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iso_week.h
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#ifndef ISO_WEEK_H
#define ISO_WEEK_H
// The MIT License (MIT)
//
// Copyright (c) 2015, 2016, 2017 Howard Hinnant
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "date.h"
#include <climits>
namespace iso_week
{
// y/wn/wd
// wn/wd/y
// wd/wn/y
using days = date::days;
using weeks = date::weeks;
using years = date::years;
// time_point
using sys_days = date::sys_days;
using local_days = date::local_days;
// types
struct last_week
{
explicit last_week() = default;
};
class weekday;
class weeknum;
class year;
class year_weeknum;
class year_lastweek;
class weeknum_weekday;
class lastweek_weekday;
class year_weeknum_weekday;
class year_lastweek_weekday;
// date composition operators
CONSTCD11 year_weeknum operator/(const year& y, const weeknum& wn) NOEXCEPT;
CONSTCD11 year_weeknum operator/(const year& y, int wn) NOEXCEPT;
CONSTCD11 year_lastweek operator/(const year& y, last_week wn) NOEXCEPT;
CONSTCD11 weeknum_weekday operator/(const weeknum& wn, const weekday& wd) NOEXCEPT;
CONSTCD11 weeknum_weekday operator/(const weeknum& wn, int wd) NOEXCEPT;
CONSTCD11 weeknum_weekday operator/(const weekday& wd, const weeknum& wn) NOEXCEPT;
CONSTCD11 weeknum_weekday operator/(const weekday& wd, int wn) NOEXCEPT;
CONSTCD11 lastweek_weekday operator/(const last_week& wn, const weekday& wd) NOEXCEPT;
CONSTCD11 lastweek_weekday operator/(const last_week& wn, int wd) NOEXCEPT;
CONSTCD11 lastweek_weekday operator/(const weekday& wd, const last_week& wn) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator/(const year_weeknum& ywn, const weekday& wd) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator/(const year_weeknum& ywn, int wd) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator/(const weeknum_weekday& wnwd, const year& y) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator/(const weeknum_weekday& wnwd, int y) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator/(const year_lastweek& ylw, const weekday& wd) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator/(const year_lastweek& ylw, int wd) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator/(const lastweek_weekday& lwwd, const year& y) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator/(const lastweek_weekday& lwwd, int y) NOEXCEPT;
// weekday
class weekday
{
unsigned char wd_;
public:
explicit CONSTCD11 weekday(unsigned wd) NOEXCEPT;
CONSTCD11 weekday(date::weekday wd) NOEXCEPT;
explicit weekday(int) = delete;
CONSTCD11 weekday(const sys_days& dp) NOEXCEPT;
CONSTCD11 explicit weekday(const local_days& dp) NOEXCEPT;
weekday& operator++() NOEXCEPT;
weekday operator++(int) NOEXCEPT;
weekday& operator--() NOEXCEPT;
weekday operator--(int) NOEXCEPT;
weekday& operator+=(const days& d) NOEXCEPT;
weekday& operator-=(const days& d) NOEXCEPT;
CONSTCD11 explicit operator unsigned() const NOEXCEPT;
CONSTCD11 operator date::weekday() const NOEXCEPT;
CONSTCD11 bool ok() const NOEXCEPT;
private:
static CONSTCD11 unsigned char weekday_from_days(int z) NOEXCEPT;
static CONSTCD11 unsigned char to_iso_encoding(unsigned char) NOEXCEPT;
static CONSTCD11 unsigned from_iso_encoding(unsigned) NOEXCEPT;
};
CONSTCD11 bool operator==(const weekday& x, const weekday& y) NOEXCEPT;
CONSTCD11 bool operator!=(const weekday& x, const weekday& y) NOEXCEPT;
CONSTCD14 weekday operator+(const weekday& x, const days& y) NOEXCEPT;
CONSTCD14 weekday operator+(const days& x, const weekday& y) NOEXCEPT;
CONSTCD14 weekday operator-(const weekday& x, const days& y) NOEXCEPT;
CONSTCD14 days operator-(const weekday& x, const weekday& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const weekday& wd);
// year
class year
{
short y_;
public:
explicit CONSTCD11 year(int y) NOEXCEPT;
year& operator++() NOEXCEPT;
year operator++(int) NOEXCEPT;
year& operator--() NOEXCEPT;
year operator--(int) NOEXCEPT;
year& operator+=(const years& y) NOEXCEPT;
year& operator-=(const years& y) NOEXCEPT;
CONSTCD14 bool is_leap() const NOEXCEPT;
CONSTCD11 explicit operator int() const NOEXCEPT;
CONSTCD11 bool ok() const NOEXCEPT;
static CONSTCD11 year min() NOEXCEPT;
static CONSTCD11 year max() NOEXCEPT;
};
CONSTCD11 bool operator==(const year& x, const year& y) NOEXCEPT;
CONSTCD11 bool operator!=(const year& x, const year& y) NOEXCEPT;
CONSTCD11 bool operator< (const year& x, const year& y) NOEXCEPT;
CONSTCD11 bool operator> (const year& x, const year& y) NOEXCEPT;
CONSTCD11 bool operator<=(const year& x, const year& y) NOEXCEPT;
CONSTCD11 bool operator>=(const year& x, const year& y) NOEXCEPT;
CONSTCD11 year operator+(const year& x, const years& y) NOEXCEPT;
CONSTCD11 year operator+(const years& x, const year& y) NOEXCEPT;
CONSTCD11 year operator-(const year& x, const years& y) NOEXCEPT;
CONSTCD11 years operator-(const year& x, const year& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const year& y);
// weeknum
class weeknum
{
unsigned char wn_;
public:
explicit CONSTCD11 weeknum(unsigned wn) NOEXCEPT;
weeknum& operator++() NOEXCEPT;
weeknum operator++(int) NOEXCEPT;
weeknum& operator--() NOEXCEPT;
weeknum operator--(int) NOEXCEPT;
weeknum& operator+=(const weeks& y) NOEXCEPT;
weeknum& operator-=(const weeks& y) NOEXCEPT;
CONSTCD11 explicit operator unsigned() const NOEXCEPT;
CONSTCD11 bool ok() const NOEXCEPT;
};
CONSTCD11 bool operator==(const weeknum& x, const weeknum& y) NOEXCEPT;
CONSTCD11 bool operator!=(const weeknum& x, const weeknum& y) NOEXCEPT;
CONSTCD11 bool operator< (const weeknum& x, const weeknum& y) NOEXCEPT;
CONSTCD11 bool operator> (const weeknum& x, const weeknum& y) NOEXCEPT;
CONSTCD11 bool operator<=(const weeknum& x, const weeknum& y) NOEXCEPT;
CONSTCD11 bool operator>=(const weeknum& x, const weeknum& y) NOEXCEPT;
CONSTCD11 weeknum operator+(const weeknum& x, const weeks& y) NOEXCEPT;
CONSTCD11 weeknum operator+(const weeks& x, const weeknum& y) NOEXCEPT;
CONSTCD11 weeknum operator-(const weeknum& x, const weeks& y) NOEXCEPT;
CONSTCD11 weeks operator-(const weeknum& x, const weeknum& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const weeknum& wn);
// year_weeknum
class year_weeknum
{
iso_week::year y_;
iso_week::weeknum wn_;
public:
CONSTCD11 year_weeknum(const iso_week::year& y, const iso_week::weeknum& wn) NOEXCEPT;
CONSTCD11 iso_week::year year() const NOEXCEPT;
CONSTCD11 iso_week::weeknum weeknum() const NOEXCEPT;
year_weeknum& operator+=(const years& dy) NOEXCEPT;
year_weeknum& operator-=(const years& dy) NOEXCEPT;
CONSTCD11 bool ok() const NOEXCEPT;
};
CONSTCD11 bool operator==(const year_weeknum& x, const year_weeknum& y) NOEXCEPT;
CONSTCD11 bool operator!=(const year_weeknum& x, const year_weeknum& y) NOEXCEPT;
CONSTCD11 bool operator< (const year_weeknum& x, const year_weeknum& y) NOEXCEPT;
CONSTCD11 bool operator> (const year_weeknum& x, const year_weeknum& y) NOEXCEPT;
CONSTCD11 bool operator<=(const year_weeknum& x, const year_weeknum& y) NOEXCEPT;
CONSTCD11 bool operator>=(const year_weeknum& x, const year_weeknum& y) NOEXCEPT;
CONSTCD11 year_weeknum operator+(const year_weeknum& ym, const years& dy) NOEXCEPT;
CONSTCD11 year_weeknum operator+(const years& dy, const year_weeknum& ym) NOEXCEPT;
CONSTCD11 year_weeknum operator-(const year_weeknum& ym, const years& dy) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const year_weeknum& ym);
// year_lastweek
class year_lastweek
{
iso_week::year y_;
public:
CONSTCD11 explicit year_lastweek(const iso_week::year& y) NOEXCEPT;
CONSTCD11 iso_week::year year() const NOEXCEPT;
CONSTCD14 iso_week::weeknum weeknum() const NOEXCEPT;
year_lastweek& operator+=(const years& dy) NOEXCEPT;
year_lastweek& operator-=(const years& dy) NOEXCEPT;
CONSTCD11 bool ok() const NOEXCEPT;
};
CONSTCD11 bool operator==(const year_lastweek& x, const year_lastweek& y) NOEXCEPT;
CONSTCD11 bool operator!=(const year_lastweek& x, const year_lastweek& y) NOEXCEPT;
CONSTCD11 bool operator< (const year_lastweek& x, const year_lastweek& y) NOEXCEPT;
CONSTCD11 bool operator> (const year_lastweek& x, const year_lastweek& y) NOEXCEPT;
CONSTCD11 bool operator<=(const year_lastweek& x, const year_lastweek& y) NOEXCEPT;
CONSTCD11 bool operator>=(const year_lastweek& x, const year_lastweek& y) NOEXCEPT;
CONSTCD11 year_lastweek operator+(const year_lastweek& ym, const years& dy) NOEXCEPT;
CONSTCD11 year_lastweek operator+(const years& dy, const year_lastweek& ym) NOEXCEPT;
CONSTCD11 year_lastweek operator-(const year_lastweek& ym, const years& dy) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const year_lastweek& ym);
// weeknum_weekday
class weeknum_weekday
{
iso_week::weeknum wn_;
iso_week::weekday wd_;
public:
CONSTCD11 weeknum_weekday(const iso_week::weeknum& wn,
const iso_week::weekday& wd) NOEXCEPT;
CONSTCD11 iso_week::weeknum weeknum() const NOEXCEPT;
CONSTCD11 iso_week::weekday weekday() const NOEXCEPT;
CONSTCD14 bool ok() const NOEXCEPT;
};
CONSTCD11 bool operator==(const weeknum_weekday& x, const weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator!=(const weeknum_weekday& x, const weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator< (const weeknum_weekday& x, const weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator> (const weeknum_weekday& x, const weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator<=(const weeknum_weekday& x, const weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator>=(const weeknum_weekday& x, const weeknum_weekday& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const weeknum_weekday& md);
// lastweek_weekday
class lastweek_weekday
{
iso_week::weekday wd_;
public:
CONSTCD11 explicit lastweek_weekday(const iso_week::weekday& wd) NOEXCEPT;
CONSTCD11 iso_week::weekday weekday() const NOEXCEPT;
CONSTCD14 bool ok() const NOEXCEPT;
};
CONSTCD11 bool operator==(const lastweek_weekday& x, const lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator!=(const lastweek_weekday& x, const lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator< (const lastweek_weekday& x, const lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator> (const lastweek_weekday& x, const lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator<=(const lastweek_weekday& x, const lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator>=(const lastweek_weekday& x, const lastweek_weekday& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const lastweek_weekday& md);
// year_lastweek_weekday
class year_lastweek_weekday
{
iso_week::year y_;
iso_week::weekday wd_;
public:
CONSTCD11 year_lastweek_weekday(const iso_week::year& y,
const iso_week::weekday& wd) NOEXCEPT;
year_lastweek_weekday& operator+=(const years& y) NOEXCEPT;
year_lastweek_weekday& operator-=(const years& y) NOEXCEPT;
CONSTCD11 iso_week::year year() const NOEXCEPT;
CONSTCD14 iso_week::weeknum weeknum() const NOEXCEPT;
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;
};
CONSTCD11 bool operator==(const year_lastweek_weekday& x, const year_lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator!=(const year_lastweek_weekday& x, const year_lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator< (const year_lastweek_weekday& x, const year_lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator> (const year_lastweek_weekday& x, const year_lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator<=(const year_lastweek_weekday& x, const year_lastweek_weekday& y) NOEXCEPT;
CONSTCD11 bool operator>=(const year_lastweek_weekday& x, const year_lastweek_weekday& y) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator+(const year_lastweek_weekday& ywnwd, const years& y) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator+(const years& y, const year_lastweek_weekday& ywnwd) NOEXCEPT;
CONSTCD11 year_lastweek_weekday operator-(const year_lastweek_weekday& ywnwd, const years& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const year_lastweek_weekday& ywnwd);
// class year_weeknum_weekday
class year_weeknum_weekday
{
iso_week::year y_;
iso_week::weeknum wn_;
iso_week::weekday wd_;
public:
CONSTCD11 year_weeknum_weekday(const iso_week::year& y, const iso_week::weeknum& wn,
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 explicit year_weeknum_weekday(const local_days& dp) NOEXCEPT;
year_weeknum_weekday& operator+=(const years& y) NOEXCEPT;
year_weeknum_weekday& operator-=(const years& y) NOEXCEPT;
CONSTCD11 iso_week::year year() const NOEXCEPT;
CONSTCD11 iso_week::weeknum weeknum() const NOEXCEPT;
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_days(days dp) NOEXCEPT;
};
CONSTCD11 bool operator==(const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator!=(const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator< (const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator> (const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator<=(const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
CONSTCD11 bool operator>=(const year_weeknum_weekday& x, const year_weeknum_weekday& y) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator+(const year_weeknum_weekday& ywnwd, const years& y) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator+(const years& y, const year_weeknum_weekday& ywnwd) NOEXCEPT;
CONSTCD11 year_weeknum_weekday operator-(const year_weeknum_weekday& ywnwd, const years& y) NOEXCEPT;
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const year_weeknum_weekday& ywnwd);
//----------------+
// Implementation |
//----------------+
// weekday
CONSTCD11
inline
unsigned char
weekday::to_iso_encoding(unsigned char z) NOEXCEPT
{
return z != 0 ? z : (unsigned char)7;
}
CONSTCD11
inline
unsigned
weekday::from_iso_encoding(unsigned z) NOEXCEPT
{
return z != 7 ? z : 0u;
}
CONSTCD11
inline
unsigned char
weekday::weekday_from_days(int z) NOEXCEPT
{
return to_iso_encoding(static_cast<unsigned char>(static_cast<unsigned>(
z >= -4 ? (z+4) % 7 : (z+5) % 7 + 6)));
}
CONSTCD11
inline
weekday::weekday(unsigned wd) NOEXCEPT
: wd_(static_cast<decltype(wd_)>(wd))
{}
CONSTCD11
inline
weekday::weekday(date::weekday wd) NOEXCEPT
: wd_(wd.iso_encoding())
{}
CONSTCD11
inline
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;}
inline weekday weekday::operator--(int) NOEXCEPT {auto tmp(*this); --(*this); return tmp;}
inline
weekday&
weekday::operator+=(const days& d) NOEXCEPT
{
*this = *this + d;
return *this;
}
inline
weekday&
weekday::operator-=(const days& d) NOEXCEPT
{
*this = *this - d;
return *this;
}
CONSTCD11
inline
weekday::operator unsigned() const NOEXCEPT
{
return wd_;
}
CONSTCD11
inline
weekday::operator date::weekday() const NOEXCEPT
{
return date::weekday{from_iso_encoding(unsigned{wd_})};
}
CONSTCD11 inline bool weekday::ok() const NOEXCEPT {return 1 <= wd_ && wd_ <= 7;}
CONSTCD11
inline
bool
operator==(const weekday& x, const weekday& y) NOEXCEPT
{
return static_cast<unsigned>(x) == static_cast<unsigned>(y);
}
CONSTCD11
inline
bool
operator!=(const weekday& x, const weekday& y) NOEXCEPT
{
return !(x == y);
}
CONSTCD14
inline
days
operator-(const weekday& x, const weekday& y) NOEXCEPT
{
auto const diff = static_cast<unsigned>(x) - static_cast<unsigned>(y);
return days{diff <= 6 ? diff : diff + 7};
}
CONSTCD14
inline
weekday
operator+(const weekday& x, const days& y) NOEXCEPT
{
auto const wdu = static_cast<long long>(static_cast<unsigned>(x) - 1u) + y.count();
auto const wk = (wdu >= 0 ? wdu : wdu-6) / 7;
return weekday{static_cast<unsigned>(wdu - wk * 7) + 1u};
}
CONSTCD14
inline
weekday
operator+(const days& x, const weekday& y) NOEXCEPT
{
return y + x;
}
CONSTCD14
inline
weekday
operator-(const weekday& x, const days& y) NOEXCEPT
{
return x + -y;
}
template<class CharT, class Traits>
inline
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const weekday& wd)
{
switch (static_cast<unsigned>(wd))
{
case 7:
os << "Sun";
break;
case 1:
os << "Mon";
break;
case 2:
os << "Tue";
break;
case 3:
os << "Wed";
break;
case 4:
os << "Thu";
break;
case 5:
os << "Fri";
break;
case 6:
os << "Sat";
break;
default:
os << static_cast<unsigned>(wd) << " is not a valid weekday";
break;
}
return os;
}
// year
CONSTCD11 inline year::year(int y) NOEXCEPT : y_(static_cast<decltype(y_)>(y)) {}
inline year& year::operator++() NOEXCEPT {++y_; return *this;}
inline year year::operator++(int) NOEXCEPT {auto tmp(*this); ++(*this); return tmp;}
inline year& year::operator--() NOEXCEPT {--y_; return *this;}
inline year year::operator--(int) NOEXCEPT {auto tmp(*this); --(*this); return tmp;}
inline year& year::operator+=(const years& y) NOEXCEPT {*this = *this + y; return *this;}
inline year& year::operator-=(const years& y) NOEXCEPT {*this = *this - y; return *this;}
CONSTCD14
inline
bool
year::is_leap() const NOEXCEPT
{
const auto y = date::year{static_cast<int>(y_)};
const auto s0 = sys_days((y-years{1})/12/date::thu[date::last]);
const auto s1 = sys_days(y/12/date::thu[date::last]);
return s1-s0 != days{7*52};
}
CONSTCD11 inline year::operator int() const NOEXCEPT {return y_;}
CONSTCD11 inline bool year::ok() const NOEXCEPT {return min() <= *this && *this <= max();}
CONSTCD11
inline
year
year::min() NOEXCEPT
{
using std::chrono::seconds;
using std::chrono::minutes;
using std::chrono::hours;
using std::chrono::duration_cast;
static_assert(sizeof(seconds)*CHAR_BIT >= 41, "seconds may overflow");
static_assert(sizeof(hours)*CHAR_BIT >= 30, "hours may overflow");
return sizeof(minutes)*CHAR_BIT < 34 ?
year{1970} + duration_cast<years>(minutes::min()) :
year{std::numeric_limits<short>::min()};
}
CONSTCD11
inline
year
year::max() NOEXCEPT
{
using std::chrono::seconds;
using std::chrono::minutes;
using std::chrono::hours;
using std::chrono::duration_cast;
static_assert(sizeof(seconds)*CHAR_BIT >= 41, "seconds may overflow");
static_assert(sizeof(hours)*CHAR_BIT >= 30, "hours may overflow");
return sizeof(minutes)*CHAR_BIT < 34 ?
year{1969} + duration_cast<years>(minutes::max()) :
year{std::numeric_limits<short>::max()};
}
CONSTCD11
inline
bool
operator==(const year& x, const year& y) NOEXCEPT
{
return static_cast<int>(x) == static_cast<int>(y);
}
CONSTCD11
inline
bool
operator!=(const year& x, const year& y) NOEXCEPT
{
return !(x == y);
}
CONSTCD11
inline
bool
operator<(const year& x, const year& y) NOEXCEPT
{
return static_cast<int>(x) < static_cast<int>(y);
}
CONSTCD11
inline
bool
operator>(const year& x, const year& y) NOEXCEPT
{
return y < x;
}
CONSTCD11
inline
bool
operator<=(const year& x, const year& y) NOEXCEPT
{
return !(y < x);
}
CONSTCD11
inline
bool
operator>=(const year& x, const year& y) NOEXCEPT
{
return !(x < y);
}
CONSTCD11
inline
years
operator-(const year& x, const year& y) NOEXCEPT
{
return years{static_cast<int>(x) - static_cast<int>(y)};
}
CONSTCD11
inline
year
operator+(const year& x, const years& y) NOEXCEPT
{
return year{static_cast<int>(x) + y.count()};
}
CONSTCD11
inline
year
operator+(const years& x, const year& y) NOEXCEPT
{
return y + x;
}
CONSTCD11
inline
year
operator-(const year& x, const years& y) NOEXCEPT
{
return year{static_cast<int>(x) - y.count()};
}
template<class CharT, class Traits>
inline
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const year& y)
{
date::detail::save_ostream<CharT, Traits> _(os);
os.fill('0');
os.flags(std::ios::dec | std::ios::internal);
os.width(4 + (y < year{0}));
os << static_cast<int>(y);
return os;
}
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
inline namespace literals
{
CONSTCD11
inline
iso_week::year
operator ""_y(unsigned long long y) NOEXCEPT
{
return iso_week::year(static_cast<int>(y));
}
CONSTCD11
inline
iso_week::weeknum
operator ""_w(unsigned long long wn) NOEXCEPT
{
return iso_week::weeknum(static_cast<unsigned>(wn));
}
#endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
CONSTDATA iso_week::last_week last{};
CONSTDATA iso_week::weekday sun{7u};
CONSTDATA iso_week::weekday mon{1u};
CONSTDATA iso_week::weekday tue{2u};
CONSTDATA iso_week::weekday wed{3u};
CONSTDATA iso_week::weekday thu{4u};
CONSTDATA iso_week::weekday fri{5u};
CONSTDATA iso_week::weekday sat{6u};
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
} // inline namespace literals
#endif
// weeknum
CONSTCD11
inline
weeknum::weeknum(unsigned wn) NOEXCEPT
: wn_(static_cast<decltype(wn_)>(wn))
{}
inline weeknum& weeknum::operator++() NOEXCEPT {++wn_; return *this;}
inline weeknum weeknum::operator++(int) NOEXCEPT {auto tmp(*this); ++(*this); return tmp;}
inline weeknum& weeknum::operator--() NOEXCEPT {--wn_; return *this;}
inline weeknum weeknum::operator--(int) NOEXCEPT {auto tmp(*this); --(*this); return tmp;}
inline
weeknum&
weeknum::operator+=(const weeks& y) NOEXCEPT
{
*this = *this + y;
return *this;
}
inline
weeknum&
weeknum::operator-=(const weeks& y) NOEXCEPT
{
*this = *this - y;
return *this;
}
CONSTCD11 inline weeknum::operator unsigned() const NOEXCEPT {return wn_;}
CONSTCD11 inline bool weeknum::ok() const NOEXCEPT {return 1 <= wn_ && wn_ <= 53;}
CONSTCD11
inline
bool
operator==(const weeknum& x, const weeknum& y) NOEXCEPT
{
return static_cast<unsigned>(x) == static_cast<unsigned>(y);
}
CONSTCD11
inline
bool
operator!=(const weeknum& x, const weeknum& y) NOEXCEPT
{
return !(x == y);
}
CONSTCD11
inline
bool
operator<(const weeknum& x, const weeknum& y) NOEXCEPT
{
return static_cast<unsigned>(x) < static_cast<unsigned>(y);
}
CONSTCD11
inline
bool
operator>(const weeknum& x, const weeknum& y) NOEXCEPT
{
return y < x;
}
CONSTCD11
inline
bool
operator<=(const weeknum& x, const weeknum& y) NOEXCEPT
{
return !(y < x);
}
CONSTCD11
inline
bool
operator>=(const weeknum& x, const weeknum& y) NOEXCEPT
{
return !(x < y);
}
CONSTCD11
inline
weeks
operator-(const weeknum& x, const weeknum& y) NOEXCEPT
{
return weeks{static_cast<weeks::rep>(static_cast<unsigned>(x)) -
static_cast<weeks::rep>(static_cast<unsigned>(y))};
}
CONSTCD11
inline
weeknum
operator+(const weeknum& x, const weeks& y) NOEXCEPT
{
return weeknum{static_cast<unsigned>(x) + static_cast<unsigned>(y.count())};
}
CONSTCD11
inline
weeknum
operator+(const weeks& x, const weeknum& y) NOEXCEPT
{
return y + x;
}
CONSTCD11
inline
weeknum
operator-(const weeknum& x, const weeks& y) NOEXCEPT
{
return x + -y;
}
template<class CharT, class Traits>
inline
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const weeknum& wn)
{
date::detail::save_ostream<CharT, Traits> _(os);
os << 'W';
os.fill('0');
os.flags(std::ios::dec | std::ios::right);
os.width(2);
os << static_cast<unsigned>(wn);
return os;
}
// year_weeknum
CONSTCD11
inline
year_weeknum::year_weeknum(const iso_week::year& y, const iso_week::weeknum& wn) NOEXCEPT
: y_(y)
, wn_(wn)
{}
CONSTCD11 inline year year_weeknum::year() const NOEXCEPT {return y_;}
CONSTCD11 inline weeknum year_weeknum::weeknum() const NOEXCEPT {return wn_;}
CONSTCD11 inline bool year_weeknum::ok() const NOEXCEPT
{
return y_.ok() && 1u <= static_cast<unsigned>(wn_) && wn_ <= (y_/last).weeknum();
}
inline
year_weeknum&
year_weeknum::operator+=(const years& dy) NOEXCEPT
{
*this = *this + dy;
return *this;
}
inline
year_weeknum&
year_weeknum::operator-=(const years& dy) NOEXCEPT
{
*this = *this - dy;
return *this;
}
CONSTCD11
inline
bool
operator==(const year_weeknum& x, const year_weeknum& y) NOEXCEPT
{
return x.year() == y.year() && x.weeknum() == y.weeknum();
}
CONSTCD11
inline
bool
operator!=(const year_weeknum& x, const year_weeknum& y) NOEXCEPT
{
return !(x == y);
}
CONSTCD11
inline
bool
operator<(const year_weeknum& x, const year_weeknum& y) NOEXCEPT
{
return x.year() < y.year() ? true
: (x.year() > y.year() ? false
: (x.weeknum() < y.weeknum()));
}
CONSTCD11
inline
bool
operator>(const year_weeknum& x, const year_weeknum& y) NOEXCEPT
{
return y < x;
}
CONSTCD11
inline
bool
operator<=(const year_weeknum& x, const year_weeknum& y) NOEXCEPT
{
return !(y < x);
}
CONSTCD11
inline
bool
operator>=(const year_weeknum& x, const year_weeknum& y) NOEXCEPT
{
return !(x < y);
}
CONSTCD11
inline
year_weeknum
operator+(const year_weeknum& ym, const years& dy) NOEXCEPT
{
return (ym.year() + dy) / ym.weeknum();
}
CONSTCD11
inline
year_weeknum
operator+(const years& dy, const year_weeknum& ym) NOEXCEPT
{