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## Class template month_functor

boost::date_time::month_functor — Provides calculation to find next nth month given a date.

## Synopsis

    // In header: <boost/date_time/adjust_functors.hpp>

    template<typename date_type>
    class month_functor {
    public:
      // types
      typedef date_type::duration_type duration_type;
      typedef date_type::calendar_type cal_type;
      typedef cal_type::ymd_type       ymd_type;
      typedef cal_type::day_type       day_type;

      // construct/copy/destruct
      month_functor(int);

      // public member functions
      duration_type get_offset(const date_type &) const;
      duration_type get_neg_offset(const date_type &) const;
    };

## Description

This adjustment function provides the logic for 'month-based' advancement on a ymd based calendar. The policy it uses to handle the non existant end of month days is to back up to the last day of the month. Also, if the starting date is the last day of a month, this functor will attempt to adjust to the end of the month.

### `month_functor` public construct/copy/destruct

1.     month_functor(int f);

### `month_functor` public member functions

1.     duration_type get_offset(const date_type & d) const;

2.     duration_type get_neg_offset(const date_type & d) const;

   Returns a negative duration_type.