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Emmett 286fcce7e7
[libc++][chrono] Implement LWG 4274: Allow chrono::hh_mm_ss to be constructed from unsigned durations (#209686) 
**_Implementation details_**:
- Use `is_unsigned_v` instead of `numeric_limits<Rep>::is_signed`, which
is used by `chrono::abs`. `numeric_limits<Rep>::is_signed` may return
false when a custom `Rep` does not specialize `numeric_limits`. Relying
on it to detect the unsigned case could therefore be unreliable for such
a type. `is_unsigned_v` instead gives a compile-time path for built-in
unsigned types, while the sign check keeps signed types correct.

- The constructor calls `__abs_d` four times because each member is
initialized separately. This should not affect runtime performance
because the compiler should inline `__abs_d` and eliminate the repeated
calculations. We could use another helper function or helper class to
explicitly compute the absolute duration only once. However, this would
add extra glue code, and the added complexity is not worthwhile I think.

---------

Co-authored-by: A. Jiang <de34@live.cn>
2026-07-27 00:09:16 +08:00
..
__algorithm [libc++][pstl] Implementation of a parallel std::mismatch() based on __pstl::__parallel_find() (#209291) 2026-07-26 22:51:39 +08:00
__atomic [libc++] Implement P0493R5: Atomic minimum/maximum (#180333) 2026-07-21 19:41:49 +08:00
__bit [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__charconv [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__chrono [libc++][chrono] Implement LWG 4274: Allow chrono::hh_mm_ss to be constructed from unsigned durations (#209686) 2026-07-27 00:09:16 +08:00
__compare [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__concepts [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__condition_variable [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__configuration [libc++] Don't add #pragma clang attribute with GCC (#206989) 2026-07-22 17:46:13 +02:00
__coroutine
__cstddef [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__cxx03 [libc++] Rename the macro for the LLVM 18 ABI tag used in ranges (#208464) 2026-07-10 10:33:36 +02:00
__debug_utils [libc++] Honor __SANITIZER_DISABLE_CONTAINER_OVERFLOW__ in libc++ (#168955) 2026-01-27 16:04:03 +00:00
__exception [libc++] Add MSVC's implementation of exception_ptr for Windows (#94977) 2026-07-10 11:26:24 -07:00
__expected [libc++] Resolve LWG4366: Heterogeneous comparison of expected may be ill-formed (#185342) 2026-07-01 14:49:31 +08:00
__filesystem [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__flat_map [libc++][NFC] Remove unused __key_equiv from flat_multimap and flat_multiset (#175612) 2026-01-13 10:37:24 +01:00
__flat_set [libc++][NFC] Remove unused __key_equiv from flat_multimap and flat_multiset (#175612) 2026-01-13 10:37:24 +01:00
__format [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__functional [libc++] Implement std::function_ref (#186692) 2026-07-25 17:44:55 +01:00
__fwd [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__ios [libc++] Revert undesired [[nodiscard]] added to conversion functions (#173658) 2026-01-08 13:32:11 +08:00
__iterator [libc++][NFC] Remove unused includes from <__iterator/segmented_iterator.h> (#209105) 2026-07-13 14:56:38 +02:00
__locale_dir [libcxx][NFC] Move guards outside namespace (#208089) 2026-07-08 14:06:18 +00:00
__math [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__mdspan [libc++] Backport P3029R1 Better mdspan's CTAD to C++20/23 (#208132) 2026-07-13 22:38:17 +08:00
__memory [libc++][unique_ptr] Implement LWG 4144: Disallow unique_ptr<T&, D> (#209018) 2026-07-13 21:39:06 +03:00
__memory_resource [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__mutex [libc++][ThreadSafety] Add thread safety annotations for variadic std::scoped_lock (#204462) 2026-07-07 17:52:56 +02:00
__new [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__numeric [libc++][pstl] Default implementation of parallel std::adjacent_difference (#207585) 2026-07-21 07:42:26 -04:00
__ostream [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__pstl [libc++][pstl] Implementation of a parallel std::mismatch() based on __pstl::__parallel_find() (#209291) 2026-07-26 22:51:39 +08:00
__random [libc++] Add an ABI flag to optimize mersenne_twister_engine (#206423) 2026-07-05 19:40:43 +02:00
__ranges [libc++][ranges][NFC] Format lazy_split_view (#210644) 2026-07-20 12:23:06 +03:00
__stop_token [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__string [libc++] Refactor __libcpp_is_trivially_equality_comparable to be a variable template (#173151) 2025-12-22 10:04:47 +01:00
__support [libc++] Port The OpenBSD localization to the new locale API (#194317) 2026-05-19 12:41:42 +02:00
__system_error [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__thread [libc++] Add missing include to thread.h (#208740) 2026-07-13 10:53:07 -04:00
__tuple [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__type_traits [libc++] Implement std::function_ref (#186692) 2026-07-25 17:44:55 +01:00
__utility [libc++][cmp][NFC] Fix: Empty namespaces should be avoided (#210624) 2026-07-20 05:47:58 +03:00
__variant [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
__vector [libc++] Don't require complete types in vector<T>::empty() (#210754) 2026-07-21 10:21:27 -04:00
experimental [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
ext [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
__assert [libc++] Remove full header path from assertion messages (#190060) 2026-04-25 07:01:30 -04:00
__bit_reference [libc++] Treat negative counts in copy_n & friends as no-ops (#207086) 2026-07-15 13:24:03 -04:00
__config Bump version to 24.0.0git (#209473) 2026-07-14 09:21:03 -04:00
__config_site.in [libc++] Add CMake plumbing for _LIBCPP_HAS_THREAD_API_C11 mode. (#188414) 2026-03-25 10:51:31 -07:00
__hash_table [libc++] Fix exception safety of __hash_table::__copy_construct (avoid memory leak) (#201452) 2026-06-10 09:05:56 +02:00
__locale [libc++] Don't make libc++ headers system headers in the modulemap (#205509) 2026-07-01 14:52:50 +02:00
__log_hardening_failure [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__mbstate_t.h [libc++] Allow building libc++ using llvm-libc without locale support (#187603) 2026-04-29 13:06:14 -07:00
__node_handle [libc++] Make <set> std::set constexpr as part of P3372R3 (#167241) 2026-07-01 07:20:25 +08:00
__split_buffer [libc++] Add a size-based representation for vector in the unstable ABI (#155330) 2026-07-01 15:12:36 -04:00
__std_mbstate_t.h
__tree [libc++] Make <set> std::set constexpr as part of P3372R3 (#167241) 2026-07-01 07:20:25 +08:00
__undef_macros
__verbose_abort [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
__verbose_trap [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
algorithm [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
any [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
array [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
atomic [libc++] Implement P0493R5: Atomic minimum/maximum (#180333) 2026-07-21 19:41:49 +08:00
barrier [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
bit [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
bitset [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
cassert
ccomplex
cctype [libc++] Remove libc++'s own ctype.h (#194615) 2026-05-04 08:28:24 +02:00
cerrno
cfenv [libc++] Remove libc++'s own fenv.h (#194629) 2026-05-04 08:28:45 +02:00
cfloat [libc++] Remove libc++'s <float.h> (#175849) 2026-01-19 15:12:40 -05:00
charconv [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
chrono [libc++][chrono] Implement LWG 4481: Disallow chrono::duration<const T, P> (#207558) 2026-07-08 16:59:53 +08:00
cinttypes [libc++] Remove libc++'s own inttypes.h (#193716) 2026-04-30 11:00:29 +02:00
ciso646
climits
clocale
CMakeLists.txt [libc++][pstl] Implementation of a parallel std::mismatch() based on __pstl::__parallel_find() (#209291) 2026-07-26 22:51:39 +08:00
cmath [libc++][math] Add constexpr to std::fpclassify (#210993) 2026-07-26 14:30:25 +08:00
codecvt [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
compare [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
complex [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
complex.h
concepts [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
condition_variable [libc++] Remove <atomic> includes from <stop_token> (#201710) 2026-06-08 09:48:22 +02:00
coroutine [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
csetjmp
csignal
cstdalign
cstdarg
cstdbool
cstddef
cstdint
cstdio
cstdlib
cstring
ctgmath
ctime
cuchar [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
cwchar [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
cwctype
deque [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
errno.h
exception [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
execution [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
expected
filesystem [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
flat_map [libc++] Implement P3567R2 flat_meow fixes (#162022) 2025-12-20 21:18:44 +00:00
flat_set [libc++] Implement P3567R2 flat_meow fixes (#162022) 2025-12-20 21:18:44 +00:00
format [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
forward_list [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
fstream [libc++][NFC] Inline fstream functions into the class body (#211738) 2026-07-26 17:46:14 +02:00
functional [libc++] Implement std::function_ref (#186692) 2026-07-25 17:44:55 +01:00
future [libc++] Use _LIBCPP_KEEP_TRANSITIVE_INCLUDES_LLVM23 in <future> (#207668) 2026-07-06 12:36:19 +02:00
initializer_list [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
iomanip [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
ios [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
iosfwd
iostream
istream [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
iterator [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
latch [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
limits [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
list [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
locale [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
map [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
math.h [libc++][math] Add constexpr to std::fpclassify (#210993) 2026-07-26 14:30:25 +08:00
mdspan [libc++] Backport P3029R1 Better mdspan's CTAD to C++20/23 (#208132) 2026-07-13 22:38:17 +08:00
memory [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
memory_resource [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
module.modulemap.in [libc++][pstl] Implementation of a parallel std::mismatch() based on __pstl::__parallel_find() (#209291) 2026-07-26 22:51:39 +08:00
mutex [libc++][ThreadSafety] Add thread safety annotations for variadic std::scoped_lock (#204462) 2026-07-07 17:52:56 +02:00
new [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
numbers [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
numeric [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
optional [libc++] Strengthen optional value constructor noexcept (#202765) 2026-06-16 09:06:36 -07:00
ostream [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
print [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
queue [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
random [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
ranges [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
ratio [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
regex [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
scoped_allocator [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
semaphore [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
set [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
shared_mutex [libc++][ThreadSafety] Add thread safety annotations for variadic std::scoped_lock (#204462) 2026-07-07 17:52:56 +02:00
source_location [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
span [libc++] Backport P3029R1 Better mdspan's CTAD to C++20/23 (#208132) 2026-07-13 22:38:17 +08:00
sstream [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
stack [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
stdatomic.h [libc++] "Always" include_next for non C++ path in stdatomic.h (#178463) 2026-01-30 10:01:51 -05:00
stddef.h
stdexcept [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
stdio.h
stdlib.h
stop_token [libc++] Remove <atomic> includes from <stop_token> (#201710) 2026-06-08 09:48:22 +02:00
streambuf [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
string [libc++] Base string's alignment on __STDCPP_DEFAULT_NEW_ALIGNMENT__ (#171785) 2026-07-03 07:11:04 +02:00
string.h [libc++] Add a missing include in string.h (#135134) 2026-06-19 10:20:30 -04:00
string_view [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
strstream [libc++] Introduce implicit and explicit ABI annotations (#193045) 2026-05-08 12:21:31 +02:00
syncstream [libc++] Don't make libc++ headers system headers in the modulemap (#205509) 2026-07-01 14:52:50 +02:00
system_error [libc++][NFC] Fix synopsis comment for error_condition::message() (#210724) 2026-07-21 07:22:59 -04:00
text_encoding [libc++] Implement P1885R12: <text_encoding> (#141312) 2026-06-25 07:46:11 +08:00
tgmath.h
thread [libc++] Use std::to_chars to format thread::id and canonicalize the representation across platforms (#181624) 2026-07-05 19:36:39 +02:00
tuple [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
type_traits
typeindex [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
typeinfo [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
uchar.h
unordered_map [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
unordered_set [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
utility [libc++] Implement P4206R0 Revert string support in std::constant_wrapper (#203338) 2026-06-23 01:17:53 +08:00
valarray [libc++] Drop transitive includes by default (#195509) 2026-06-05 09:45:49 +02:00
variant [libc++] Consistently use version guards outside namespace macros (#181136) 2026-06-29 14:44:44 +02:00
vector [libc++] Enable missing allocator constructors in C++11 (#204845) 2026-07-10 07:46:26 +08:00
version [libc++] Implement std::function_ref (#186692) 2026-07-25 17:44:55 +01:00
wchar.h [libc++] Assume that <wchar.h> in llvm-libc has const-overloads. (#206805) 2026-07-01 08:09:53 -07:00
wctype.h