std::time_put

< cpp‎ | locale

Defined in header `<locale>`
template< class CharT, class OutputIt = std::ostreambuf_iterator<CharT> > class time_put;

Class template std::time_put encapsulates date and time formatting rules. The I/O manipulator std::put_time uses the std::time_put facet of the I/O stream's locale to generate text representation of an std::tm object.

Inheritance diagram

If a std::time_put specialization is not guaranteed to be provided by the standard library (see below), the behaviors of its put() and do_put() are not guaranteed as specified.

Specializations

The standard library is guaranteed to provide the following specializations (they are required to be implemented by any locale object):

Defined in header `<locale>`
std::time_put<char>	creates narrow string representations of date and time
std::time_put<wchar_t>	creates wide string representations of date and time

In addition, the standard library is also 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` facet (public member function)
(destructor)	destructs a `time_put` facet (protected member function)
put	invokes `do_put` (public member function)

Member objects

static std::locale::id id

id of the locale
(public member object)

Protected member functions

do_put

[virtual]

formats date/time and writes to output stream
(virtual protected member function)

Example

#include <iostream>
#include <ctime>
#include <iomanip>
#include <codecvt>
 
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("ja_JP.utf8"));
 
    // this I/O manipulator std::put_time uses std::time_put<wchar_t>
    out << std::put_time(std::localtime(&t), L"%A %c") << '\n';
}

Output:

水曜日 2011年11月09日 12時32分05秒

time_put_byname	represents the system-supplied std::time_put for the named locale (class template)
time_get	parses time/date values from an input character sequence into std::tm (class template)
put_time (C++11)	formats and outputs a date/time value according to the specified format (function template)