std::time_get::get_time,std::time_get::do_get_time(3)

NAME
std::time_get::get_time,std::time_get::do_get_time - std::time_get::get_time,std::time_get::do_get_time

Synopsis
   Defined in header <locale>
   public:
   iter_type get_time( iter_type beg, iter_type end, std::ios_base& str, (1)
                       std::ios_base::iostate& err, std::tm* t ) const;
   protected:
   virtual iter_type do_get_time( iter_type beg, iter_type end, std::ios_base& (2)
   str,
                        std::ios_base::iostate& err, std::tm* t ) const;
   1) Public member function, calls the protected virtual member function do_get_time
   of the most derived class.
   2) Reads successive characters from the sequence [beg, end) and parses out the time
   value following the same rules as the format specifier "%H:%M:%S" as used by the
   functions std::get_time, time_get::get, and the POSIX function strptime().
   The parsed time is stored in the corresponding fields of the std::tm structure
   pointed to by the argument t.
   If the end iterator is reached before a valid time is read, the function sets
   std::ios_base::eofbit in err. If a parsing error is encountered, the function sets
   std::ios_base::failbit in err.

Parameters
   beg - iterator designating the start of the sequence to parse
   end - one past the end iterator for the sequence to parse
   str - a stream object that this function uses to obtain locale facets when needed,
         e.g. std::ctype to skip whitespace
   err - stream error flags object that is modified by this function to indicate errors
   t - pointer to the std::tm object that will hold the result of this function call

Return value
   Iterator pointing one past the last character in [beg, end) that was recognized as a
   part of a valid date.

Notes
   For the alphabetic components of the default time format (if any), this function is
   usually case-insensitive.
   If a parsing error is encountered, most implementations of this function leave *t
   unmodified.

Example
// Run this code
 #include <iostream>
 #include <iterator>
 #include <locale>
 #include <sstream>
 void try_get_time(const std::string& s)
 {
     std::cout << "Parsing the time out of '" << s
               << "' in the locale " << std::locale().name() << '\n';
     std::istringstream str(s);
     std::ios_base::iostate err = std::ios_base::goodbit;
     std::tm t;
     std::time_get<char> const& facet =
         std::use_facet<std::time_get<char>>(str.getloc());
     std::istreambuf_iterator<char> ret =
         facet.get_time({str}, {}, str, err, &t);
     str.setstate(err);
     if (str)
     {
         std::cout << "Hours: " << t.tm_hour << ", "
                      "Minutes: " << t.tm_min << ", "
                      "Seconds: " << t.tm_sec << '\n';
     }
     else
     {
         std::cout << "Parse failed. Unparsed string: ";
         std::copy(ret, {}, std::ostreambuf_iterator<char>(std::cout));
         std::cout << '\n';
     }
 }
 int main()
 {
     std::locale::global(std::locale("ru_RU.utf8"));
     try_get_time("21:40:11");
     try_get_time("21-40-11");
     std::locale::global(std::locale("ja_JP.utf8"));
     try_get_time("21時37分58秒");
 }

Output:
 Parsing the time out of '21:40:11' in the locale ru_RU.utf8
 Hours: 21, Minutes: 40, Seconds: 11
 Parsing the time out of '21-40-11' in the locale ru_RU.utf8
 Parse failed. Unparsed string: -40-11
 Parsing the time out of '21時37分58秒' in the locale ja_JP.utf8
 Hours: 21, Minutes: 37, Seconds: 58
   Defect reports
   The following behavior-changing defect reports were applied retroactively to
   previously published C++ standards.
     DR Applied to Behavior as published Correct behavior
   LWG 248 C++98 eofbit was not set upon reaching the sets eofbit if a valid time
                      end iterator has not been read
   LWG 461 C++98 do_get_time needed to parse localized parses with "%H:%M:%S"
                      time representation format

See also
   get_time parses a date/time value of specified format
   (C++11) (function template)