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## Class template time_duration

boost::date_time::time_duration — Represents some amount of elapsed time measure to a given resolution.

## Synopsis

    template<typename T, typename rep_type>
    class time_duration {
    public:
      // types
      typedef T                                 duration_type;
      typedef rep_type                          traits_type;
      typedef rep_type::day_type                day_type;
      typedef rep_type::hour_type               hour_type;
      typedef rep_type::min_type                min_type;
      typedef rep_type::sec_type                sec_type;
      typedef rep_type::fractional_seconds_type fractional_seconds_type;
      typedef rep_type::tick_type               tick_type;
      typedef rep_type::impl_type               impl_type;

      // construct/copy/destruct
      time_duration();
      time_duration(hour_type, min_type, sec_type = 0,
                    fractional_seconds_type = 0);
      time_duration(const time_duration< T, rep_type > &);
      time_duration(special_values);
      time_duration(impl_type);

      // public member functions
      hour_type hours() const;
      min_type minutes() const;
      sec_type seconds() const;
      sec_type total_seconds() const;
      tick_type total_milliseconds() const;
      tick_type total_nanoseconds() const;
      tick_type total_microseconds() const;
      fractional_seconds_type fractional_seconds() const;
      duration_type invert_sign() const;
      bool is_negative() const;
      bool operator<(const time_duration &) const;
      bool operator==(const time_duration &) const;
      duration_type operator-() const;
      duration_type operator-(const duration_type &) const;
      duration_type operator+(const duration_type &) const;
      duration_type operator/(int) const;
      duration_type operator-=(const duration_type &) ;
      duration_type operator+=(const duration_type &) ;
      duration_type operator/=(int) ;
      duration_type operator *(int) const;
      duration_type operator *=(int) ;
      tick_type ticks() const;
      bool is_special() const;
      bool is_pos_infinity() const;
      bool is_neg_infinity() const;
      bool is_not_a_date_time() const;
      impl_type get_rep() const;

      // public static functions
      duration_type unit() ;
      tick_type ticks_per_second() ;
      time_resolutions resolution() ;
      unsigned short num_fractional_digits() ;

      // protected member functions
    };

## Description

This class represents a standard set of capabilities for all counted time durations. Time duration implementations should derive from this class passing their type as the first template parameter. This design allows the subclass duration types to provide custom construction policies or other custom features not provided here.

### `time_duration` construct/copy/destruct

1.     time_duration();

2.     time_duration(hour_type hours, min_type minutes, sec_type seconds = 0,
                     fractional_seconds_type frac_sec = 0);

3.     time_duration(const time_duration< T, rep_type > & other);

4.     time_duration(special_values sv);

5.     time_duration(impl_type in);

### `time_duration` public member functions

1.     hour_type hours() const;

2.     min_type minutes() const;

3.     sec_type seconds() const;

4.     sec_type total_seconds() const;

5.     tick_type total_milliseconds() const;

6.     tick_type total_nanoseconds() const;

7.     tick_type total_microseconds() const;

8.     fractional_seconds_type fractional_seconds() const;

9.     duration_type invert_sign() const;

10.     bool is_negative() const;

11.     bool operator<(const time_duration & rhs) const;

12.     bool operator==(const time_duration & rhs) const;

13.     duration_type operator-() const;

14.     duration_type operator-(const duration_type & d) const;

15.     duration_type operator+(const duration_type & d) const;

16.     duration_type operator/(int divisor) const;

17.     duration_type operator-=(const duration_type & d) ;

18.     duration_type operator+=(const duration_type & d) ;

19.     duration_type operator/=(int divisor) ;

20.     duration_type operator *(int rhs) const;

21.     duration_type operator *=(int divisor) ;

22.     tick_type ticks() const;

23.     bool is_special() const;

24.     bool is_pos_infinity() const;

25.     bool is_neg_infinity() const;

26.     bool is_not_a_date_time() const;

27.     impl_type get_rep() const;

### `time_duration` public static functions

1.     duration_type unit() ;

2.     tick_type ticks_per_second() ;

3.     time_resolutions resolution() ;

4.     unsigned short num_fractional_digits() ;

### `time_duration` protected member functions

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