| Home | Libraries | People | FAQ | More

## Class template base_time

boost::date_time::base_time —

Representation of a precise moment in time, including the date.

## Synopsis

    template<typename T, typename time_system>
    class base_time {
    public:
      // types
      typedef T                               time_type;
      typedef time_system::time_rep_type      time_rep_type;
      typedef time_system::date_type          date_type;
      typedef time_system::date_duration_type date_duration_type;
      typedef time_system::time_duration_type time_duration_type;

      // construct/copy/destruct
      base_time(const date_type &, const time_duration_type &,
                dst_flags = not_dst);
      base_time(const time_rep_type &);

      // public member functions
      date_type date() const;
      time_duration_type time_of_day() const;
      std::string zone_name() const;
      bool is_not_a_date_time() const;
      bool is_infinity() const;
      bool is_pos_infinity() const;
      bool is_neg_infinity() const;
      bool operator==(const time_type &) const;
      bool operator<(const time_type &) const;
      time_duration_type operator-(const time_type &) const;
      time_type operator+(const date_duration_type &) const;
      time_type operator+=(const date_duration_type &) ;
      time_type operator-(const date_duration_type &) const;
      time_type operator-=(const date_duration_type &) ;
      time_type operator+(const time_duration_type &) const;
      time_type operator+=(const time_duration_type &) ;
      time_type operator-(const time_duration_type &) const;
      time_type operator-=(const time_duration_type &) ;
    };

## Description

This class is a skeleton for the interface of a temporal type with a resolution that is higher than a day. It is intended that this class be the base class and that the actual time class be derived using the BN pattern. In this way, the derived class can make decisions such as 'should there be a default constructor' and what should it set its value to, should there be optional constructors say allowing only an time_durations that generate a time from a clock,etc. So, in fact multiple time types can be created for a time_system with different construction policies, and all of them can perform basic operations by only writing a copy constructor. Finally, compiler errors are also shorter.

The real behavior of the time class is provided by the time_system template parameter. This class must provide all the logic for addition, subtraction, as well as define all the interface types.

### `base_time` construct/copy/destruct

1.     base_time(const date_type & day, const time_duration_type & td,
                 dst_flags dst = not_dst);

2.     base_time(const time_rep_type & rhs);

### `base_time` public member functions

1.     date_type date() const;

2.     time_duration_type time_of_day() const;

3.     std::string zone_name() const;

4.     bool is_not_a_date_time() const;

   check to see if date is not a value

5.     bool is_infinity() const;

   check to see if date is one of the infinity values

6.     bool is_pos_infinity() const;

   check to see if date is greater than all possible dates

7.     bool is_neg_infinity() const;

   check to see if date is greater than all possible dates

8.     bool operator==(const time_type & rhs) const;

   Equality operator -- others generated by boost::equality_comparable.

9.     bool operator<(const time_type & rhs) const;

   Equality operator -- others generated by boost::less_than_comparable.

10.     time_duration_type operator-(const time_type & rhs) const;

    difference between two times

11.     time_type operator+(const date_duration_type & dd) const;

    add date durations

12.     time_type operator+=(const date_duration_type & dd) ;

13.     time_type operator-(const date_duration_type & dd) const;

    subtract date durations

14.     time_type operator-=(const date_duration_type & dd) ;

15.     time_type operator+(const time_duration_type & td) const;

    add time durations

16.     time_type operator+=(const time_duration_type & td) ;

17.     time_type operator-(const time_duration_type & rhs) const;

    subtract time durations

18.     time_type operator-=(const time_duration_type & td) ;

| Copyright © 2001-2004 CrystalClear Software, Inc