std::time_get::do_get_monthname
STD：时间[医]GET：：GET[医]月份名称，STD：：时间[医]得到：：做[医]弄到[医]月名
| Defined in header | | |
|---|---|---|
| public: iter_type get_monthname( 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_monthname( 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_monthname最派生的类。
2%29从序列中读取连续字符。[beg, end)并解析月份名称%28(可能缩写为%29)，使用此区域设置所期望的月份名称的默认格式，该格式与"%b"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。
解析的月份存储在std::tm场域t->tm_mon...
如果在读取有效的月份名称之前到达了结束迭代器，则函数将设置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)它被确认为有效月份名称的一部分。
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>
#include <ctime>
void try_get_mon(const std::string& s)
{
std::cout << "Parsing the month 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_monthname(
std::istreambuf_iterator<char>(str),
std::istreambuf_iterator<char>(),
str, err, &t
str.setstate(err
if(str) {
std::cout << "Successfully parsed, month number is " << t.tm_mon;
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("ja_JP.utf8")
try_get_mon("2月"
std::locale::global(std::locale("th_TH.utf8")
try_get_mon("กุมภาพันธ์"
std::locale::global(std::locale("el_GR.utf8")
try_get_mon("Φεβ"
try_get_mon("Φεβρουάριος"
std::locale::global(std::locale("en_US.utf8")
try_get_mon("Febrile"
}
二次
产出：
二次
Parsing the month out of '2月' in the locale ja_JP.utf8
Successfully parsed, month number is 1. The input was fully consumed
Parsing the month out of 'กุมภาพันธ์' in the locale th_TH.utf8
Successfully parsed, month number is 1. The input was fully consumed
Parsing the month out of 'Φεβ' in the locale el_GR.utf8
Successfully parsed, month number is 1. The input was fully consumed
Parsing the month out of 'Φεβρουάριος' in the locale el_GR.utf8
Successfully parsed, month number is 1. The input was fully consumed
Parsing the month out of 'Febrile' in the locale en_US.utf8
Parse failed. Unparsed string: ile
二次
另见
| get_time (C++11) | parses a date/time value of specified format (function template) |
|---|
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