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| Regular expressions library(C++11) | |||||||||||||||||||||||||
| Formatting library(C++20) | |||||||||||||||||||||||||
| Null-terminated sequence utilities | |||||||||||||||||||||||||
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| Member functions | ||||
time_get::get_timetime_get::do_get_time | ||||
Defined in header <locale> | ||
public: iter_type get_time( iter_type beg, iter_type end,std::ios_base& str, | (1) | |
protected: virtual iter_type do_get_time( iter_type beg, iter_type end,std::ios_base& str, | (2) | |
do_get_time of the most derived class.[beg, end) and parses out the time value following the same rules as the format specifier"%H:%M:%S" as used by the functionsstd::get_time,time_get::get, and the POSIX functionstrptime().Contents |
| 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 thestd::tm object that will hold the result of this function call |
Iterator pointing one past the last character in[beg, end) that was recognized as a part of a valid date.
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.
#include <iostream>#include <iterator>#include <locale>#include <sstream> void try_get_time(conststd::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.utf8Hours: 21, Minutes: 40, Seconds: 11Parsing the time out of '21-40-11' in the locale ru_RU.utf8Parse failed. Unparsed string: -40-11Parsing the time out of '21時37分58秒' in the locale ja_JP.utf8Hours: 21, Minutes: 37, Seconds: 58
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 end iterator | setseofbit if a valid time has not been read |
| LWG 461 | C++98 | do_get_time needed to parse localized time representation | parses with"%H:%M:%S" format |
(C++11) | parses a date/time value of specified format (function template)[edit] |
