time_get.cpp

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// NOTE: A SunPro bug requires time.h preceed locale. PR #26255
#include <ctime>      // for struct tm
#include <locale>     // for locale, time_get
#include <sstream>    // for stringstream
#include <iostream>   // for cout, endl
 
 
// Print out a tm struct value in one atomic operation
std::ostream& operator<< (std::ostream &os, const std::tm &t)
{
    std::stringstream strm;
 
    strm << "Daylight Savings = "   << t.tm_isdst
         << "\nDay of year      = " << t.tm_yday
         << "\nDay of week      = " << t.tm_wday
         << "\nYear             = " << t.tm_year
         << "\nMonth            = " << t.tm_mon
         << "\nDay of month     = " << t.tm_mday
         << "\nHour             = " << t.tm_hour
         << "\nMinute           = " << t.tm_min
         << "\nSecond           = " << t.tm_sec
         << '\n';
 
    // guard for thread safety and output synchronization
    const std::ostream::sentry guard (os);
 
    if (guard)
        os.rdbuf ()->sputn (strm.str ().c_str (), strm.str ().size ());
    else
        os.setstate (os.failbit);
 
    return os;
}
 
 
int main ()
{
    typedef std::istreambuf_iterator<char, std::char_traits<char> > Iter;
 
    // time struct to parse date into
    static std::tm timeb;  // zero initialized
 
    // Unused, required by time_get
    std::ios_base::iostate state;
 
    // Stream object to read from
    std::istringstream ins ("");
 
    // Iterators into the stream object
    Iter begin (ins);
    Iter end;
 
    const std::locale loc ("C");
 
    // Get a reference to the time_get facet in locale loc.
    const std::time_get<char, Iter> &tg =
        std::use_facet<std::time_get<char, Iter> >(loc);
 
    // Display time_base::dateorder value.
    std::cout << "time_base::dateorder == " << tg.date_order () << ".\n";
  
    // Insert date string into stream.
    ins.str ("04/07/69");
 
    // get_date from the stream and output tm contents.
    tg.get_date (begin, end, ins, state, &timeb);
    std::cout << "Date: Apr 7 1969\n" << timeb << std::endl;
 
    // Insert weekday string into stream.
    ins.str ("Monday");
 
    // get_weekday from the stream and output tm contents.
    tg.get_weekday (begin, end, ins, state, &timeb);
    std::cout << "Weekday: Monday\n" << timeb << std::endl;
  
    // Insert time string into stream.
    ins.str ("06:47:32");
 
    // get_time from the stream and output tm contents.
    tg.get_time (begin, end, ins, state, &timeb);
    std::cout << "Time: 06:47:32\n" << timeb << std::endl;
 
    return 0;
}