std::time_get::get_weekday
Defined in header <locale> | | |
|---|---|---|
public: iter_type get_weekday( iter_type beg, iter_type end, std::ios_base& str, std::ios_base::iostate& err, std::tm* t) const; | (1) | |
protected: virtual iter_type do_get_weekday( iter_type beg, iter_type end, std::ios_base& str, std::ios_base::iostate& err, std::tm* t) const; | (2) | |
1%29公共成员函数，调用受保护的虚拟成员函数。do_get_weekday最派生的类。
2%29从序列中读取连续字符。[beg, end)并使用此区域设置所期望的工作日默认格式，解析工作日名称%28(可能缩写为%29)，该格式与"%a"函数所使用的std::get_time，，，time_get::get，以及POSIX函数strptime()
如果它找到缩写的名称，后面跟着对全名有效的字符，它将继续读取，直到它使用全名的所有字符或找到一个期望的字符%27T。在这种情况下，即使前几个字符是有效的缩写，解析也会失败。
解析的工作日存储在std::tm场域t->tm_wday...
如果在读取有效的工作日名称之前到达了结束迭代器，则函数设置。std::ios_base::eofbit在err如果遇到解析错误，则函数将std::ios_base::failbit在err...
参数
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 |
返回值
中的最后一个字符[beg, end)这被确认为有效周名的一部分。
注记
这个函数通常不区分大小写.
如果遇到解析错误，则此函数的大多数实现将离开。*t未经修改。
例
二次
#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(
std::istreambuf_iterator<char>(str),
std::istreambuf_iterator<char>(),
str, err, &t
);
str.setstate(err);
if(str) {
std::cout << "Successfully parsed, weekday number is " << t.tm_wday;
if(ret != std::istreambuf_iterator<char>()) {
std::cout << " Remaining content: ";
std::copy(ret, std::istreambuf_iterator<char>(),
std::ostreambuf_iterator<char>(std::cout));
} else {
std::cout << " the input was fully consumed";
}
} else {
std::cout << "Parse failed. Unparsed string: ";
std::copy(ret, std::istreambuf_iterator<char>(),
std::ostreambuf_iterator<char>(std::cout));
}
std::cout << '\n';
}
int main()
{
std::locale::global(std::locale("lt_LT.utf8"));
try_get_wday("Št");
try_get_wday("Šeštadienis");
std::locale::global(std::locale("en_US.utf8"));
try_get_wday("SATELLITE");
std::locale::global(std::locale("ja_JP.utf8"));
try_get_wday("土曜日");
}二次
产出：
二次
Parsing the weekday out of 'Št' in the locale lt_LT.utf8
Successfully parsed, weekday number is 6 the input was fully consumed
Parsing the weekday out of 'Šeštadienis' 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 '土曜日' in the locale ja_JP.utf8
Successfully parsed, weekday number is 6 the input was fully consumed二次
另见
get_time (C++11) | parses a date/time value of specified format (function template) |
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