Hi,

The documentation for Boost.Date_Time iterators says that "Date iterators are a model of Bidirectional Iterator".

However, I am not able to use them in some STL algorithms because of the lack of a required nested type.

The following simplified example does not compile:

#include <boost/date_time/gregorian/gregorian.hpp>

#include <algorithm>

void main()

{

using namespace boost::gregorian;

date v[5];

std::copy_n( month_iterator( date(2015,06,25) ), 5, v );

}

On VS2013 fails with error

'difference_type' : is not a member of 'boost::date_time::date_itr<boost::date_time::month_functor<boost::gregorian::greg_durations_config::date_type>,boost::gregorian::date>'

Compilation on gcc and clang fails with a similar error complaining about the lack of 'difference_type'.

Isn't a nested difference_type a requirement of BidirectionalIterator?

Am I using these date iterators incorrectly?

Regards