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Teach iso_week about local_days

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Howard Hinnant 2016-05-06 22:49:17 -04:00
parent b1d507df79
commit 183b7a82f2
1 changed files with 37 additions and 3 deletions
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40
iso_week.h
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@ -39,6 +39,7 @@ using years = date::years;
// time_point
using sys_days = date::sys_days;
using local_days = date::local_days;
// deprecated:
using day_point = sys_days;
@ -99,6 +100,7 @@ public:
CONSTCD11 weekday(date::weekday wd) NOEXCEPT;
explicit weekday(int) = delete;
CONSTCD11 weekday(const sys_days& dp) NOEXCEPT;
CONSTCD11 weekday(const local_days& dp) NOEXCEPT;
weekday& operator++() NOEXCEPT;
weekday operator++(int) NOEXCEPT;
@ -332,6 +334,7 @@ public:
CONSTCD11 iso_week::weekday weekday() const NOEXCEPT;
CONSTCD14 operator sys_days() const NOEXCEPT;
CONSTCD14 explicit operator local_days() const NOEXCEPT;
CONSTCD11 bool ok() const NOEXCEPT;
};
@ -361,6 +364,7 @@ public:
const iso_week::weekday& wd) NOEXCEPT;
CONSTCD14 year_weeknum_weekday(const year_lastweek_weekday& ylwwd) NOEXCEPT;
CONSTCD14 year_weeknum_weekday(const sys_days& dp) NOEXCEPT;
CONSTCD14 year_weeknum_weekday(const local_days& dp) NOEXCEPT;
year_weeknum_weekday& operator+=(const years& y) NOEXCEPT;
year_weeknum_weekday& operator-=(const years& y) NOEXCEPT;
@ -370,10 +374,11 @@ public:
CONSTCD11 iso_week::weekday weekday() const NOEXCEPT;
CONSTCD14 operator sys_days() const NOEXCEPT;
CONSTCD14 explicit operator local_days() const NOEXCEPT;
CONSTCD14 bool ok() const NOEXCEPT;
private:
static CONSTCD14 year_weeknum_weekday from_day_point(const sys_days& dp) NOEXCEPT;
static CONSTCD14 year_weeknum_weekday from_days(days dp) NOEXCEPT;
};
CONSTCD11 bool operator==(const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
@ -438,6 +443,12 @@ weekday::weekday(const sys_days& dp) NOEXCEPT
: wd_(weekday_from_days(dp.time_since_epoch().count()))
{}
CONSTCD11
inline
weekday::weekday(const local_days& dp) NOEXCEPT
: wd_(weekday_from_days(dp.time_since_epoch().count()))
{}
inline weekday& weekday::operator++() NOEXCEPT {if (++wd_ == 8) wd_ = 1; return *this;}
inline weekday weekday::operator++(int) NOEXCEPT {auto tmp(*this); ++(*this); return tmp;}
inline weekday& weekday::operator--() NOEXCEPT {if (wd_-- == 1) wd_ = 7; return *this;}
@ -1282,6 +1293,14 @@ year_lastweek_weekday::operator sys_days() const NOEXCEPT
- (mon - wd_);
}
CONSTCD14
inline
year_lastweek_weekday::operator local_days() const NOEXCEPT
{
return local_days{date::year{int{y_}}/date::dec/date::thu[date::last]} + (mon - thu)
- (mon - wd_);
}
CONSTCD11
inline
bool
@ -1394,7 +1413,13 @@ year_weeknum_weekday::year_weeknum_weekday(const year_lastweek_weekday& ylwwd) N
CONSTCD14
inline
year_weeknum_weekday::year_weeknum_weekday(const sys_days& dp) NOEXCEPT
: year_weeknum_weekday(from_day_point(dp))
: year_weeknum_weekday(from_days(dp.time_since_epoch()))
{}
CONSTCD14
inline
year_weeknum_weekday::year_weeknum_weekday(const local_days& dp) NOEXCEPT
: year_weeknum_weekday(from_days(dp.time_since_epoch()))
{}
inline
@ -1425,6 +1450,14 @@ year_weeknum_weekday::operator sys_days() const NOEXCEPT
+ (date::mon - date::thu) + weeks{unsigned{wn_}-1} + (wd_ - mon);
}
CONSTCD14
inline
year_weeknum_weekday::operator local_days() const NOEXCEPT
{
return local_days{date::year{int{y_}-1}/date::dec/date::thu[date::last]}
+ (date::mon - date::thu) + weeks{unsigned{wn_}-1} + (wd_ - mon);
}
CONSTCD14
inline
bool
@ -1436,8 +1469,9 @@ year_weeknum_weekday::ok() const NOEXCEPT
CONSTCD14
inline
year_weeknum_weekday
year_weeknum_weekday::from_day_point(const sys_days& dp) NOEXCEPT
year_weeknum_weekday::from_days(days d) NOEXCEPT
{
const auto dp = sys_days{d};
const auto wd = iso_week::weekday{dp};
auto y = date::year_month_day{dp + days{3}}.year();
auto start = sys_days{(y - date::years{1})/date::dec/date::thu[date::last]} + (mon-thu);