date_time/gregorian/greg_duration.hpp

0001 #ifndef GREG_DURATION_HPP___
0002 #define GREG_DURATION_HPP___
0003
0004 /* Copyright (c) 2002,2003, 2020 CrystalClear Software, Inc.
0005  * Use, modification and distribution is subject to the
0006  * Boost Software License, Version 1.0. (See accompanying
0007  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
0008  * Author: Jeff Garland, Bart Garst
0009  * $Date$
0010  */
0011
0012 #include <boost/date_time/compiler_config.hpp>
0013 #include <boost/date_time/date_duration.hpp>
0014 #include <boost/date_time/int_adapter.hpp>
0015 #include <boost/date_time/special_defs.hpp>
0016
0017 namespace boost {
0018 namespace gregorian {
0019
0020   //!An internal date representation that includes infinities, not a date
0021   typedef boost::date_time::duration_traits_adapted date_duration_rep;
0022
0023   //! Durations in days for gregorian system
0024   /*! \ingroup date_basics
0025    */
0026   class BOOST_SYMBOL_VISIBLE date_duration :
0027     public boost::date_time::date_duration< date_duration_rep >
0028   {
0029     typedef boost::date_time::date_duration< date_duration_rep > base_type;
0030
0031   public:
0032     typedef base_type::duration_rep duration_rep;
0033
0034     //! Construct from a day count
0035     BOOST_CXX14_CONSTEXPR explicit
0036     date_duration(duration_rep day_count = 0) : base_type(day_count) {}
0037
0038     //! construct from special_values
0039     BOOST_CXX14_CONSTEXPR
0040     date_duration(date_time::special_values sv) : base_type(sv) {}
0041
0042     //! Construct from another date_duration
0043     BOOST_CXX14_CONSTEXPR
0044     date_duration(const base_type& other) : base_type(other)
0045     {}
0046
0047     //  Relational operators
0048     //  NOTE: Because of date_time::date_duration< T > design choice we don't use Boost.Operators here,
0049     //  because we need the class to be a direct base. Either lose EBO, or define operators by hand.
0050     //  The latter is more effecient.
0051     BOOST_CXX14_CONSTEXPR bool operator== (const date_duration& rhs) const
0052     {
0053       return base_type::operator== (rhs);
0054     }
0055     BOOST_CXX14_CONSTEXPR bool operator!= (const date_duration& rhs) const
0056     {
0057       return !operator== (rhs);
0058     }
0059     BOOST_CXX14_CONSTEXPR bool operator< (const date_duration& rhs) const
0060     {
0061       return base_type::operator< (rhs);
0062     }
0063     BOOST_CXX14_CONSTEXPR bool operator> (const date_duration& rhs) const
0064     {
0065       return !(base_type::operator< (rhs) || base_type::operator== (rhs));
0066     }
0067     BOOST_CXX14_CONSTEXPR bool operator<= (const date_duration& rhs) const
0068     {
0069       return (base_type::operator< (rhs) || base_type::operator== (rhs));
0070     }
0071     BOOST_CXX14_CONSTEXPR bool operator>= (const date_duration& rhs) const
0072     {
0073       return !base_type::operator< (rhs);
0074     }
0075
0076     //! Subtract another duration -- result is signed
0077     BOOST_CXX14_CONSTEXPR date_duration& operator-= (const date_duration& rhs)
0078     {
0079       base_type::operator-= (rhs);
0080       return *this;
0081     }
0082
0083     BOOST_CXX14_CONSTEXPR friend
0084     date_duration operator- (date_duration rhs, date_duration const& lhs);
0085
0086     //! Add a duration -- result is signed
0087     BOOST_CXX14_CONSTEXPR date_duration& operator+= (const date_duration& rhs)
0088     {
0089       base_type::operator+= (rhs);
0090       return *this;
0091     }
0092
0093     BOOST_CXX14_CONSTEXPR friend
0094     date_duration operator+ (date_duration rhs, date_duration const& lhs);
0095
0096     //! unary- Allows for dd = -date_duration(2); -> dd == -2
0097     BOOST_CXX14_CONSTEXPR date_duration operator- ()const
0098     {
0099       return date_duration(get_rep() * (-1));
0100     }
0101
0102     //! Division operations on a duration with an integer.
0103     BOOST_CXX14_CONSTEXPR date_duration& operator/= (int divisor)
0104     {
0105       base_type::operator/= (divisor);
0106       return *this;
0107     }
0108
0109     BOOST_CXX14_CONSTEXPR friend date_duration operator/ (date_duration rhs, int lhs);
0110
0111     //! Returns the smallest duration -- used by to calculate 'end'
0112     static BOOST_CXX14_CONSTEXPR date_duration unit()
0113     {
0114       return date_duration(base_type::unit().get_rep());
0115     }
0116   };
0117
0118   inline BOOST_CXX14_CONSTEXPR
0119   date_duration operator- (date_duration rhs, date_duration const& lhs)
0120     {
0121       rhs -= lhs;
0122       return rhs;
0123     }
0124
0125   inline BOOST_CXX14_CONSTEXPR
0126   date_duration operator+ (date_duration rhs, date_duration const& lhs)
0127     {
0128       rhs += lhs;
0129       return rhs;
0130     }
0131
0132   inline BOOST_CXX14_CONSTEXPR date_duration operator/ (date_duration rhs, int lhs)
0133     {
0134       rhs /= lhs;
0135       return rhs;
0136     }
0137
0138   //! Shorthand for date_duration
0139   typedef date_duration days;
0140
0141 } } //namespace gregorian
0142
0143 #if defined(BOOST_DATE_TIME_OPTIONAL_GREGORIAN_TYPES)
0144 #include <boost/date_time/date_duration_types.hpp>
0145 #endif
0146
0147 #endif