std::time_get::get_weekday, std::time_get::do_get_weekday
| Defined in header <locale>
|
||
| public: iter_type get_weekday( iter_type beg, iter_type end, std::ios_base& str, |
(1) | |
| protected: virtual iter_type do_get_weekday( iter_type beg, iter_type end, std::ios_base& str, |
(2) | |
do_get_weekday of the most derived class.[beg, end) and parses out the weekday name (possibly abbreviated), using the default format for weekdays expected by this locale, which is the same format as "%a" as used by the functions std::get_time, time_get::get, and the POSIX function strptime()If it finds abbreviated name, followed by the characters that are valid for the full name, it continues reading until it consumes all the characters for the full name or finds a character that isn't expected, in which case parsing fails even if the first few characters were a valid abbreviation.
The parsed weekday is stored in the std::tm field t->tm_wday.
If the end iterator is reached before a valid weekday name 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 or std::collate to compare strings |
| 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 weekname.
Notes
This function is usually case-insensitive.
If a parsing error is encountered, most implementations of this function leave *t unmodified.
Example
#include <iostream> #include <locale> #include <sstream> #include <iterator> void try_get_wday(const std::string& s) { std::cout << "Parsing the weekday 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::istreambuf_iterator<char> ret = std::use_facet<std::time_get<char>>(str.getloc()).get_weekday( {str}, {}, str, err, &t ); str.setstate(err); std::istreambuf_iterator<char> last{}; if(str) { std::cout << "Successfully parsed, weekday number is " << t.tm_wday; if(ret != last) { std::cout << " Remaining content: "; std::copy(ret, last, std::ostreambuf_iterator<char>(std::cout)); } else { std::cout << " the input was fully consumed"; } } else { std::cout << "Parse failed. Unparsed string: "; std::copy(ret, last, std::ostreambuf_iterator<char>(std::cout)); } std::cout << '\n'; } int main() { std::locale::global(std::locale("lt_LT.utf8")); try_get_wday("t"); try_get_wday("etadienis"); std::locale::global(std::locale("en_US.utf8")); try_get_wday("SATELLITE"); std::locale::global(std::locale("ja_JP.utf8")); try_get_wday(""); }
Output:
Parsing the weekday out of 't' in the locale lt_LT.utf8 Successfully parsed, weekday number is 6 the input was fully consumed Parsing the weekday out of 'etadienis' in the locale lt_LT.utf8 Successfully parsed, weekday number is 6 the input was fully consumed Parsing the weekday out of 'SATELLITE' in the locale en_US.utf8 Successfully parsed, weekday number is 6 Remaining content: ELLITE Parsing the weekday out of '' in the locale ja_JP.utf8 Successfully parsed, weekday number is 6 the input was fully consumed
See also
| (C++11) |
parses a date/time value of specified format (function template) |