我正在使用 boost::gregorian 执行日期计算。我想按照示例使用 add_month(当前版本为 1.63 http://www.boost.org/doc/libs/1_63_0/doc/html/date_time/examples.html)
/* Simple program that uses the gregorian calendar to progress by exactly
* one month, irregardless of how many days are in that month.
*
* This method can be used as an alternative to iterators
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
int main()
{
using namespace boost::gregorian;
date d = day_clock::local_day();
add_month mf(1);
date d2 = d + mf.get_offset(d);
std::cout << "Today is: " << to_simple_string(d) << ".\n"
<< "One month from today will be: " << to_simple_string(d2)
<< std::endl;
return 0;
}
然而，这给出了错误信息
month.cpp: In function `int main()':
month.cpp:33:5: error: `add_month' was not declared in this scope
add_month mf(1);
^
month.cpp:35:19: error: `mf' was not declared in this scope
date d2 = d + mf.get_offset(d);
^
最佳答案
的确如此。该示例已过时。事实上，我不记得看到过这个功能，所以它可能早就过时了。
我推荐以下方法:
/* Simple program that uses the gregorian calendar to progress by exactly
* one month, irregardless of how many days are in that month.
*
* This method can be used as an alternative to iterators
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
int main()
{
using namespace boost::gregorian;
date d = day_clock::local_day(),
prev = d - months(1),
next = d + months(1);
std::cout << "Today is: " << to_simple_string(d) << ".\n"
<< "One month before today was: " << to_simple_string(prev) << "\n"
<< "One month from today will be: " << to_simple_string(next) << "\n";
}
哪个打印(对我来说):
Today is: 2017-Mar-23.
One month before today was: 2017-Feb-23
One month from today will be: 2017-Apr-23
关于c++ - add_month 从 boost::gregorian 中删除？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42978102/