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## Class template partial_date

boost::date_time::partial_date — Generates a date by applying the year to the given month and day.

## Synopsis

    template<typename date_type>
    class partial_date
      :  : public boost::date_time::year_based_generator< date_type >
    {
    public:
      // types
      typedef date_type::calendar_type    calendar_type;
      typedef calendar_type::day_type     day_type;
      typedef calendar_type::month_type   month_type;
      typedef calendar_type::year_type    year_type;
      typedef date_type::duration_type    duration_type;
      typedef duration_type::duration_rep duration_rep;

      // construct/copy/destruct
      partial_date(day_type, month_type);
      partial_date(duration_rep);

      // public member functions
      date_type get_date(year_type) const;
      date_type operator()(year_type) const;
      bool operator==(const partial_date &) const;
      bool operator<(const partial_date &) const;
      month_type month() const;
      day_type day() const;
      virtual std::string to_string() const;
    };

## Description

Example usage:

        partial_date pd(1, Jan);
        partial_date pd2(70);
        date d = pd.get_date(2002); //2002-Jan-01
        date d2 = pd2.get_date(2002); //2002-Mar-10

### `partial_date` construct/copy/destruct

1.     partial_date(day_type d, month_type m);

2.     partial_date(duration_rep days);

   Allowable values range from 1 to 366. 1=Jan1, 366=Dec31. If argument exceeds range, partial_date will be created with closest in-range value. 60 will always be Feb29, if get_date() is called with a non-leap year an exception will be thrown

### `partial_date` public member functions

1.     date_type get_date(year_type y) const;

   Will throw an 'invalid_argument' exception if a partial_date object, instantiated with Feb-29, has get_date called with a non-leap year. Example:

        partial_date pd(29, Feb);
        pd.get_date(2003); // throws invalid_argument exception
        pg.get_date(2000); // returns 2000-2-29

2.     date_type operator()(year_type y) const;

3.     bool operator==(const partial_date & rhs) const;

4.     bool operator<(const partial_date & rhs) const;

5.     month_type month() const;

6.     day_type day() const;

7.     virtual std::string to_string() const;

   Returns string formatted with up to 3 digits: Jan-01 == "0" Feb-29 == "58" Dec-31 == "365"

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