std::time_get::get_time, std::time_get::do_get_time
From cppreference.com
| Defined in header <locale>
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| public: iter_type get_time( iter_type beg, iter_type end, std::ios_base& str, |
(1) | |
| protected: virtual iter_type get_time( iter_type beg, iter_type end, std::ios_base& str, |
(2) | |
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 | '%X' | (until C++11) |
| "%H:%M:%S" | (since C++11) |
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 value 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 <locale> #include <sstream> #include <iterator> 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::istreambuf_iterator<char> ret = std::use_facet<std::time_get<char>>(str.getloc()).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("213758"); }
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 '213758' in the locale ja_JP.utf8 Hours: 21 Minutes: 37 Seconds: 58
See also
| (C++11) |
parses a date/time value of specified format (function template) |