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std::time_get

From cppreference.com
< cpp‎ | locale
 
 
 
 
Defined in header <locale>
template<

    class CharT,
    class InputIt = std::istreambuf_iterator<CharT>

> class time_get;

Class template std::time_get encapsulates date and time parsing rules. The I/O manipulator std::get_time uses the std::time_get facet of the I/O stream's locale to convert text input to a std::tm object.

cpp/locale/time basecpp/locale/locale/facetstd-time get-inheritance.svg
About this image

Inheritance diagram

Contents

[edit] Type requirements

-
InputIt must meet the requirements of LegacyInputIterator.

[edit] Specializations

Two standalone (locale-independent) full specializations and two partial specializations are provided by the standard library:

Defined in header <locale>
std::time_get<char> parses narrow string representations of date and time
std::time_get<wchar_t> parses wide string representations of date and time
std::time_get<char, InputIt> parses narrow string representations of date and time using custom input iterator
std::time_get<wchar_t, InputIt> parses wide string representations of date and time using custom input iterator

In addition, every locale object constructed in a C++ program implements its own (locale-specific) versions of these specializations.

[edit] Member types

Member type Definition
char_type CharT
iter_type InputIt

[edit] Member functions

constructs a new time_get facet
(public member function)
destructs a time_get facet
(protected member function)
invokes do_date_order
(public member function) [edit]
invokes do_get_time
(public member function) [edit]
invokes do_get_date
(public member function) [edit]
invokes do_get_weekday
(public member function) [edit]
invokes do_get_monthname
(public member function) [edit]
invokes do_get_year
(public member function) [edit]
(C++11)
invokes do_get
(public member function) [edit]

[edit] Member objects

static std::locale::id id
id of the locale
(public member object)

[edit] Protected member functions

obtains preferred ordering of day, month, and year
(virtual protected member function) [edit]
[virtual]
extracts hours, minutes, and seconds from input stream
(virtual protected member function) [edit]
[virtual]
extracts month, day, and year from input stream
(virtual protected member function) [edit]
extracts the name of a day of the week from input stream
(virtual protected member function) [edit]
extacts a month name from input stream
(virtual protected member function) [edit]
[virtual]
extracts a year from input stream
(virtual protected member function) [edit]
[virtual] (C++11)
extracts date/time components from input stream, according to the specified format
(virtual protected member function) [edit]

Inherited from std::time_base

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

[edit] Example

note: choose clang to observe the output. libstdc++ does not correctly implement the %b specifier: bug 78714

#include <iostream>
#include <sstream>
#include <locale>
#include <iomanip>
 
int main()
{
    std::tm t = {};
    std::istringstream ss("2011-Februar-18 23:12:34");
    ss.imbue(std::locale("de_DE.utf-8"));
    ss >> std::get_time(&t, "%Y-%b-%d %H:%M:%S");
    if (ss.fail()) {
        std::cout << "Parse failed\n";
    } else {
        std::cout << std::put_time(&t, "%c") << '\n';
    }
}

Possible output:

Sun Feb 18 23:12:34 2011

[edit] See also

formats contents of struct std::tm for output as character sequence
(class template) [edit]
(C++11)
parses a date/time value of specified format
(function template) [edit]