chrono
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// <chrono> -*- C++ -*-
// Copyright (C) 2008-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/chrono
* This is a Standard C++ Library header.
* @ingroup chrono
*/
#ifndef _GLIBCXX_CHRONO
#define _GLIBCXX_CHRONO 1
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <bits/chrono.h>
#if __cplusplus > 201703L
# include <sstream> // ostringstream
# include <bits/charconv.h>
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @defgroup chrono Time
* @ingroup utilities
*
* Classes and functions for time.
*
* @since C++11
*/
/** @namespace std::chrono
* @brief ISO C++ 2011 namespace for date and time utilities
* @ingroup chrono
*/
namespace chrono
{
#if __cplusplus >= 202002L
/// @addtogroup chrono
/// @{
struct local_t { };
template<typename _Duration>
using local_time = time_point<local_t, _Duration>;
using local_seconds = local_time<seconds>;
using local_days = local_time<days>;
class utc_clock;
class tai_clock;
class gps_clock;
template<typename _Duration>
using utc_time = time_point<utc_clock, _Duration>;
using utc_seconds = utc_time<seconds>;
template<typename _Duration>
using tai_time = time_point<tai_clock, _Duration>;
using tai_seconds = tai_time<seconds>;
template<typename _Duration>
using gps_time = time_point<gps_clock, _Duration>;
using gps_seconds = gps_time<seconds>;
template<> struct is_clock<utc_clock> : true_type { };
template<> struct is_clock<tai_clock> : true_type { };
template<> struct is_clock<gps_clock> : true_type { };
template<> inline constexpr bool is_clock_v<utc_clock> = true;
template<> inline constexpr bool is_clock_v<tai_clock> = true;
template<> inline constexpr bool is_clock_v<gps_clock> = true;
struct leap_second_info
{
bool is_leap_second;
seconds elapsed;
};
// CALENDRICAL TYPES
// CLASS DECLARATIONS
class day;
class month;
class year;
class weekday;
class weekday_indexed;
class weekday_last;
class month_day;
class month_day_last;
class month_weekday;
class month_weekday_last;
class year_month;
class year_month_day;
class year_month_day_last;
class year_month_weekday;
class year_month_weekday_last;
struct last_spec
{
explicit last_spec() = default;
friend constexpr month_day_last
operator/(int __m, last_spec) noexcept;
friend constexpr month_day_last
operator/(last_spec, int __m) noexcept;
};
inline constexpr last_spec last{};
namespace __detail
{
// Compute the remainder of the Euclidean division of __n divided by __d.
// Euclidean division truncates toward negative infinity and always
// produces a remainder in the range of [0,__d-1] (whereas standard
// division truncates toward zero and yields a nonpositive remainder
// for negative __n).
constexpr unsigned
__modulo(long long __n, unsigned __d)
{
if (__n >= 0)
return __n % __d;
else
return (__d + (__n % __d)) % __d;
}
inline constexpr unsigned __days_per_month[12]
= { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
}
// DAY
class day
{
private:
unsigned char _M_d;
public:
day() = default;
explicit constexpr
day(unsigned __d) noexcept
: _M_d(__d)
{ }
constexpr day&
operator++() noexcept
{
++_M_d;
return *this;
}
constexpr day
operator++(int) noexcept
{
auto __ret = *this;
++(*this);
return __ret;
}
constexpr day&
operator--() noexcept
{
--_M_d;
return *this;
}
constexpr day
operator--(int) noexcept
{
auto __ret = *this;
--(*this);
return __ret;
}
constexpr day&
operator+=(const days& __d) noexcept
{
*this = *this + __d;
return *this;
}
constexpr day&
operator-=(const days& __d) noexcept
{
*this = *this - __d;
return *this;
}
constexpr explicit
operator unsigned() const noexcept
{ return _M_d; }
constexpr bool
ok() const noexcept
{ return 1 <= _M_d && _M_d <= 31; }
friend constexpr bool
operator==(const day& __x, const day& __y) noexcept
{ return unsigned{__x} == unsigned{__y}; }
friend constexpr strong_ordering
operator<=>(const day& __x, const day& __y) noexcept
{ return unsigned{__x} <=> unsigned{__y}; }
friend constexpr day
operator+(const day& __x, const days& __y) noexcept
{ return day(unsigned{__x} + __y.count()); }
friend constexpr day
operator+(const days& __x, const day& __y) noexcept
{ return __y + __x; }
friend constexpr day
operator-(const day& __x, const days& __y) noexcept
{ return __x + -__y; }
friend constexpr days
operator-(const day& __x, const day& __y) noexcept
{ return days{int(unsigned{__x}) - int(unsigned{__y})}; }
friend constexpr month_day
operator/(const month& __m, const day& __d) noexcept;
friend constexpr month_day
operator/(int __m, const day& __d) noexcept;
friend constexpr month_day
operator/(const day& __d, const month& __m) noexcept;
friend constexpr month_day
operator/(const day& __d, int __m) noexcept;
friend constexpr year_month_day
operator/(const year_month& __ym, const day& __d) noexcept;
// TODO: Implement operator<<, to_stream, from_stream.
};
// MONTH
class month
{
private:
unsigned char _M_m;
public:
month() = default;
explicit constexpr
month(unsigned __m) noexcept
: _M_m(__m)
{ }
constexpr month&
operator++() noexcept
{
*this += months{1};
return *this;
}
constexpr month
operator++(int) noexcept
{
auto __ret = *this;
++(*this);
return __ret;
}
constexpr month&
operator--() noexcept
{
*this -= months{1};
return *this;
}
constexpr month
operator--(int) noexcept
{
auto __ret = *this;
--(*this);
return __ret;
}
constexpr month&
operator+=(const months& __m) noexcept
{
*this = *this + __m;
return *this;
}
constexpr month&
operator-=(const months& __m) noexcept
{
*this = *this - __m;
return *this;
}
explicit constexpr
operator unsigned() const noexcept
{ return _M_m; }
constexpr bool
ok() const noexcept
{ return 1 <= _M_m && _M_m <= 12; }
friend constexpr bool
operator==(const month& __x, const month& __y) noexcept
{ return unsigned{__x} == unsigned{__y}; }
friend constexpr strong_ordering
operator<=>(const month& __x, const month& __y) noexcept
{ return unsigned{__x} <=> unsigned{__y}; }
friend constexpr month
operator+(const month& __x, const months& __y) noexcept
{
auto __n = static_cast<long long>(unsigned{__x}) + (__y.count() - 1);
return month{__detail::__modulo(__n, 12) + 1};
}
friend constexpr month
operator+(const months& __x, const month& __y) noexcept
{ return __y + __x; }
friend constexpr month
operator-(const month& __x, const months& __y) noexcept
{ return __x + -__y; }
friend constexpr months
operator-(const month& __x, const month& __y) noexcept
{
const auto __dm = int(unsigned(__x)) - int(unsigned(__y));
return months{__dm < 0 ? 12 + __dm : __dm};
}
friend constexpr year_month
operator/(const year& __y, const month& __m) noexcept;
friend constexpr month_day
operator/(const month& __m, int __d) noexcept;
friend constexpr month_day_last
operator/(const month& __m, last_spec) noexcept;
friend constexpr month_day_last
operator/(last_spec, const month& __m) noexcept;
friend constexpr month_weekday
operator/(const month& __m, const weekday_indexed& __wdi) noexcept;
friend constexpr month_weekday
operator/(const weekday_indexed& __wdi, const month& __m) noexcept;
friend constexpr month_weekday_last
operator/(const month& __m, const weekday_last& __wdl) noexcept;
friend constexpr month_weekday_last
operator/(const weekday_last& __wdl, const month& __m) noexcept;
// TODO: Implement operator<<, to_stream, from_stream.
};
inline constexpr month January{1};
inline constexpr month February{2};
inline constexpr month March{3};
inline constexpr month April{4};
inline constexpr month May{5};
inline constexpr month June{6};
inline constexpr month July{7};
inline constexpr month August{8};
inline constexpr month September{9};
inline constexpr month October{10};
inline constexpr month November{11};
inline constexpr month December{12};
// YEAR
class year
{
private:
short _M_y;
public:
year() = default;
explicit constexpr
year(int __y) noexcept
: _M_y{static_cast<short>(__y)}
{ }
static constexpr year
min() noexcept
{ return year{-32767}; }
static constexpr year
max() noexcept
{ return year{32767}; }
constexpr year&
operator++() noexcept
{
++_M_y;
return *this;
}
constexpr year
operator++(int) noexcept
{
auto __ret = *this;
++(*this);
return __ret;
}
constexpr year&
operator--() noexcept
{
--_M_y;
return *this;
}
constexpr year
operator--(int) noexcept
{
auto __ret = *this;
--(*this);
return __ret;
}
constexpr year&
operator+=(const years& __y) noexcept
{
*this = *this + __y;
return *this;
}
constexpr year&
operator-=(const years& __y) noexcept
{
*this = *this - __y;
return *this;
}
constexpr year
operator+() const noexcept
{ return *this; }
constexpr year
operator-() const noexcept
{ return year{-_M_y}; }
constexpr bool
is_leap() const noexcept
{
// Testing divisibility by 100 first gives better performance, that is,
// return (_M_y % 100 != 0 || _M_y % 400 == 0) && _M_y % 4 == 0;
// It gets even faster if _M_y is in [-536870800, 536870999]
// (which is the case here) and _M_y % 100 is replaced by
// __is_multiple_of_100 below.
// References:
// [1] https://github.com/cassioneri/calendar
// [2] https://accu.org/journals/overload/28/155/overload155.pdf#page=16
// Furthermore, if y%100 == 0, then y%400==0 is equivalent to y%16==0,
// so we can simplify it to (!mult_100 && y % 4 == 0) || y % 16 == 0,
// which is equivalent to (y & (mult_100 ? 15 : 3)) == 0.
// See https://gcc.gnu.org/pipermail/libstdc++/2021-June/052815.html
constexpr uint32_t __multiplier = 42949673;
constexpr uint32_t __bound = 42949669;
constexpr uint32_t __max_dividend = 1073741799;
constexpr uint32_t __offset = __max_dividend / 2 / 100 * 100;
const bool __is_multiple_of_100
= __multiplier * (_M_y + __offset) < __bound;
return (_M_y & (__is_multiple_of_100 ? 15 : 3)) == 0;
}
explicit constexpr
operator int() const noexcept
{ return _M_y; }
constexpr bool
ok() const noexcept
{ return min()._M_y <= _M_y && _M_y <= max()._M_y; }
friend constexpr bool
operator==(const year& __x, const year& __y) noexcept
{ return int{__x} == int{__y}; }
friend constexpr strong_ordering
operator<=>(const year& __x, const year& __y) noexcept
{ return int{__x} <=> int{__y}; }
friend constexpr year
operator+(const year& __x, const years& __y) noexcept
{ return year{int{__x} + static_cast<int>(__y.count())}; }
friend constexpr year
operator+(const years& __x, const year& __y) noexcept
{ return __y + __x; }
friend constexpr year
operator-(const year& __x, const years& __y) noexcept
{ return __x + -__y; }
friend constexpr years
operator-(const year& __x, const year& __y) noexcept
{ return years{int{__x} - int{__y}}; }
friend constexpr year_month
operator/(const year& __y, int __m) noexcept;
friend constexpr year_month_day
operator/(const year& __y, const month_day& __md) noexcept;
friend constexpr year_month_day
operator/(const month_day& __md, const year& __y) noexcept;
friend constexpr year_month_day_last
operator/(const year& __y, const month_day_last& __mdl) noexcept;
friend constexpr year_month_day_last
operator/(const month_day_last& __mdl, const year& __y) noexcept;
friend constexpr year_month_weekday
operator/(const year& __y, const month_weekday& __mwd) noexcept;
friend constexpr year_month_weekday
operator/(const month_weekday& __mwd, const year& __y) noexcept;
friend constexpr year_month_weekday_last
operator/(const year& __y, const month_weekday_last& __mwdl) noexcept;
friend constexpr year_month_weekday_last
operator/(const month_weekday_last& __mwdl, const year& __y) noexcept;
// TODO: Implement operator<<, to_stream, from_stream.
};
// WEEKDAY
class weekday
{
private:
unsigned char _M_wd;
static constexpr weekday
_S_from_days(const days& __d)
{
auto __n = __d.count();
return weekday(__n >= -4 ? (__n + 4) % 7 : (__n + 5) % 7 + 6);
}
public:
weekday() = default;
explicit constexpr
weekday(unsigned __wd) noexcept
: _M_wd(__wd == 7 ? 0 : __wd) // __wd % 7 ?
{ }
constexpr
weekday(const sys_days& __dp) noexcept
: weekday{_S_from_days(__dp.time_since_epoch())}
{ }
explicit constexpr
weekday(const local_days& __dp) noexcept
: weekday{sys_days{__dp.time_since_epoch()}}
{ }
constexpr weekday&
operator++() noexcept
{
*this += days{1};
return *this;
}
constexpr weekday
operator++(int) noexcept
{
auto __ret = *this;
++(*this);
return __ret;
}
constexpr weekday&
operator--() noexcept
{
*this -= days{1};
return *this;
}
constexpr weekday
operator--(int) noexcept
{
auto __ret = *this;
--(*this);
return __ret;
}
constexpr weekday&
operator+=(const days& __d) noexcept
{
*this = *this + __d;
return *this;
}
constexpr weekday&
operator-=(const days& __d) noexcept
{
*this = *this - __d;
return *this;
}
constexpr unsigned
c_encoding() const noexcept
{ return _M_wd; }
constexpr unsigned
iso_encoding() const noexcept
{ return _M_wd == 0u ? 7u : _M_wd; }
constexpr bool
ok() const noexcept
{ return _M_wd <= 6; }
constexpr weekday_indexed
operator[](unsigned __index) const noexcept;
constexpr weekday_last
operator[](last_spec) const noexcept;
friend constexpr bool
operator==(const weekday& __x, const weekday& __y) noexcept
{ return __x._M_wd == __y._M_wd; }
friend constexpr weekday
operator+(const weekday& __x, const days& __y) noexcept
{
auto __n = static_cast<long long>(__x._M_wd) + __y.count();
return weekday{__detail::__modulo(__n, 7)};
}
friend constexpr weekday
operator+(const days& __x, const weekday& __y) noexcept
{ return __y + __x; }
friend constexpr weekday
operator-(const weekday& __x, const days& __y) noexcept
{ return __x + -__y; }
friend constexpr days
operator-(const weekday& __x, const weekday& __y) noexcept
{
auto __n = static_cast<long long>(__x._M_wd) - __y._M_wd;
return days{__detail::__modulo(__n, 7)};
}
// TODO: operator<<, from_stream.
};
inline constexpr weekday Sunday{0};
inline constexpr weekday Monday{1};
inline constexpr weekday Tuesday{2};
inline constexpr weekday Wednesday{3};
inline constexpr weekday Thursday{4};
inline constexpr weekday Friday{5};
inline constexpr weekday Saturday{6};
// WEEKDAY_INDEXED
class weekday_indexed
{
private:
chrono::weekday _M_wd;
unsigned char _M_index;
public:
weekday_indexed() = default;
constexpr
weekday_indexed(const chrono::weekday& __wd, unsigned __index) noexcept
: _M_wd(__wd), _M_index(__index)
{ }
constexpr chrono::weekday
weekday() const noexcept
{ return _M_wd; }
constexpr unsigned
index() const noexcept
{ return _M_index; };
constexpr bool
ok() const noexcept
{ return _M_wd.ok() && 1 <= _M_index && _M_index <= 5; }
friend constexpr bool
operator==(const weekday_indexed& __x, const weekday_indexed& __y) noexcept
{ return __x.weekday() == __y.weekday() && __x.index() == __y.index(); }
friend constexpr month_weekday
operator/(const month& __m, const weekday_indexed& __wdi) noexcept;
friend constexpr month_weekday
operator/(int __m, const weekday_indexed& __wdi) noexcept;
friend constexpr month_weekday
operator/(const weekday_indexed& __wdi, const month& __m) noexcept;
friend constexpr month_weekday
operator/(const weekday_indexed& __wdi, int __m) noexcept;
friend constexpr year_month_weekday
operator/(const year_month& __ym, const weekday_indexed& __wdi) noexcept;
// TODO: Implement operator<<.
};
constexpr weekday_indexed
weekday::operator[](unsigned __index) const noexcept
{ return {*this, __index}; }
// WEEKDAY_LAST
class weekday_last
{
private:
chrono::weekday _M_wd;
public:
explicit constexpr
weekday_last(const chrono::weekday& __wd) noexcept
: _M_wd{__wd}
{ }
constexpr chrono::weekday
weekday() const noexcept
{ return _M_wd; }
constexpr bool
ok() const noexcept
{ return _M_wd.ok(); }
friend constexpr bool
operator==(const weekday_last& __x, const weekday_last& __y) noexcept
{ return __x.weekday() == __y.weekday(); }
friend constexpr month_weekday_last
operator/(int __m, const weekday_last& __wdl) noexcept;
friend constexpr month_weekday_last
operator/(const weekday_last& __wdl, int __m) noexcept;
friend constexpr year_month_weekday_last
operator/(const year_month& __ym, const weekday_last& __wdl) noexcept;
// TODO: Implement operator<<.
};
constexpr weekday_last
weekday::operator[](last_spec) const noexcept
{ return weekday_last{*this}; }
// MONTH_DAY
class month_day
{
private:
chrono::month _M_m;
chrono::day _M_d;
public:
month_day() = default;
constexpr
month_day(const chrono::month& __m, const chrono::day& __d) noexcept
: _M_m{__m}, _M_d{__d}
{ }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr chrono::day
day() const noexcept
{ return _M_d; }
constexpr bool
ok() const noexcept
{
return _M_m.ok()
&& 1u <= unsigned(_M_d)
&& unsigned(_M_d) <= __detail::__days_per_month[unsigned(_M_m) - 1];
}
friend constexpr bool
operator==(const month_day& __x, const month_day& __y) noexcept
{ return __x.month() == __y.month() && __x.day() == __y.day(); }
friend constexpr strong_ordering
operator<=>(const month_day& __x, const month_day& __y) noexcept
= default;
friend constexpr month_day
operator/(const chrono::month& __m, const chrono::day& __d) noexcept
{ return {__m, __d}; }
friend constexpr month_day
operator/(const chrono::month& __m, int __d) noexcept
{ return {__m, chrono::day(unsigned(__d))}; }
friend constexpr month_day
operator/(int __m, const chrono::day& __d) noexcept
{ return {chrono::month(unsigned(__m)), __d}; }
friend constexpr month_day
operator/(const chrono::day& __d, const chrono::month& __m) noexcept
{ return {__m, __d}; }
friend constexpr month_day
operator/(const chrono::day& __d, int __m) noexcept
{ return {chrono::month(unsigned(__m)), __d}; }
friend constexpr year_month_day
operator/(int __y, const month_day& __md) noexcept;
friend constexpr year_month_day
operator/(const month_day& __md, int __y) noexcept;
// TODO: Implement operator<<, from_stream.
};
// MONTH_DAY_LAST
class month_day_last
{
private:
chrono::month _M_m;
public:
explicit constexpr
month_day_last(const chrono::month& __m) noexcept
: _M_m{__m}
{ }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr bool
ok() const noexcept
{ return _M_m.ok(); }
friend constexpr bool
operator==(const month_day_last& __x, const month_day_last& __y) noexcept
{ return __x.month() == __y.month(); }
friend constexpr strong_ordering
operator<=>(const month_day_last& __x, const month_day_last& __y) noexcept
= default;
friend constexpr month_day_last
operator/(const chrono::month& __m, last_spec) noexcept
{ return month_day_last{__m}; }
friend constexpr month_day_last
operator/(int __m, last_spec) noexcept
{ return chrono::month(unsigned(__m)) / last; }
friend constexpr month_day_last
operator/(last_spec, const chrono::month& __m) noexcept
{ return __m / last; }
friend constexpr month_day_last
operator/(last_spec, int __m) noexcept
{ return __m / last; }
friend constexpr year_month_day_last
operator/(int __y, const month_day_last& __mdl) noexcept;
friend constexpr year_month_day_last
operator/(const month_day_last& __mdl, int __y) noexcept;
// TODO: Implement operator<<.
};
// MONTH_WEEKDAY
class month_weekday
{
private:
chrono::month _M_m;
chrono::weekday_indexed _M_wdi;
public:
constexpr
month_weekday(const chrono::month& __m,
const chrono::weekday_indexed& __wdi) noexcept
: _M_m{__m}, _M_wdi{__wdi}
{ }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr chrono::weekday_indexed
weekday_indexed() const noexcept
{ return _M_wdi; }
constexpr bool
ok() const noexcept
{ return _M_m.ok() && _M_wdi.ok(); }
friend constexpr bool
operator==(const month_weekday& __x, const month_weekday& __y) noexcept
{
return __x.month() == __y.month()
&& __x.weekday_indexed() == __y.weekday_indexed();
}
friend constexpr month_weekday
operator/(const chrono::month& __m,
const chrono::weekday_indexed& __wdi) noexcept
{ return {__m, __wdi}; }
friend constexpr month_weekday
operator/(int __m, const chrono::weekday_indexed& __wdi) noexcept
{ return chrono::month(unsigned(__m)) / __wdi; }
friend constexpr month_weekday
operator/(const chrono::weekday_indexed& __wdi,
const chrono::month& __m) noexcept
{ return __m / __wdi; }
friend constexpr month_weekday
operator/(const chrono::weekday_indexed& __wdi, int __m) noexcept
{ return __m / __wdi; }
friend constexpr year_month_weekday
operator/(int __y, const month_weekday& __mwd) noexcept;
friend constexpr year_month_weekday
operator/(const month_weekday& __mwd, int __y) noexcept;
// TODO: Implement operator<<.
};
// MONTH_WEEKDAY_LAST
class month_weekday_last
{
private:
chrono::month _M_m;
chrono::weekday_last _M_wdl;
public:
constexpr
month_weekday_last(const chrono::month& __m,
const chrono::weekday_last& __wdl) noexcept
:_M_m{__m}, _M_wdl{__wdl}
{ }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr chrono::weekday_last
weekday_last() const noexcept
{ return _M_wdl; }
constexpr bool
ok() const noexcept
{ return _M_m.ok() && _M_wdl.ok(); }
friend constexpr bool
operator==(const month_weekday_last& __x,
const month_weekday_last& __y) noexcept
{
return __x.month() == __y.month()
&& __x.weekday_last() == __y.weekday_last();
}
friend constexpr month_weekday_last
operator/(const chrono::month& __m,
const chrono::weekday_last& __wdl) noexcept
{ return {__m, __wdl}; }
friend constexpr month_weekday_last
operator/(int __m, const chrono::weekday_last& __wdl) noexcept
{ return chrono::month(unsigned(__m)) / __wdl; }
friend constexpr month_weekday_last
operator/(const chrono::weekday_last& __wdl,
const chrono::month& __m) noexcept
{ return __m / __wdl; }
friend constexpr month_weekday_last
operator/(const chrono::weekday_last& __wdl, int __m) noexcept
{ return chrono::month(unsigned(__m)) / __wdl; }
friend constexpr year_month_weekday_last
operator/(int __y, const month_weekday_last& __mwdl) noexcept;
friend constexpr year_month_weekday_last
operator/(const month_weekday_last& __mwdl, int __y) noexcept;
// TODO: Implement operator<<.
};
// YEAR_MONTH
namespace __detail
{
// [time.cal.ym], [time.cal.ymd], etc constrain the 'months'-based
// addition/subtraction operator overloads like so:
//
// Constraints: if the argument supplied by the caller for the months
// parameter is convertible to years, its implicit conversion sequence
// to years is worse than its implicit conversion sequence to months.
//
// We realize this constraint by templatizing the 'months'-based
// overloads (using a dummy defaulted template parameter), so that
// overload resolution doesn't select the 'months'-based overload unless
// the implicit conversion sequence to 'months' is better than that to
// 'years'.
using __months_years_conversion_disambiguator = void;
}
class year_month
{
private:
chrono::year _M_y;
chrono::month _M_m;
public:
year_month() = default;
constexpr
year_month(const chrono::year& __y, const chrono::month& __m) noexcept
: _M_y{__y}, _M_m{__m}
{ }
constexpr chrono::year
year() const noexcept
{ return _M_y; }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month&
operator+=(const months& __dm) noexcept
{
*this = *this + __dm;
return *this;
}
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month&
operator-=(const months& __dm) noexcept
{
*this = *this - __dm;
return *this;
}
constexpr year_month&
operator+=(const years& __dy) noexcept
{
*this = *this + __dy;
return *this;
}
constexpr year_month&
operator-=(const years& __dy) noexcept
{
*this = *this - __dy;
return *this;
}
constexpr bool
ok() const noexcept
{ return _M_y.ok() && _M_m.ok(); }
friend constexpr bool
operator==(const year_month& __x, const year_month& __y) noexcept
{ return __x.year() == __y.year() && __x.month() == __y.month(); }
friend constexpr strong_ordering
operator<=>(const year_month& __x, const year_month& __y) noexcept
= default;
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month
operator+(const year_month& __ym, const months& __dm) noexcept
{
// TODO: Optimize?
auto __m = __ym.month() + __dm;
auto __i = int(unsigned(__ym.month())) - 1 + __dm.count();
auto __y = (__i < 0
? __ym.year() + years{(__i - 11) / 12}
: __ym.year() + years{__i / 12});
return __y / __m;
}
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month
operator+(const months& __dm, const year_month& __ym) noexcept
{ return __ym + __dm; }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month
operator-(const year_month& __ym, const months& __dm) noexcept
{ return __ym + -__dm; }
friend constexpr months
operator-(const year_month& __x, const year_month& __y) noexcept
{
return (__x.year() - __y.year()
+ months{static_cast<int>(unsigned{__x.month()})
- static_cast<int>(unsigned{__y.month()})});
}
friend constexpr year_month
operator+(const year_month& __ym, const years& __dy) noexcept
{ return (__ym.year() + __dy) / __ym.month(); }
friend constexpr year_month
operator+(const years& __dy, const year_month& __ym) noexcept
{ return __ym + __dy; }
friend constexpr year_month
operator-(const year_month& __ym, const years& __dy) noexcept
{ return __ym + -__dy; }
friend constexpr year_month
operator/(const chrono::year& __y, const chrono::month& __m) noexcept
{ return {__y, __m}; }
friend constexpr year_month
operator/(const chrono::year& __y, int __m) noexcept
{ return {__y, chrono::month(unsigned(__m))}; }
friend constexpr year_month_day
operator/(const year_month& __ym, int __d) noexcept;
friend constexpr year_month_day_last
operator/(const year_month& __ym, last_spec) noexcept;
// TODO: Implement operator<<, from_stream.
};
// YEAR_MONTH_DAY
class year_month_day
{
private:
chrono::year _M_y;
chrono::month _M_m;
chrono::day _M_d;
static constexpr year_month_day _S_from_days(const days& __dp) noexcept;
constexpr days _M_days_since_epoch() const noexcept;
public:
year_month_day() = default;
constexpr
year_month_day(const chrono::year& __y, const chrono::month& __m,
const chrono::day& __d) noexcept
: _M_y{__y}, _M_m{__m}, _M_d{__d}
{ }
constexpr
year_month_day(const year_month_day_last& __ymdl) noexcept;
constexpr
year_month_day(const sys_days& __dp) noexcept
: year_month_day(_S_from_days(__dp.time_since_epoch()))
{ }
explicit constexpr
year_month_day(const local_days& __dp) noexcept
: year_month_day(sys_days{__dp.time_since_epoch()})
{ }
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_day&
operator+=(const months& __m) noexcept
{
*this = *this + __m;
return *this;
}
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_day&
operator-=(const months& __m) noexcept
{
*this = *this - __m;
return *this;
}
constexpr year_month_day&
operator+=(const years& __y) noexcept
{
*this = *this + __y;
return *this;
}
constexpr year_month_day&
operator-=(const years& __y) noexcept
{
*this = *this - __y;
return *this;
}
constexpr chrono::year
year() const noexcept
{ return _M_y; }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr chrono::day
day() const noexcept
{ return _M_d; }
constexpr
operator sys_days() const noexcept
{ return sys_days{_M_days_since_epoch()}; }
explicit constexpr
operator local_days() const noexcept
{ return local_days{sys_days{*this}.time_since_epoch()}; }
constexpr bool ok() const noexcept;
friend constexpr bool
operator==(const year_month_day& __x, const year_month_day& __y) noexcept
{
return __x.year() == __y.year()
&& __x.month() == __y.month()
&& __x.day() == __y.day();
}
friend constexpr strong_ordering
operator<=>(const year_month_day& __x, const year_month_day& __y) noexcept
= default;
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_day
operator+(const year_month_day& __ymd, const months& __dm) noexcept
{ return (__ymd.year() / __ymd.month() + __dm) / __ymd.day(); }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_day
operator+(const months& __dm, const year_month_day& __ymd) noexcept
{ return __ymd + __dm; }
friend constexpr year_month_day
operator+(const year_month_day& __ymd, const years& __dy) noexcept
{ return (__ymd.year() + __dy) / __ymd.month() / __ymd.day(); }
friend constexpr year_month_day
operator+(const years& __dy, const year_month_day& __ymd) noexcept
{ return __ymd + __dy; }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_day
operator-(const year_month_day& __ymd, const months& __dm) noexcept
{ return __ymd + -__dm; }
friend constexpr year_month_day
operator-(const year_month_day& __ymd, const years& __dy) noexcept
{ return __ymd + -__dy; }
friend constexpr year_month_day
operator/(const year_month& __ym, const chrono::day& __d) noexcept
{ return {__ym.year(), __ym.month(), __d}; }
friend constexpr year_month_day
operator/(const year_month& __ym, int __d) noexcept
{ return __ym / chrono::day{unsigned(__d)}; }
friend constexpr year_month_day
operator/(const chrono::year& __y, const month_day& __md) noexcept
{ return __y / __md.month() / __md.day(); }
friend constexpr year_month_day
operator/(int __y, const month_day& __md) noexcept
{ return chrono::year{__y} / __md; }
friend constexpr year_month_day
operator/(const month_day& __md, const chrono::year& __y) noexcept
{ return __y / __md; }
friend constexpr year_month_day
operator/(const month_day& __md, int __y) noexcept
{ return chrono::year(__y) / __md; }
// TODO: Implement operator<<, from_stream.
};
// Construct from days since 1970/01/01.
// Proposition 6.3 of Neri and Schneider,
// "Euclidean Affine Functions and Applications to Calendar Algorithms".
// https://arxiv.org/abs/2102.06959
constexpr year_month_day
year_month_day::_S_from_days(const days& __dp) noexcept
{
constexpr auto __z2 = static_cast<uint32_t>(-1468000);
constexpr auto __r2_e3 = static_cast<uint32_t>(536895458);
const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3;
const auto __n1 = 4 * __r0 + 3;
const auto __q1 = __n1 / 146097;
const auto __r1 = __n1 % 146097 / 4;
constexpr auto __p32 = static_cast<uint64_t>(1) << 32;
const auto __n2 = 4 * __r1 + 3;
const auto __u2 = static_cast<uint64_t>(2939745) * __n2;
const auto __q2 = static_cast<uint32_t>(__u2 / __p32);
const auto __r2 = static_cast<uint32_t>(__u2 % __p32) / 2939745 / 4;
constexpr auto __p16 = static_cast<uint32_t>(1) << 16;
const auto __n3 = 2141 * __r2 + 197913;
const auto __q3 = __n3 / __p16;
const auto __r3 = __n3 % __p16 / 2141;
const auto __y0 = 100 * __q1 + __q2;
const auto __m0 = __q3;
const auto __d0 = __r3;
const auto __j = __r2 >= 306;
const auto __y1 = __y0 + __j;
const auto __m1 = __j ? __m0 - 12 : __m0;
const auto __d1 = __d0 + 1;
return year_month_day{chrono::year{static_cast<int>(__y1 + __z2)},
chrono::month{__m1}, chrono::day{__d1}};
}
// Days since 1970/01/01.
// Proposition 6.2 of Neri and Schneider,
// "Euclidean Affine Functions and Applications to Calendar Algorithms".
// https://arxiv.org/abs/2102.06959
constexpr days
year_month_day::_M_days_since_epoch() const noexcept
{
auto constexpr __z2 = static_cast<uint32_t>(-1468000);
auto constexpr __r2_e3 = static_cast<uint32_t>(536895458);
const auto __y1 = static_cast<uint32_t>(static_cast<int>(_M_y)) - __z2;
const auto __m1 = static_cast<uint32_t>(static_cast<unsigned>(_M_m));
const auto __d1 = static_cast<uint32_t>(static_cast<unsigned>(_M_d));
const auto __j = static_cast<uint32_t>(__m1 < 3);
const auto __y0 = __y1 - __j;
const auto __m0 = __j ? __m1 + 12 : __m1;
const auto __d0 = __d1 - 1;
const auto __q1 = __y0 / 100;
const auto __yc = 1461 * __y0 / 4 - __q1 + __q1 / 4;
const auto __mc = (979 *__m0 - 2919) / 32;
const auto __dc = __d0;
return days{static_cast<int32_t>(__yc + __mc + __dc - __r2_e3)};
}
// YEAR_MONTH_DAY_LAST
class year_month_day_last
{
private:
chrono::year _M_y;
chrono::month_day_last _M_mdl;
public:
constexpr
year_month_day_last(const chrono::year& __y,
const chrono::month_day_last& __mdl) noexcept
: _M_y{__y}, _M_mdl{__mdl}
{ }
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_day_last&
operator+=(const months& __m) noexcept
{
*this = *this + __m;
return *this;
}
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_day_last&
operator-=(const months& __m) noexcept
{
*this = *this - __m;
return *this;
}
constexpr year_month_day_last&
operator+=(const years& __y) noexcept
{
*this = *this + __y;
return *this;
}
constexpr year_month_day_last&
operator-=(const years& __y) noexcept
{
*this = *this - __y;
return *this;
}
constexpr chrono::year
year() const noexcept
{ return _M_y; }
constexpr chrono::month
month() const noexcept
{ return _M_mdl.month(); }
constexpr chrono::month_day_last
month_day_last() const noexcept
{ return _M_mdl; }
// Return A day representing the last day of this year, month pair.
constexpr chrono::day
day() const noexcept
{
const auto __m = static_cast<unsigned>(month());
// Excluding February, the last day of month __m is either 30 or 31 or,
// in another words, it is 30 + b = 30 | b, where b is in {0, 1}.
// If __m in {1, 3, 4, 5, 6, 7}, then b is 1 if, and only if __m is odd.
// Hence, b = __m & 1 = (__m ^ 0) & 1.
// If __m in {8, 9, 10, 11, 12}, then b is 1 if, and only if __m is even.
// Hence, b = (__m ^ 1) & 1.
// Therefore, b = (__m ^ c) & 1, where c = 0, if __m < 8, or c = 1 if
// __m >= 8, that is, c = __m >> 3.
// The above mathematically justifies this implementation whose
// performance does not depend on look-up tables being on the L1 cache.
return chrono::day{__m != 2 ? ((__m ^ (__m >> 3)) & 1) | 30
: _M_y.is_leap() ? 29 : 28};
}
constexpr
operator sys_days() const noexcept
{ return sys_days{year() / month() / day()}; }
explicit constexpr
operator local_days() const noexcept
{ return local_days{sys_days{*this}.time_since_epoch()}; }
constexpr bool
ok() const noexcept
{ return _M_y.ok() && _M_mdl.ok(); }
friend constexpr bool
operator==(const year_month_day_last& __x,
const year_month_day_last& __y) noexcept
{
return __x.year() == __y.year()
&& __x.month_day_last() == __y.month_day_last();
}
friend constexpr strong_ordering
operator<=>(const year_month_day_last& __x,
const year_month_day_last& __y) noexcept
= default;
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_day_last
operator+(const year_month_day_last& __ymdl,
const months& __dm) noexcept
{ return (__ymdl.year() / __ymdl.month() + __dm) / last; }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_day_last
operator+(const months& __dm,
const year_month_day_last& __ymdl) noexcept
{ return __ymdl + __dm; }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_day_last
operator-(const year_month_day_last& __ymdl,
const months& __dm) noexcept
{ return __ymdl + -__dm; }
friend constexpr year_month_day_last
operator+(const year_month_day_last& __ymdl,
const years& __dy) noexcept
{ return {__ymdl.year() + __dy, __ymdl.month_day_last()}; }
friend constexpr year_month_day_last
operator+(const years& __dy,
const year_month_day_last& __ymdl) noexcept
{ return __ymdl + __dy; }
friend constexpr year_month_day_last
operator-(const year_month_day_last& __ymdl,
const years& __dy) noexcept
{ return __ymdl + -__dy; }
friend constexpr year_month_day_last
operator/(const year_month& __ym, last_spec) noexcept
{ return {__ym.year(), chrono::month_day_last{__ym.month()}}; }
friend constexpr year_month_day_last
operator/(const chrono::year& __y,
const chrono::month_day_last& __mdl) noexcept
{ return {__y, __mdl}; }
friend constexpr year_month_day_last
operator/(int __y, const chrono::month_day_last& __mdl) noexcept
{ return chrono::year(__y) / __mdl; }
friend constexpr year_month_day_last
operator/(const chrono::month_day_last& __mdl,
const chrono::year& __y) noexcept
{ return __y / __mdl; }
friend constexpr year_month_day_last
operator/(const chrono::month_day_last& __mdl, int __y) noexcept
{ return chrono::year(__y) / __mdl; }
// TODO: Implement operator<<.
};
// year_month_day ctor from year_month_day_last
constexpr
year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept
: _M_y{__ymdl.year()}, _M_m{__ymdl.month()}, _M_d{__ymdl.day()}
{ }
constexpr bool
year_month_day::ok() const noexcept
{
if (!_M_y.ok() || !_M_m.ok())
return false;
return chrono::day{1} <= _M_d && _M_d <= (_M_y / _M_m / last).day();
}
// YEAR_MONTH_WEEKDAY
class year_month_weekday
{
private:
chrono::year _M_y;
chrono::month _M_m;
chrono::weekday_indexed _M_wdi;
static constexpr year_month_weekday
_S_from_sys_days(const sys_days& __dp)
{
year_month_day __ymd{__dp};
chrono::weekday __wd{__dp};
auto __index = __wd[(unsigned{__ymd.day()} - 1) / 7 + 1];
return {__ymd.year(), __ymd.month(), __index};
}
public:
year_month_weekday() = default;
constexpr
year_month_weekday(const chrono::year& __y, const chrono::month& __m,
const chrono::weekday_indexed& __wdi) noexcept
: _M_y{__y}, _M_m{__m}, _M_wdi{__wdi}
{ }
constexpr
year_month_weekday(const sys_days& __dp) noexcept
: year_month_weekday{_S_from_sys_days(__dp)}
{ }
explicit constexpr
year_month_weekday(const local_days& __dp) noexcept
: year_month_weekday{sys_days{__dp.time_since_epoch()}}
{ }
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_weekday&
operator+=(const months& __m) noexcept
{
*this = *this + __m;
return *this;
}
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_weekday&
operator-=(const months& __m) noexcept
{
*this = *this - __m;
return *this;
}
constexpr year_month_weekday&
operator+=(const years& __y) noexcept
{
*this = *this + __y;
return *this;
}
constexpr year_month_weekday&
operator-=(const years& __y) noexcept
{
*this = *this - __y;
return *this;
}
constexpr chrono::year
year() const noexcept
{ return _M_y; }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr chrono::weekday
weekday() const noexcept
{ return _M_wdi.weekday(); }
constexpr unsigned
index() const noexcept
{ return _M_wdi.index(); }
constexpr chrono::weekday_indexed
weekday_indexed() const noexcept
{ return _M_wdi; }
constexpr
operator sys_days() const noexcept
{
auto __d = sys_days{year() / month() / 1};
return __d + (weekday() - chrono::weekday(__d)
+ days{(static_cast<int>(index())-1)*7});
}
explicit constexpr
operator local_days() const noexcept
{ return local_days{sys_days{*this}.time_since_epoch()}; }
constexpr bool
ok() const noexcept
{
if (!_M_y.ok() || !_M_m.ok() || !_M_wdi.ok())
return false;
if (_M_wdi.index() <= 4)
return true;
days __d = (_M_wdi.weekday()
- chrono::weekday{sys_days{_M_y / _M_m / 1}}
+ days((_M_wdi.index()-1)*7 + 1));
__glibcxx_assert(__d.count() >= 1);
return __d.count() <= unsigned{(_M_y / _M_m / last).day()};
}
friend constexpr bool
operator==(const year_month_weekday& __x,
const year_month_weekday& __y) noexcept
{
return __x.year() == __y.year()
&& __x.month() == __y.month()
&& __x.weekday_indexed() == __y.weekday_indexed();
}
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_weekday
operator+(const year_month_weekday& __ymwd, const months& __dm) noexcept
{
return ((__ymwd.year() / __ymwd.month() + __dm)
/ __ymwd.weekday_indexed());
}
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_weekday
operator+(const months& __dm, const year_month_weekday& __ymwd) noexcept
{ return __ymwd + __dm; }
friend constexpr year_month_weekday
operator+(const year_month_weekday& __ymwd, const years& __dy) noexcept
{ return {__ymwd.year() + __dy, __ymwd.month(), __ymwd.weekday_indexed()}; }
friend constexpr year_month_weekday
operator+(const years& __dy, const year_month_weekday& __ymwd) noexcept
{ return __ymwd + __dy; }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_weekday
operator-(const year_month_weekday& __ymwd, const months& __dm) noexcept
{ return __ymwd + -__dm; }
friend constexpr year_month_weekday
operator-(const year_month_weekday& __ymwd, const years& __dy) noexcept
{ return __ymwd + -__dy; }
friend constexpr year_month_weekday
operator/(const year_month& __ym,
const chrono::weekday_indexed& __wdi) noexcept
{ return {__ym.year(), __ym.month(), __wdi}; }
friend constexpr year_month_weekday
operator/(const chrono::year& __y, const month_weekday& __mwd) noexcept
{ return {__y, __mwd.month(), __mwd.weekday_indexed()}; }
friend constexpr year_month_weekday
operator/(int __y, const month_weekday& __mwd) noexcept
{ return chrono::year(__y) / __mwd; }
friend constexpr year_month_weekday
operator/(const month_weekday& __mwd, const chrono::year& __y) noexcept
{ return __y / __mwd; }
friend constexpr year_month_weekday
operator/(const month_weekday& __mwd, int __y) noexcept
{ return chrono::year(__y) / __mwd; }
// TODO: Implement operator<<.
};
// YEAR_MONTH_WEEKDAY_LAST
class year_month_weekday_last
{
private:
chrono::year _M_y;
chrono::month _M_m;
chrono::weekday_last _M_wdl;
public:
constexpr
year_month_weekday_last(const chrono::year& __y, const chrono::month& __m,
const chrono::weekday_last& __wdl) noexcept
: _M_y{__y}, _M_m{__m}, _M_wdl{__wdl}
{ }
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_weekday_last&
operator+=(const months& __m) noexcept
{
*this = *this + __m;
return *this;
}
template<typename = __detail::__months_years_conversion_disambiguator>
constexpr year_month_weekday_last&
operator-=(const months& __m) noexcept
{
*this = *this - __m;
return *this;
}
constexpr year_month_weekday_last&
operator+=(const years& __y) noexcept
{
*this = *this + __y;
return *this;
}
constexpr year_month_weekday_last&
operator-=(const years& __y) noexcept
{
*this = *this - __y;
return *this;
}
constexpr chrono::year
year() const noexcept
{ return _M_y; }
constexpr chrono::month
month() const noexcept
{ return _M_m; }
constexpr chrono::weekday
weekday() const noexcept
{ return _M_wdl.weekday(); }
constexpr chrono::weekday_last
weekday_last() const noexcept
{ return _M_wdl; }
constexpr
operator sys_days() const noexcept
{
const auto __d = sys_days{_M_y / _M_m / last};
return sys_days{(__d - (chrono::weekday{__d}
- _M_wdl.weekday())).time_since_epoch()};
}
explicit constexpr
operator local_days() const noexcept
{ return local_days{sys_days{*this}.time_since_epoch()}; }
constexpr bool
ok() const noexcept
{ return _M_y.ok() && _M_m.ok() && _M_wdl.ok(); }
friend constexpr bool
operator==(const year_month_weekday_last& __x,
const year_month_weekday_last& __y) noexcept
{
return __x.year() == __y.year()
&& __x.month() == __y.month()
&& __x.weekday_last() == __y.weekday_last();
}
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_weekday_last
operator+(const year_month_weekday_last& __ymwdl,
const months& __dm) noexcept
{
return ((__ymwdl.year() / __ymwdl.month() + __dm)
/ __ymwdl.weekday_last());
}
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_weekday_last
operator+(const months& __dm,
const year_month_weekday_last& __ymwdl) noexcept
{ return __ymwdl + __dm; }
friend constexpr year_month_weekday_last
operator+(const year_month_weekday_last& __ymwdl,
const years& __dy) noexcept
{ return {__ymwdl.year() + __dy, __ymwdl.month(), __ymwdl.weekday_last()}; }
friend constexpr year_month_weekday_last
operator+(const years& __dy,
const year_month_weekday_last& __ymwdl) noexcept
{ return __ymwdl + __dy; }
template<typename = __detail::__months_years_conversion_disambiguator>
friend constexpr year_month_weekday_last
operator-(const year_month_weekday_last& __ymwdl,
const months& __dm) noexcept
{ return __ymwdl + -__dm; }
friend constexpr year_month_weekday_last
operator-(const year_month_weekday_last& __ymwdl,
const years& __dy) noexcept
{ return __ymwdl + -__dy; }
friend constexpr year_month_weekday_last
operator/(const year_month& __ym,
const chrono::weekday_last& __wdl) noexcept
{ return {__ym.year(), __ym.month(), __wdl}; }
friend constexpr year_month_weekday_last
operator/(const chrono::year& __y,
const chrono::month_weekday_last& __mwdl) noexcept
{ return {__y, __mwdl.month(), __mwdl.weekday_last()}; }
friend constexpr year_month_weekday_last
operator/(int __y, const chrono::month_weekday_last& __mwdl) noexcept
{ return chrono::year(__y) / __mwdl; }
friend constexpr year_month_weekday_last
operator/(const chrono::month_weekday_last& __mwdl,
const chrono::year& __y) noexcept
{ return __y / __mwdl; }
friend constexpr year_month_weekday_last
operator/(const chrono::month_weekday_last& __mwdl, int __y) noexcept
{ return chrono::year(__y) / __mwdl; }
// TODO: Implement operator<<.
};
// HH_MM_SS
namespace __detail
{
consteval long long
__pow10(unsigned __n)
{
long long __r = 1;
while (__n-- > 0)
__r *= 10;
return __r;
}
}
template<typename _Duration>
class hh_mm_ss
{
private:
static constexpr int
_S_fractional_width()
{
int __multiplicity_2 = 0;
int __multiplicity_5 = 0;
auto __den = _Duration::period::den;
while ((__den % 2) == 0)
{
++__multiplicity_2;
__den /= 2;
}
while ((__den % 5) == 0)
{
++__multiplicity_5;
__den /= 5;
}
if (__den != 1)
return 6;
int __width = (__multiplicity_2 > __multiplicity_5
? __multiplicity_2 : __multiplicity_5);
if (__width > 18)
__width = 18;
return __width;
}
constexpr
hh_mm_ss(_Duration __d, bool __is_neg)
: _M_is_neg(__is_neg),
_M_h (duration_cast<chrono::hours>(__d)),
_M_m (duration_cast<chrono::minutes>(__d - hours())),
_M_s (duration_cast<chrono::seconds>(__d - hours() - minutes()))
{
auto __ss = __d - hours() - minutes() - seconds();
if constexpr (treat_as_floating_point_v<typename precision::rep>)
_M_ss = __ss;
else
_M_ss = duration_cast<precision>(__ss);
}
static constexpr _Duration
_S_abs(_Duration __d)
{
if constexpr (numeric_limits<typename _Duration::rep>::is_signed)
return chrono::abs(__d);
else
return __d;
}
public:
static constexpr unsigned fractional_width = {_S_fractional_width()};
using precision
= duration<common_type_t<typename _Duration::rep,
chrono::seconds::rep>,
ratio<1, __detail::__pow10(fractional_width)>>;
constexpr
hh_mm_ss() noexcept
: hh_mm_ss{_Duration::zero()}
{ }
constexpr explicit
hh_mm_ss(_Duration __d)
: hh_mm_ss(_S_abs(__d), __d < _Duration::zero())
{ }
constexpr bool
is_negative() const noexcept
{ return _M_is_neg; }
constexpr chrono::hours
hours() const noexcept
{ return _M_h; }
constexpr chrono::minutes
minutes() const noexcept
{ return _M_m; }
constexpr chrono::seconds
seconds() const noexcept
{ return _M_s; }
constexpr precision
subseconds() const noexcept
{ return _M_ss; }
constexpr explicit
operator precision() const noexcept
{ return to_duration(); }
constexpr precision
to_duration() const noexcept
{
if (_M_is_neg)
return -(_M_h + _M_m + _M_s + _M_ss);
else
return _M_h + _M_m + _M_s + _M_ss;
}
// TODO: Implement operator<<.
private:
bool _M_is_neg;
chrono::hours _M_h;
chrono::minutes _M_m;
chrono::seconds _M_s;
precision _M_ss;
};
// 12/24 HOURS FUNCTIONS
constexpr bool
is_am(const hours& __h) noexcept
{ return 0h <= __h && __h <= 11h; }
constexpr bool
is_pm(const hours& __h) noexcept
{ return 12h <= __h && __h <= 23h; }
constexpr hours
make12(const hours& __h) noexcept
{
if (__h == 0h)
return 12h;
else if (__h > 12h)
return __h - 12h;
return __h;
}
constexpr hours
make24(const hours& __h, bool __is_pm) noexcept
{
if (!__is_pm)
{
if (__h == 12h)
return 0h;
else
return __h;
}
else
{
if (__h == 12h)
return __h;
else
return __h + 12h;
}
}
/// @} group chrono
#endif // C++20
} // namespace chrono
#if __cplusplus >= 202002L
inline namespace literals
{
inline namespace chrono_literals
{
/// @addtogroup chrono
/// @{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wliteral-suffix"
/// Literal suffix for creating chrono::day objects.
/// @since C++20
constexpr chrono::day
operator""d(unsigned long long __d) noexcept
{ return chrono::day{static_cast<unsigned>(__d)}; }
/// Literal suffix for creating chrono::year objects.
/// @since C++20
constexpr chrono::year
operator""y(unsigned long long __y) noexcept
{ return chrono::year{static_cast<int>(__y)}; }
#pragma GCC diagnostic pop
/// @}
} // inline namespace chrono_literals
} // inline namespace literals
namespace chrono
{
/// @addtogroup chrono
/// @{
/// @cond undocumented
namespace __detail
{
template<typename _Period>
const char*
__units_suffix_misc(char* __buf, size_t __n) noexcept
{
namespace __tc = std::__detail;
char* __p = __buf;
__p[0] = '[';
unsigned __nlen = __tc::__to_chars_len((uintmax_t)_Period::num);
__tc::__to_chars_10_impl(__p + 1, __nlen, (uintmax_t)_Period::num);
__p += 1 + __nlen;
if constexpr (_Period::den != 1)
{
__p[0] = '/';
unsigned __dlen = __tc::__to_chars_len((uintmax_t)_Period::den);
__tc::__to_chars_10_impl(__p + 1, __dlen, (uintmax_t)_Period::den);
__p += 1 + __dlen;
}
__p[0] = ']';
__p[1] = 's';
__p[2] = '\0';
return __buf;
}
template<typename _Period, typename _CharT>
auto
__units_suffix(char* __buf, size_t __n) noexcept
{
#define _GLIBCXX_UNITS_SUFFIX(period, suffix) \
if constexpr (is_same_v<_Period, period>) \
{ \
if constexpr (is_same_v<_CharT, wchar_t>) \
return L##suffix; \
else \
return suffix; \
} \
else
_GLIBCXX_UNITS_SUFFIX(atto, "as")
_GLIBCXX_UNITS_SUFFIX(femto, "fs")
_GLIBCXX_UNITS_SUFFIX(pico, "ps")
_GLIBCXX_UNITS_SUFFIX(nano, "ns")
_GLIBCXX_UNITS_SUFFIX(micro, "\u00b5s")
_GLIBCXX_UNITS_SUFFIX(milli, "ms")
_GLIBCXX_UNITS_SUFFIX(centi, "cs")
_GLIBCXX_UNITS_SUFFIX(deci, "ds")
_GLIBCXX_UNITS_SUFFIX(ratio<1>, "s")
_GLIBCXX_UNITS_SUFFIX(deca, "das")
_GLIBCXX_UNITS_SUFFIX(hecto, "hs")
_GLIBCXX_UNITS_SUFFIX(kilo, "ks")
_GLIBCXX_UNITS_SUFFIX(mega, "Ms")
_GLIBCXX_UNITS_SUFFIX(giga, "Gs")
_GLIBCXX_UNITS_SUFFIX(tera, "Ts")
_GLIBCXX_UNITS_SUFFIX(tera, "Ts")
_GLIBCXX_UNITS_SUFFIX(peta, "Ps")
_GLIBCXX_UNITS_SUFFIX(exa, "Es")
_GLIBCXX_UNITS_SUFFIX(ratio<60>, "min")
_GLIBCXX_UNITS_SUFFIX(ratio<3600>, "h")
_GLIBCXX_UNITS_SUFFIX(ratio<86400>, "d")
#undef _GLIBCXX_UNITS_SUFFIX
return __detail::__units_suffix_misc<_Period>(__buf, __n);
}
} // namespace __detail
/// @endcond
template<typename _CharT, typename _Traits,
typename _Rep, typename _Period>
inline basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
const duration<_Rep, _Period>& __d)
{
using period = typename _Period::type;
char __buf[sizeof("[/]s") + 2 * numeric_limits<intmax_t>::digits10];
std::basic_ostringstream<_CharT, _Traits> __s;
__s.flags(__os.flags());
__s.imbue(__os.getloc());
__s.precision(__os.precision());
__s << __d.count();
__s << __detail::__units_suffix<period, _CharT>(__buf, sizeof(__buf));
__os << std::move(__s).str();
return __os;
}
// TODO: from_stream for duration
/// @} group chrono
} // namespace chrono
#endif // C++20
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++11
#endif //_GLIBCXX_CHRONO