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Author SHA1 Message Date
Louis Dionne 1e628d0c14 [libc++] Do not enable P1951 before C++23, since it's a breaking change 
In reaction to the issues raised by Richard in https://llvm.org/D109066,
this commit does not apply P1951 as a DR in previous standard modes,
since it breaks valid code.

I do believe it should be applied as a DR, however ideally we'd get some
sort of statement from the Committee to this effect (and all implementations
would behave consistently). In the meantime, only implement P1951 starting
with C++23 -- we can always come back and apply it as a DR if that's what
the Committee says.

Differential Revision: https://reviews.llvm.org/D110347
 2021-09-27 17:06:44 -04:00
Kent Ross f4abdb0c07 [libc++][spaceship] Implement std::pair::operator<=> 
Implements parts of P1614, including synth-three-way and three way comparison for std::pair.

Reviewed By: #libc, Quuxplusone, Mordante

Differential Revision: https://reviews.llvm.org/D107721
 2021-09-22 22:36:46 -07:00
Louis Dionne 312ad74aea [libc++] Implement P1951, default arguments for pair's forwarding constructor 
Differential Revision: https://reviews.llvm.org/D109066
 2021-09-09 08:28:22 -04:00
Louis Dionne 3557c7c122 [libc++] Remove workarounds for [[nodebug]] not working properly on typedefs in older Clangs 
Clang used to support [[nodebug]] everywhere except on typedefs. Since
we don't support such old Clangs anymore, we can get rid of _LIBCPP_NODEBUG_TYPE
in favour of always using _LIBCPP_NODEBUG.

Differential Revision: https://reviews.llvm.org/D108996
 2021-09-01 10:51:09 -04:00
Louis Dionne 8f9cc3bc29 [libc++][NFC] Use std::enable_if instead of _EnableB helper in pair 
This doesn't impact the compile-time efficiency, but we get better
diagnostics when an overload is disabled.
 2021-09-01 10:48:09 -04:00
Louis Dionne 64184b4af0 [libc++][NFC] Remove useless _LIBCPP_PUSH_MACROS 
Only files that actually use min/max are required to do this dance.

Differential Revision: https://reviews.llvm.org/D108778
 2021-08-27 12:41:55 -04:00
Louis Dionne 0166690401 [libc++] Remove workarounds for the lack of deduction guides in C++17 
All supported compilers have supported deduction guides in C++17 for a
while, so this isn't necessary anymore.

Differential Revision: https://reviews.llvm.org/D108213
 2021-08-18 08:57:25 -04:00
Christopher Di Bella 69d5a66621 [libcxx][modularisation] splits `<utility>` into self-contained headers 
* moves `std::hash` and `std::unary_function` into `__functional`
* Everything else goes into `__utility/${NAME}.h`

Differential Revision: https://reviews.llvm.org/D104002
 2021-06-25 00:29:01 +00:00