| Defined in header <locale> | ||||
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Converts the calendar date and time stored in the std::tm object pointed to by t into a character string, according to the format string [fmtbeg, fmtend). The format string is the same as used by std::srtftime, but each format specifier is processed by an individual call to do_put(), which can be customized by extending this facet.
1) Steps through the character sequence
[fmtbeg, fmtend), examining the characters. Every character that is not a part of a format sequence is written to the output iterator out immediately. To identify format sequences, this function narrows the next character c in [fmtbeg, fmtend) as if by std::ctype<char_type>(str.getloc()).narrow(c,0) and if it equals '%', the next one or two characters are compared to the list of format sequences recognized by std::strftime plus any additional implementation-defined formats supported by this locale. For each valid format sequence, a call to do_put(out, str, fill, t, format, modifier) is made, where format is the format sequence character, and modifier is the optional format sequence modifier ('E' or 'O'). A value of '\0' is used if the modifier is absent. 2) Calls the
do_put member function of the most derived class. 3) Converts the calendar date and time stored in the
std::tm object pointed to by t into a character string, according to the format conversion sequence formed by concatenating '%', the value of modifier if not '\0', and the value of format. The format is interpreted the same way as the function std::strftime, except that the formats that are described as locale-dependent are defined by this locale, and additional format specifiers may be supported (the fill argument is provided for these implementation-defined format specifiers to use). The string is written to the output iterator out.Parameters
| out | - | output iterator where the result of the conversion is written | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| str | - | a stream object that this function uses to obtain locale facets when needed, e.g. std::ctype to narrow characters | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| t | - | pointer to the std::tm object from which the date/time values are obtained | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| fmtbeg | - | pointer to the first character of a sequence of char_type characters specifying the conversion format The format string consists of zero or more conversion specifiers and ordinary characters (except
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| fmtend | - | pointer one past the last character of a sequence of char_type characters specifying the conversion format | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| fill | - | fill character (usually space) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| format | - | the character that names a conversion specifier | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| modifier | - | the optional modifier that may appear between % and the conversion specifier | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Return value
Iterator pointing one past the last character that was produced .
Notes
No error handling is provided.
The fill character is provided for those implementation-defined format specifiers and for the user-defined overrides of do_put() that use padding and filling logic. Such implementations typically make use of the formatting flags from str.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | #include <iostream>#include <sstream>#include <iomanip>#include <ctime> void try_time_put(const std::tm* t, const std::string& fmt){ std::cout.imbue(std::locale()); std::cout << "In the locale '" << std::cout.getloc().name() << "' : '"; std::use_facet<std::time_put<char>>(std::cout.getloc()).put( std::ostreambuf_iterator<char>(std::cout), std::cout, ' ', t, &fmt[0], &fmt[0] + fmt.size()); std::cout << "'\n";} int main(){ std::time_t t = std::time(NULL); std::tm tm = *std::localtime(&t); std::string fmt = "%c"; std::cout << "Using the format string '" << fmt << "' to format the time: " << std::ctime(&t) << '\n'; std::locale::global(std::locale("de_DE.utf8")); try_time_put(&tm, fmt); std::locale::global(std::locale("el_GR.utf8")); try_time_put(&tm, fmt); std::locale::global(std::locale("ja_JP.utf8")); try_time_put(&tm, fmt);} |
Output:
1 2 3 4 5 | Using the format string '%c' to format the time: Mon Feb 11 22:58:50 2013 In the locale 'de_DE.utf8' : 'Mo 11 Feb 2013 23:02:38 EST'In the locale 'el_GR.utf8' : 'Δευ 11 Φεβ 2013 11:02:38 μμ EST'In the locale 'ja_JP.utf8' : '2013年02月11日 23時02分38秒' |
See also
| (C++11) | formats and outputs a date/time value according to the specified format (function template) |
| [virtual] (C++11) | extracts date/time components from input stream, according to the specified format (virtual protected member function of std::time_get) |
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