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[libc++][chono] Use hidden friends for leap_second comparison. #104713

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Aug 20, 2024
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[libc++][chono] Use hidden friends for leap_second comparison. #104713

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[libc++][chono] Use hidden friends for leap_second comparison.
mordante Aug 18, 2024
e5822ee
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mordante Aug 20, 2024
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1 change: 1 addition & 0 deletions libcxx/docs/Status/Cxx2cIssues.csv
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Original file line number Diff line number Diff line change
Expand Up @@ -77,4 +77,5 @@
"`LWG4106 <https://wg21.link/LWG4106>`__","``basic_format_args`` should not be default-constructible","2024-06 (St. Louis)","|Complete|","19.0","|format|"
"","","","","",""
"`LWG3343 <https://wg21.link/LWG3343>`__","Ordering of calls to ``unlock()`` and ``notify_all()`` in Effects element of ``notify_all_at_thread_exit()`` should be reversed","Not Adopted Yet","|Complete|","16.0",""
"`LWG3343 <https://wg21.link/LWG3343>`__","§[time.zone.leap] recursive constraint in <=>","Not Adopted Yet","|Complete|","20.0",""
"","","","","",""
131 changes: 68 additions & 63 deletions libcxx/include/__chrono/leap_second.h
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Original file line number Diff line number Diff line change
Expand Up @@ -50,70 +50,75 @@ class leap_second {
private:
sys_seconds __date_;
seconds __value_;
};

_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const leap_second& __x, const leap_second& __y) {
return __x.date() == __y.date();
}

_LIBCPP_HIDE_FROM_ABI inline constexpr strong_ordering operator<=>(const leap_second& __x, const leap_second& __y) {
return __x.date() <=> __y.date();
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() == __y;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() < __y;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const sys_time<_Duration>& __x, const leap_second& __y) {
return __x < __y.date();
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const leap_second& __x, const sys_time<_Duration>& __y) {
return __y < __x;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const sys_time<_Duration>& __x, const leap_second& __y) {
return __y < __x;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const leap_second& __x, const sys_time<_Duration>& __y) {
return !(__y < __x);
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const sys_time<_Duration>& __x, const leap_second& __y) {
return !(__y < __x);
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const leap_second& __x, const sys_time<_Duration>& __y) {
return !(__x < __y);
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const sys_time<_Duration>& __x, const leap_second& __y) {
return !(__x < __y);
}

# ifndef _LIBCPP_COMPILER_GCC
// This requirement cause a compilation loop in GCC-13 and running out of memory.
// TODO TZDB Test whether GCC-14 fixes this.
template <class _Duration>
requires three_way_comparable_with<sys_seconds, sys_time<_Duration>>
_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() <=> __y;
}
# endif
// The function
// template<class Duration>
// requires three_way_comparable_with<sys_seconds, sys_time<Duration>>
// constexpr auto operator<=>(const leap_second& x, const sys_time<Duration>& y) noexcept;
//
// Has constraints that are recursive (LWG4139). The proposed resolution is
// to make the funcion a hidden friend. For consistency make this change for
// all comparison functions.

_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const leap_second& __x, const leap_second& __y) {
return __x.date() == __y.date();
}

_LIBCPP_HIDE_FROM_ABI friend constexpr strong_ordering operator<=>(const leap_second& __x, const leap_second& __y) {
return __x.date() <=> __y.date();
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() == __y;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() < __y;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<(const sys_time<_Duration>& __x, const leap_second& __y) {
return __x < __y.date();
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>(const leap_second& __x, const sys_time<_Duration>& __y) {
return __y < __x;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>(const sys_time<_Duration>& __x, const leap_second& __y) {
return __y < __x;
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<=(const leap_second& __x, const sys_time<_Duration>& __y) {
return !(__y < __x);
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<=(const sys_time<_Duration>& __x, const leap_second& __y) {
return !(__y < __x);
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>=(const leap_second& __x, const sys_time<_Duration>& __y) {
return !(__x < __y);
}

template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>=(const sys_time<_Duration>& __x, const leap_second& __y) {
return !(__x < __y);
}

template <class _Duration>
requires three_way_comparable_with<sys_seconds, sys_time<_Duration>>
_LIBCPP_HIDE_FROM_ABI friend constexpr auto operator<=>(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() <=> __y;
}
};

} // namespace chrono

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