如何初始化 Boost 日期？

发布于 2024-08-22 10:10:48 字数 766 浏览 8 评论 0原文

页面

http://www.boost。 org/doc/libs/1_42_0/doc/html/date_time/gregorian.html#date_construction

解释了您可以初始化使用这种调用提高日期：

date d(2002, Jan, 10);

但是当我尝试这样做时，编译器不知道“Jan”。

它确实适用于：

date d(2002, 1, 10);

编辑：

#include <boost/date_time/gregorian/gregorian.hpp>
..
{
    using namespace boost::gregorian;

    date limit_date(2010,Apr,1);
    date fake_date(2010,2,1);

    if (fake_date>limit_date)
    {
        ...
    }
}

原文

The page

http://www.boost.org/doc/libs/1_42_0/doc/html/date_time/gregorian.html#date_construction

explains that you can initialize a Boost date with this kind of call:

date d(2002, Jan, 10);

But when I try that, the compiler doesn't know 'Jan'.

It does work with:

date d(2002, 1, 10);

EDIT:

#include <boost/date_time/gregorian/gregorian.hpp>
..
{
    using namespace boost::gregorian;

    date limit_date(2010,Apr,1);
    date fake_date(2010,2,1);

    if (fake_date>limit_date)
    {
        ...
    }
}

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稀香 2024-08-29 10:10:48

也许您错过了包含所需的命名空间？我不能确切地说是哪一个，因为你没有发布完整的代码，但我可以假设，它可能是这样的：

using namespace boost::gregorian;

或

using namespace boost::date_time;

更新：

Jan 的辩护：

namespace boost {
namespace date_time {

  //! An enumeration of weekday names
  enum weekdays {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday};

  //! Simple enum to allow for nice programming with Jan, Feb, etc
  enum months_of_year {Jan=1,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,NotAMonth,NumMonths};

} } //namespace date_time

Maybe you missed including of needed namespace? I can't say which one exactly, because you didn't post whole code, but I can suppose, that it can be something like:

using namespace boost::gregorian;

using namespace boost::date_time;

Update:

Defenition of Jan:

namespace boost {
namespace date_time {

  //! An enumeration of weekday names
  enum weekdays {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday};

  //! Simple enum to allow for nice programming with Jan, Feb, etc
  enum months_of_year {Jan=1,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,NotAMonth,NumMonths};

} } //namespace date_time

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