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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___CHRONO_WEEKDAY_H
#define _LIBCPP___CHRONO_WEEKDAY_H
#include <__chrono/calendar.h>
#include <__chrono/duration.h>
#include <__chrono/system_clock.h>
#include <__chrono/time_point.h>
#include <__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
namespace chrono
{
class weekday_indexed;
class weekday_last;
class weekday {
private:
unsigned char __wd_;
_LIBCPP_HIDE_FROM_ABI static constexpr unsigned char __weekday_from_days(int __days) noexcept;
public:
weekday() = default;
_LIBCPP_HIDE_FROM_ABI inline explicit constexpr weekday(unsigned __val) noexcept : __wd_(static_cast<unsigned char>(__val == 7 ? 0 : __val)) {}
_LIBCPP_HIDE_FROM_ABI inline constexpr weekday(const sys_days& __sysd) noexcept
: __wd_(__weekday_from_days(__sysd.time_since_epoch().count())) {}
_LIBCPP_HIDE_FROM_ABI inline explicit constexpr weekday(const local_days& __locd) noexcept
: __wd_(__weekday_from_days(__locd.time_since_epoch().count())) {}
_LIBCPP_HIDE_FROM_ABI inline constexpr weekday& operator++() noexcept { __wd_ = (__wd_ == 6 ? 0 : __wd_ + 1); return *this; }
_LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator++(int) noexcept { weekday __tmp = *this; ++(*this); return __tmp; }
_LIBCPP_HIDE_FROM_ABI inline constexpr weekday& operator--() noexcept { __wd_ = (__wd_ == 0 ? 6 : __wd_ - 1); return *this; }
_LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator--(int) noexcept { weekday __tmp = *this; --(*this); return __tmp; }
_LIBCPP_HIDE_FROM_ABI constexpr weekday& operator+=(const days& __dd) noexcept;
_LIBCPP_HIDE_FROM_ABI constexpr weekday& operator-=(const days& __dd) noexcept;
_LIBCPP_HIDE_FROM_ABI inline constexpr unsigned c_encoding() const noexcept { return __wd_; }
_LIBCPP_HIDE_FROM_ABI inline constexpr unsigned iso_encoding() const noexcept { return __wd_ == 0u ? 7 : __wd_; }
_LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __wd_ <= 6; }
_LIBCPP_HIDE_FROM_ABI constexpr weekday_indexed operator[](unsigned __index) const noexcept;
_LIBCPP_HIDE_FROM_ABI constexpr weekday_last operator[](last_spec) const noexcept;
};
// https://howardhinnant.github.io/date_algorithms.html#weekday_from_days
_LIBCPP_HIDE_FROM_ABI inline constexpr
unsigned char weekday::__weekday_from_days(int __days) noexcept
{
return static_cast<unsigned char>(
static_cast<unsigned>(__days >= -4 ? (__days+4) % 7 : (__days+5) % 7 + 6)
);
}
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator==(const weekday& __lhs, const weekday& __rhs) noexcept
{ return __lhs.c_encoding() == __rhs.c_encoding(); }
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator< (const weekday& __lhs, const weekday& __rhs) noexcept
{ return __lhs.c_encoding() < __rhs.c_encoding(); }
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator> (const weekday& __lhs, const weekday& __rhs) noexcept
{ return __rhs < __lhs; }
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator<=(const weekday& __lhs, const weekday& __rhs) noexcept
{ return !(__rhs < __lhs);}
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator>=(const weekday& __lhs, const weekday& __rhs) noexcept
{ return !(__lhs < __rhs); }
_LIBCPP_HIDE_FROM_ABI constexpr
weekday operator+(const weekday& __lhs, const days& __rhs) noexcept
{
auto const __mu = static_cast<long long>(__lhs.c_encoding()) + __rhs.count();
auto const __yr = (__mu >= 0 ? __mu : __mu - 6) / 7;
return weekday{static_cast<unsigned>(__mu - __yr * 7)};
}
_LIBCPP_HIDE_FROM_ABI constexpr
weekday operator+(const days& __lhs, const weekday& __rhs) noexcept
{ return __rhs + __lhs; }
_LIBCPP_HIDE_FROM_ABI constexpr
weekday operator-(const weekday& __lhs, const days& __rhs) noexcept
{ return __lhs + -__rhs; }
_LIBCPP_HIDE_FROM_ABI constexpr
days operator-(const weekday& __lhs, const weekday& __rhs) noexcept
{
const int __wdu = __lhs.c_encoding() - __rhs.c_encoding();
const int __wk = (__wdu >= 0 ? __wdu : __wdu-6) / 7;
return days{__wdu - __wk * 7};
}
_LIBCPP_HIDE_FROM_ABI inline constexpr
weekday& weekday::operator+=(const days& __dd) noexcept
{ *this = *this + __dd; return *this; }
_LIBCPP_HIDE_FROM_ABI inline constexpr
weekday& weekday::operator-=(const days& __dd) noexcept
{ *this = *this - __dd; return *this; }
class weekday_indexed {
private:
chrono::weekday __wd_;
unsigned char __idx_;
public:
weekday_indexed() = default;
_LIBCPP_HIDE_FROM_ABI inline constexpr weekday_indexed(const chrono::weekday& __wdval, unsigned __idxval) noexcept
: __wd_{__wdval}, __idx_(__idxval) {}
_LIBCPP_HIDE_FROM_ABI inline constexpr chrono::weekday weekday() const noexcept { return __wd_; }
_LIBCPP_HIDE_FROM_ABI inline constexpr unsigned index() const noexcept { return __idx_; }
_LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __wd_.ok() && __idx_ >= 1 && __idx_ <= 5; }
};
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator==(const weekday_indexed& __lhs, const weekday_indexed& __rhs) noexcept
{ return __lhs.weekday() == __rhs.weekday() && __lhs.index() == __rhs.index(); }
class weekday_last {
private:
chrono::weekday __wd_;
public:
_LIBCPP_HIDE_FROM_ABI explicit constexpr weekday_last(const chrono::weekday& __val) noexcept
: __wd_{__val} {}
_LIBCPP_HIDE_FROM_ABI constexpr chrono::weekday weekday() const noexcept { return __wd_; }
_LIBCPP_HIDE_FROM_ABI constexpr bool ok() const noexcept { return __wd_.ok(); }
};
_LIBCPP_HIDE_FROM_ABI inline constexpr
bool operator==(const weekday_last& __lhs, const weekday_last& __rhs) noexcept
{ return __lhs.weekday() == __rhs.weekday(); }
_LIBCPP_HIDE_FROM_ABI inline constexpr
weekday_indexed weekday::operator[](unsigned __index) const noexcept { return weekday_indexed{*this, __index}; }
_LIBCPP_HIDE_FROM_ABI inline constexpr
weekday_last weekday::operator[](last_spec) const noexcept { return weekday_last{*this}; }
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};
} // namespace chrono
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 20
#endif // _LIBCPP___CHRONO_WEEKDAY_H
|
