[libc++][NFC] Mark P1424R1 as partially implemented

[H-G-Hristov]

hh_mm_ss and related functions from https://wg21.link/P1466R3 was partially implemented in LLVM 10 fde236b

// 27.9, class template time_of_dayhh_mm_ss
template <class Duration> hh_mm_ss;

// 27.10, 12/24 hour functions
constexpr bool is_am(const hours& h) noexcept;
constexpr bool is_pm(const hours& h) noexcept;
constexpr hours make12(const hours& h) noexcept;
constexpr hours make24(const hours& h, bool is_pm) noexcept;

Accessors added in db99d3a (operator << is not implemented)

Modify 27.8.6.2 [time.cal.wd.members] as indicated:

constexpr explicit weekday(unsigned wd) noexcept;
Effects: Constructs an object of type weekday by initializing wd_ with wd == 7 ? 0 : wd. The value held is unspecified if wd is not in the range [0, 255].

constexpr explicit operator unsigned() const noexcept;
Returns: wd_.

constexpr unsigned c_encoding() const noexcept;
Returns: wd_.

constexpr unsigned iso_encoding() const noexcept;
Returns: wd_ == 0u ? 7u : wd_.

Modify 27.8.6.3 [time.cal.wd.nonmembers] as indicated:

constexpr bool operator==(const weekday& x, const weekday& y) noexcept;
Returns: unsigned{x} == unsigned{y} x.wd_ == y.wd_.

constexpr weekday operator+(const weekday& x, const days& y) noexcept;
Returns: weekday{modulo(static_cast<long long>(unsigned{x.wd_}) + y.count(), 7)}.

template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const weekday& wd);
Effects: If wd.ok() == true inserts format(os.getloc(), fmt, wd) where fmt is "%a" widened to charT. Otherwise inserts unsigned{wd.wd_} << " is not a valid weekday".

Reference:

• GitHub issue: P1466R3: Miscellaneous minor fixes for chrono #100015
• Phabricator review: https://reviews.llvm.org/D65365

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Hristo Hristov (H-G-Hristov)

Changes

hh_mm_ss and related functions from https://wg21.link/P1466R3 was partially implemented in LLVM 10

Reference: #100015

---

Full diff: https://github.com/llvm/llvm-project/pull/107751.diff

1 Files Affected:

• (modified) libcxx/docs/Status/Cxx20Papers.csv (+1-1)

diff --git a/libcxx/docs/Status/Cxx20Papers.csv b/libcxx/docs/Status/Cxx20Papers.csv
index ad788d7416fdad..721bf9d69a3a45 100644
--- a/libcxx/docs/Status/Cxx20Papers.csv
+++ b/libcxx/docs/Status/Cxx20Papers.csv
@@ -118,7 +118,7 @@
 "`P1361R2 <https://wg21.link/P1361R2>`__","Integration of chrono with text formatting","2019-07 (Cologne)","|Partial|","",""
 "`P1423R3 <https://wg21.link/P1423R3>`__","char8_t backward compatibility remediation","2019-07 (Cologne)","|Complete|","15.0",""
 "`P1424R1 <https://wg21.link/P1424R1>`__","'constexpr' feature macro concerns","2019-07 (Cologne)","|Nothing To Do|","","Superseded by `P1902 <https://wg21.link/P1902>`__"
-"`P1466R3 <https://wg21.link/P1466R3>`__","Miscellaneous minor fixes for chrono","2019-07 (Cologne)","","",""
+"`P1466R3 <https://wg21.link/P1466R3>`__","Miscellaneous minor fixes for chrono","2019-07 (Cologne)","|Partial|","","`hh_mm_ss` implemented in LLVM 10"
 "`P1474R1 <https://wg21.link/P1474R1>`__","Helpful pointers for ContiguousIterator","2019-07 (Cologne)","|Complete|","15.0",""
 "`P1502R1 <https://wg21.link/P1502R1>`__","Standard library header units for C++20","2019-07 (Cologne)","","",""
 "`P1522R1 <https://wg21.link/P1522R1>`__","Iterator Difference Type and Integer Overflow","2019-07 (Cologne)","|Complete|","15.0",""

[Zingam]

Should I update the #100015 with subtasks what's implemented and what remains to be done?

[ldionne]

Should I update the #100015 with subtasks what's implemented and what remains to be done?

That would be amazing!

[Zingam]

Should I update the #100015 with subtasks what's implemented and what remains to be done?

That would be amazing!

Thanks. I am working on it. I think it's enough for now to mark P1424R1 as partially implemented with this PR.