Swiftdiff options
Diffstat (limited to '3rdParty/Boost/src/boost/date_time/date.hpp')
| -rw-r--r-- | 3rdParty/Boost/src/boost/date_time/date.hpp | 77 |
1 files changed, 44 insertions, 33 deletions
diff --git a/3rdParty/Boost/src/boost/date_time/date.hpp b/3rdParty/Boost/src/boost/date_time/date.hpp index beab047..1056fb6 100644 --- a/3rdParty/Boost/src/boost/date_time/date.hpp +++ b/3rdParty/Boost/src/boost/date_time/date.hpp @@ -2,43 +2,43 @@ #define DATE_TIME_DATE_HPP___ /* Copyright (c) 2002,2003 CrystalClear Software, Inc. - * Use, modification and distribution is subject to the + * Use, modification and distribution is subject to the * Boost Software License, Version 1.0. (See accompanying * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) * Author: Jeff Garland, Bart Garst - * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ + * $Date: 2010-01-10 14:17:23 -0500 (Sun, 10 Jan 2010) $ */ -#include "boost/date_time/year_month_day.hpp" -#include "boost/date_time/special_defs.hpp" -#include "boost/operators.hpp" +#include <boost/operators.hpp> +#include <boost/date_time/year_month_day.hpp> +#include <boost/date_time/special_defs.hpp> namespace boost { namespace date_time { //!Representation of timepoint at the one day level resolution. - /*! + /*! The date template represents an interface shell for a date class that is based on a year-month-day system such as the gregorian or iso systems. It provides basic operations to enable calculation - and comparisons. + and comparisons. <b>Theory</b> - This date representation fundamentally departs from the C tm struct + This date representation fundamentally departs from the C tm struct approach. The goal for this type is to provide efficient date operations (add, subtract) and storage (minimize space to represent) in a concrete class. Thus, the date uses a count internally to - represent a particular date. The calendar parameter defines + represent a particular date. The calendar parameter defines the policies for converting the the year-month-day and internal counted form here. Applications that need to perform heavy formatting of the same date repeatedly will perform better by using the year-month-day representation. - + Internally the date uses a day number to represent the date. - This is a monotonic time representation. This representation + This is a monotonic time representation. This representation allows for fast comparison as well as simplifying - the creation of writing numeric operations. Essentially, the + the creation of writing numeric operations. Essentially, the internal day number is like adjusted julian day. The adjustment is determined by the Epoch date which is represented as day 1 of the calendar. Day 0 is reserved for negative infinity so that @@ -48,11 +48,11 @@ namespace date_time { day representations. */ - - template<class T, class calendar, class duration_type_> - class date : private - boost::less_than_comparable<T - , boost::equality_comparable<T + + template<class T, class calendar, class duration_type_> + class date : private + boost::less_than_comparable<T + , boost::equality_comparable<T > > { public: @@ -67,26 +67,26 @@ namespace date_time { typedef typename calendar::date_rep_type date_rep_type; typedef typename calendar::date_int_type date_int_type; typedef typename calendar::day_of_week_type day_of_week_type; - date(year_type y, month_type m, day_type d) + date(year_type y, month_type m, day_type d) : days_(calendar::day_number(ymd_type(y, m, d))) {} - date(const ymd_type& ymd) + date(const ymd_type& ymd) : days_(calendar::day_number(ymd)) - {} + {} //let the compiler write copy, assignment, and destructor year_type year() const { - ymd_type ymd = calendar::from_day_number(days_); + ymd_type ymd = calendar::from_day_number(days_); return ymd.year; } month_type month() const { - ymd_type ymd = calendar::from_day_number(days_); + ymd_type ymd = calendar::from_day_number(days_); return ymd.month; } day_type day() const { - ymd_type ymd = calendar::from_day_number(days_); + ymd_type ymd = calendar::from_day_number(days_); return ymd.day; } day_of_week_type day_of_week() const @@ -138,10 +138,21 @@ namespace date_time { } duration_type operator-(const date_type& d) const { - date_rep_type val = date_rep_type(days_) - date_rep_type(d.days_); - return duration_type(val.as_number()); + if (!this->is_special() && !d.is_special()) + { + // The duration underlying type may be wider than the date underlying type. + // Thus we calculate the difference in terms of two durations from some common fixed base date. + typedef typename duration_type::duration_rep_type duration_rep_type; + return duration_type(static_cast< duration_rep_type >(days_) - static_cast< duration_rep_type >(d.days_)); + } + else + { + // In this case the difference will be a special value, too + date_rep_type val = date_rep_type(days_) - date_rep_type(d.days_); + return duration_type(val.as_special()); + } } - + date_type operator-(const duration_type& dd) const { if(dd.is_special()) @@ -155,10 +166,10 @@ namespace date_time { *this = *this - dd; return date_type(days_); } - date_rep_type day_count() const + date_rep_type day_count() const { return days_; - }; + } //allow internal access from operators date_type operator+(const duration_type& dd) const { @@ -170,25 +181,25 @@ namespace date_time { } date_type operator+=(const duration_type& dd) { - *this = *this + dd; + *this = *this + dd; return date_type(days_); } //see reference protected: - /*! This is a private constructor which allows for the creation of new - dates. It is not exposed to users since that would require class + /*! This is a private constructor which allows for the creation of new + dates. It is not exposed to users since that would require class users to understand the inner workings of the date class. */ explicit date(date_int_type days) : days_(days) {}; explicit date(date_rep_type days) : days_(days.as_number()) {}; date_int_type days_; - + }; - + } } // namespace date_time |