...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::date_time::base_time — Representation of a precise moment in time, including the date.
// In header: <boost/date_time/time.hpp> 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(special_values); base_time(const time_rep_type &); // public member functions date_type date() const; time_duration_type time_of_day() const; std::string zone_name(bool = false) const; std::string zone_abbrev(bool = false) const; std::string zone_as_posix_string() const; bool is_not_a_date_time() const; bool is_infinity() const; bool is_pos_infinity() const; bool is_neg_infinity() const; bool is_special() 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 &); };
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
public member functionsdate_type date() const;
time_duration_type time_of_day() const;
std::string zone_name(bool = false) const;
Optional bool parameter will return time zone as an offset (ie "+07:00"). Empty string is returned for classes that do not use a time_zone
std::string zone_abbrev(bool = false) const;
Optional bool parameter will return time zone as an offset (ie "+07:00"). Empty string is returned for classes that do not use a time_zone
std::string zone_as_posix_string() const;An empty string is returned for classes that do not use a time_zone.
bool is_not_a_date_time() const;check to see if date is not a value
bool is_infinity() const;check to see if date is one of the infinity values
bool is_pos_infinity() const;check to see if date is greater than all possible dates
bool is_neg_infinity() const;check to see if date is greater than all possible dates
bool is_special() const;check to see if time is a special value
bool operator==(const time_type & rhs) const;Equality operator -- others generated by boost::equality_comparable.
bool operator<(const time_type & rhs) const;Equality operator -- others generated by boost::less_than_comparable.
time_duration_type operator-(const time_type & rhs) const;difference between two times
time_type operator+(const date_duration_type & dd) const;add date durations
time_type operator+=(const date_duration_type & dd);
time_type operator-(const date_duration_type & dd) const;subtract date durations
time_type operator-=(const date_duration_type & dd);
time_type operator+(const time_duration_type & td) const;add time durations
time_type operator+=(const time_duration_type & td);
time_type operator-(const time_duration_type & rhs) const;subtract time durations
time_type operator-=(const time_duration_type & td);