
Locale-specific facets
ctype_byname codecvt_byname messages_byname collate_byname	time_get_byname time_put_byname numpunct_byname moneypunct_byname
Code conversion facets
codecvt_utf8 (C++11) codecvt_utf16 (C++11)	codecvt_utf8_utf16 (C++11) codecvt_mode (C++11)
C locale
setlocale localeconv lconv	LC_ALLLC_COLLATELC_CTYPELC_MONETARYLC_NUMERICLC_TIME

Defined in header <locale>
template< class CharT, class OutputIterator = std::ostreambuf_iterator<CharT> > class time_put_byname : public std::time_put<CharT, OutputIterator>;

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

Two specializations are provided by the standard library

Defined in header <locale>
std::time_put_byname<char, OutputIterator>	narrow/multibyte time formatting
std::time_put_byname<wchar_t, OutputIterator>	wide string time formatting

Member types

Member type	Definition
char_type	CharT
iter_type	OutputIterator

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)

Protected member functions

do_put [virtual]

formats date/time and writes to output stream (virtual protected member function of std::time_put)

Example

This example prints current time using the "C" locale with the time_put facet replaced by various time_put_byname facets

Run this code

#include <iostream>
#include <ctime>
#include <iomanip>
#include <codecvt>

int main()
{
    std::time_t t = std::time(NULL);
    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")));
    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:

 20120809 214102
þÅÔ×ÅÒÇ þÔ. 09 Á×Ç. 2012 21:41:02
torsdag tor  9 aug 2012 21:41:02

See also

time_put

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