boost/date_time/date_duration_types.hpp
#ifndef DATE_DURATION_TYPES_HPP___
#define DATE_DURATION_TYPES_HPP___
/* Copyright (c) 2004 CrystalClear Software, Inc.
* 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
* $Date$
*/
#include <boost/date_time/compiler_config.hpp>
#include <boost/date_time/int_adapter.hpp>
#include <boost/date_time/special_defs.hpp>
#include <boost/date_time/date_duration.hpp>
namespace boost {
namespace date_time {
//! Additional duration type that represents a number of n*7 days
template <class duration_config>
class BOOST_SYMBOL_VISIBLE weeks_duration : public date_duration<duration_config> {
public:
weeks_duration(typename duration_config::impl_type w)
: date_duration<duration_config>(w * 7) {}
weeks_duration(special_values sv)
: date_duration<duration_config>(sv) {}
};
// predeclare
template<class t>
class BOOST_SYMBOL_VISIBLE years_duration;
//! additional duration type that represents a logical month
/*! A logical month enables things like: "date(2002,Mar,2) + months(2) ->
* 2002-May2". If the date is a last day-of-the-month, the result will
* also be a last-day-of-the-month.
*/
template<class base_config>
class BOOST_SYMBOL_VISIBLE months_duration
{
private:
typedef typename base_config::int_rep int_rep;
typedef typename int_rep::int_type int_type;
typedef typename base_config::date_type date_type;
typedef typename date_type::duration_type duration_type;
typedef typename base_config::month_adjustor_type month_adjustor_type;
typedef months_duration<base_config> months_type;
typedef years_duration<base_config> years_type;
public:
months_duration(int_rep num) : _m(num) {}
months_duration(special_values sv) : _m(sv)
{
_m = int_rep::from_special(sv);
}
int_rep number_of_months() const { return _m; }
//! returns a negative duration
duration_type get_neg_offset(const date_type& d) const
{
month_adjustor_type m_adj(_m.as_number());
return duration_type(m_adj.get_neg_offset(d));
}
duration_type get_offset(const date_type& d) const
{
month_adjustor_type m_adj(_m.as_number());
return duration_type(m_adj.get_offset(d));
}
bool operator==(const months_type& rhs) const
{
return(_m == rhs._m);
}
bool operator!=(const months_type& rhs) const
{
return(_m != rhs._m);
}
months_type operator+(const months_type& rhs)const
{
return months_type(_m + rhs._m);
}
months_type& operator+=(const months_type& rhs)
{
_m = _m + rhs._m;
return *this;
}
months_type operator-(const months_type& rhs)const
{
return months_type(_m - rhs._m);
}
months_type& operator-=(const months_type& rhs)
{
_m = _m - rhs._m;
return *this;
}
months_type operator*(const int_type rhs)const
{
return months_type(_m * rhs);
}
months_type& operator*=(const int_type rhs)
{
_m = _m * rhs;
return *this;
}
months_type operator/(const int_type rhs)const
{
return months_type(_m / rhs);
}
months_type& operator/=(const int_type rhs)
{
_m = _m / rhs;
return *this;
}
months_type operator+(const years_type& y)const
{
return months_type(y.number_of_years() * 12 + _m);
}
months_type& operator+=(const years_type& y)
{
_m = y.number_of_years() * 12 + _m;
return *this;
}
months_type operator-(const years_type& y) const
{
return months_type(_m - y.number_of_years() * 12);
}
months_type& operator-=(const years_type& y)
{
_m = _m - y.number_of_years() * 12;
return *this;
}
//
friend date_type operator+(const date_type& d, const months_type& m)
{
return d + m.get_offset(d);
}
friend date_type operator+=(date_type& d, const months_type& m)
{
return d += m.get_offset(d);
}
friend date_type operator-(const date_type& d, const months_type& m)
{
// get_neg_offset returns a negative duration, so we add
return d + m.get_neg_offset(d);
}
friend date_type operator-=(date_type& d, const months_type& m)
{
// get_neg_offset returns a negative duration, so we add
return d += m.get_neg_offset(d);
}
private:
int_rep _m;
};
//! additional duration type that represents a logical year
/*! A logical year enables things like: "date(2002,Mar,2) + years(2) ->
* 2004-Mar-2". If the date is a last day-of-the-month, the result will
* also be a last-day-of-the-month (ie date(2001-Feb-28) + years(3) ->
* 2004-Feb-29).
*/
template<class base_config>
class BOOST_SYMBOL_VISIBLE years_duration
{
private:
typedef typename base_config::int_rep int_rep;
typedef typename int_rep::int_type int_type;
typedef typename base_config::date_type date_type;
typedef typename date_type::duration_type duration_type;
typedef typename base_config::month_adjustor_type month_adjustor_type;
typedef years_duration<base_config> years_type;
typedef months_duration<base_config> months_type;
public:
years_duration(int_rep num) : _y(num) {}
years_duration(special_values sv) : _y(sv)
{
_y = int_rep::from_special(sv);
}
int_rep number_of_years() const { return _y; }
//! returns a negative duration
duration_type get_neg_offset(const date_type& d) const
{
month_adjustor_type m_adj(_y.as_number() * 12);
return duration_type(m_adj.get_neg_offset(d));
}
duration_type get_offset(const date_type& d) const
{
month_adjustor_type m_adj(_y.as_number() * 12);
return duration_type(m_adj.get_offset(d));
}
bool operator==(const years_type& rhs) const
{
return(_y == rhs._y);
}
bool operator!=(const years_type& rhs) const
{
return(_y != rhs._y);
}
years_type operator+(const years_type& rhs)const
{
return years_type(_y + rhs._y);
}
years_type& operator+=(const years_type& rhs)
{
_y = _y + rhs._y;
return *this;
}
years_type operator-(const years_type& rhs)const
{
return years_type(_y - rhs._y);
}
years_type& operator-=(const years_type& rhs)
{
_y = _y - rhs._y;
return *this;
}
years_type operator*(const int_type rhs)const
{
return years_type(_y * rhs);
}
years_type& operator*=(const int_type rhs)
{
_y = _y * rhs;
return *this;
}
years_type operator/(const int_type rhs)const
{
return years_type(_y / rhs);
}
years_type& operator/=(const int_type rhs)
{
_y = _y / rhs;
return *this;
}
months_type operator+(const months_type& m) const
{
return(months_type(_y * 12 + m.number_of_months()));
}
months_type operator-(const months_type& m) const
{
return(months_type(_y * 12 - m.number_of_months()));
}
//
friend date_type operator+(const date_type& d, const years_type& y)
{
return d + y.get_offset(d);
}
friend date_type operator+=(date_type& d, const years_type& y)
{
return d += y.get_offset(d);
}
friend date_type operator-(const date_type& d, const years_type& y)
{
// get_neg_offset returns a negative duration, so we add
return d + y.get_neg_offset(d);
}
friend date_type operator-=(date_type& d, const years_type& y)
{
// get_neg_offset returns a negative duration, so we add
return d += y.get_neg_offset(d);
}
private:
int_rep _y;
};
}} // namespace boost::date_time
#endif // DATE_DURATION_TYPES_HPP___